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  • Articles  (3,315)
  • Ecology  (3,315)
  • 2020-2022  (3,315)
  • 1
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    Kent estuary survey 18th August 1981 (2021)
    North West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11098 | 1256 | 2013-04-03 15:27:57 | 11098 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: This is the Kent estuary survey 18th July 1981 produced by the North West Water Authority in 1981. The report focuses on a tidal cycle survey carried out on the Kent estuary on the 18th August, 1981. The chemical water quality at Arnside Pier and at New Barns was, on the whole, acceptable. However, samples taken downstream of the outfall at low water for total coliforms and E. coli were all above the EEC mandatory level whilst those for faecal streptococci were all above the guideline value. This document shows chemical and bacteriological data analysed at Kent estuary such chloride, dissolved oxygen, BOD, ammonia, nitrate, phosphate, total coliforms, E. coli and Faecal streptococci.
    Description: Environment Agency Archives North West
    Description: + appendices
    Keywords: Ecology ; Limnology ; Management ; England ; Kent estuary ; Arnside ; Inland waters ; Estuary ; Environmental survey ; Water quality ; Environmental assessment ; Bathing waters
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 18
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  • 2
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    River Eden RHS and geomorphology evaluation. Final report October 2001 (2021)
    Environment Agency | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11096 | 1256 | 2013-04-03 15:31:02 | 11096 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: This is the River Eden RHS and geomorphology evaluation: Final report October 2001 produced by the Environment Agency North West in 2001. This report analysed the River Habitat Survey (RHS) and geomorphology data to evaluate the level of habitat quality and the geomorphological characteristics of the River Eden and sub-catchments. RHS data and geomorphological assessment data was collected within the study areas by CEH and Fluvial Environmental Services Ltd. The River Eden and its sub-catchments are being considered as a Special Area for Conservation (SAC) due to the presence of habitat types and species, which are rare or threatened within Europe. The purpose of the project is to provide an overview of the state of the catchment in terms of river habitats and geomorphological processes in order to aid the derivation of sound management for this proposed SAC.The aim of this report was to determine the state of the environment within the Eden and sub-catchments and identify the main pressures on the system in order to derive sound management options.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Limnology ; Management ; England ; River Eden ; Inland waters ; Rivers ; RHS ; Environmental assessment ; Water quality ; Nature conservation ; Eden Rivers Trust ; English Nature
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 133
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  • 3
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    Report on fisheries invertebrate survey of the Groove Beck,Thornsgill Beck,Troutbeck system (2021)
    Environment Agency North West | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11101 | 1256 | 2013-04-03 15:27:14 | 11101 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: This is the Report on fisheries invertebrate survey of the Groove Beck, Thornsgill Beck and Troutbeck system produced by the Environment Agency North West in 1997. In 1996 the National Rivers Authority (NRA) report on the 1992 strategic stock assessment for the Upper Derwent catchment Jane Atkins recommended that should subsequent electrofishing show continued low densities, a survey of the invertebrate fauna should be undertaken to assess the food availability for salmonids, in order that lack of food could be ruled out as a contributory factor in their poor breeding success. Additionally the survey looked at the substrate to try to determine whether the bed type might actually be unsuitable for spawning, especially in view of the previously mentioned silt inputs.
    Description: Environment Agency Archives North West
    Description: + tables
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Groove Beck ; Thornsgill Beck ; Trout Beck ; Inland waters ; Rivers ; Environmental survey ; Freshwater fishes ; Migratory species ; Invertebrate larvae
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 4
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  • 4
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    Report of 1996 survey of Trout Beck with particular reference to spawning gravel quality and invertebrates as a food source for salmonids (2021)
    Environment Agency | Carlisle, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11100 | 1256 | 2013-04-03 15:27:32 | 11100 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: This is the Report of 1996 survey of Trout Beck with particular reference to spawning gravel quality and invertebrates as a food source for salmonids produced by the Environment Agency North West. Whilst the main River Derwent is quite a high profile salmon fishery, Trout Beck is not a significant fishery in its own right, but serves to maintain the genetic integrity of the wild populations of trout and salmon in the catchment by providing a unique habitat. This survey addressed the invertebrate food availability, and additionally looked at the substrate to try to determine whether the bed type might actually be unsuitable for spawning, especially in view of the previously mentioned silt inputs.
    Description: Environment Agency Archives North West
    Description: + 1 map and 1 figure
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Trout Beck ; Inland waters ; Rivers ; Environmental survey ; Freshwater fishes ; Migratory species ; Invertebrate larvae
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 8
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  • 5
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    Ashburn (Dart catchment) fisheries survey 1978 (2021)
    Unpublished | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11141 | 1256 | 2013-04-11 16:54:17 | 11141 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: This is the Ashburn (Dart catchment) fisheries survey 1978 report produced by South West Water Authority in 1978. This report focuses on an exploratory survey to determine the population and distribution of all fish species and in particular salmonid species of the Ashburn stream. This survey is primarily intended for future reference on completion of the proposed Flood Alleviation Scheme of the Ashburn where it passes through the centre of Ashburton. Three sections were electro fished using D.C. Current Sections were chosen as easily accessible and through their relation in position to the intended scheme.
    Description: Environment Agency Archives South West
    Description: + map
    Keywords: Ecology ; Fisheries ; Limnology ; England ; River Dart catchment ; Ashburn stream ; Inland waters ; Freshwater fish ; Migratory species ; Fish population ; Population size distribution ; Fish catch statistics ; Fishery data ; Fishery surveys
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 5
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  • 6
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    Biological survey: River Teign and tributaries with references to the discharge of ball clay wastes (2021)
    South West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11139 | 1256 | 2013-04-11 16:54:51 | 11139 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: This is the Biological survey of River Teign and tributaries with references to the discharge of ball clay wastes, document produced by South West Water Authority in 1973. This report focuses on on-site assessment of the benthic macro-invertebrates of the lower River Teign, River Bovey, Ugbrooke Stream and Blatchford Brook was undertaken on 19th and 22nd August 1977 to assess the effects of discharges from ball clay mining premises. Inspection of aquatic fauna in the field is of necessity, less extensive than laboratory identification of sorted samples, so that the resulting data underestimates the water quality. This is more pronounced in the Chandler Score than in the Trent Biotic Index which does not take account of species abundance. Chandler should thus be interpreted by the trends described rather than by absolute values calculated.
    Description: Environment Agency Archives South West
    Description: + tables and maps
    Keywords: Ecology ; Limnology ; Pollution ; England ; River Teign ; Inland waters ; Invertebrates ; Environmental assessment ; Freshwater pollution ; Water quality ; Fishery surveys
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 2
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  • 7
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    Biological survey of the River Teign and tributaries, with reference to the effect of ball clay discharges (2021)
    South West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11145 | 1256 | 2013-04-11 16:53:46 | 11145 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: This is the Biological survey of the River Teign and tributaries, with reference to the effect of ball clay discharges report produced by South West Water Authority in 1979. A survey of the macroinvertebrate riffle fauna in the Ball Clay mining area of the Bovey Basin, following a period of low rainfall, indicated that the River Bovey and the River Teign between Chudleigh and Teign Bridge, Newton Abbot were of good quality. Further downstream, the R. Teign and the lower reaches of the Ugbrooke Stream were identified as being of doubtful quality with the discharge from ECC Broadway continuing to give cause for concern.
    Description: Environment Agency Archives South West
    Description: + tables, figures and appendices
    Keywords: Ecology ; Fisheries ; Limnology ; England ; River Teign catchment ; Inland waters ; Fishery surveys ; Invertebrate larvae ; Freshwater pollution ; Water quality
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 5
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  • 8
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    Glossoma intermedium survey. Scotland, April 5th to April 10th 2012 (2021)
    Riverfly Partnership | London, UK
    In:  http://aquaticcommons.org/id/eprint/11162 | 1256 | 2013-04-23 18:33:59 | 11162 | Freshwater Biological Association
    Details
    Publication Date: 2021-06-28
    Description: The British Glossomatidae contains seven species, split between the genera Glossosoma, Agapetus and Synagapetus. One species, Glossosoma intermediumhas not been recorded in England since 2003. This was found in a side stream of Hayeswater gill in the Lake District. The main purpose of this survey was to try and locate and record Glossosoma intermedium and was a follow up to a similar survey we carried out in the Glennshee area of Scotland during April 2011. Additionally, as in the 2011 survey it also made sense that while looking for the larvae, pupae and adults of Glossosoma intermediumwe could also record other species of caddisfly (Trichoptera), mayfly (Ephemeroptera) and stonefly (Plecoptera).
    Keywords: Ecology ; Limnology ; Scotland ; New records ; Trichoptera ; Biological sampling ; Trichoptera ; Freshwater surveys ; Taxonomy
    Repository Name: AquaDocs
    Type: book , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 1-15
    Format: 6
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  • 9
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    Eighth Deep-Sea Biology Symposium, Monterey, California 1997: abstracts (2021)
    Monterey Bay Aquarium Research Institute | Monterey, CA
    In:  http://aquaticcommons.org/id/eprint/10614 | 8 | 2015-04-29 21:11:23 | 10614
    Details
    Publication Date: 2021-06-27
    Keywords: Biology ; Ecology
    Repository Name: AquaDocs
    Type: book
    Format: application/pdf
    Format: application/pdf
    Format: 161
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  • 10
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    The Coleopteran fauna of exposed riverine sediments on the River Dane, Cheshire: A survey report (2021)
    Environment Agency | Birmingham, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10615 | 1256 | 2013-04-03 15:24:53 | 10615 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: This is the Coleopteran Fauna of ERS on the river Dane, Cheshire: a survey report produced by the Environment Agency in 2003. A comprehensive survey of the Exposed Riverine Sediment (ERS) on the River Dane, Cheshire was undertaken between mid-April and mid-June 2003. 6 locations were selected and subsequently examined to determine the importance of the constituent invertebrate fauna. Appropriate sampling techniques (i.e. pitfall trapping, hand searching and excavations) were directed towards the target group (Coleoptera). All adults from the chosen taxa were identified to species level. The relative value of the fauna was assessed using species richness, conservation status, fidelity score and a site quality index.
    Description: Environment Agency Archives North West
    Description: + appendices
    Keywords: Ecology ; Limnology ; England ; Cheshire ; River Dane ; Inland waters ; Rivers ; Freshwater fishes ; Invertebrate larvae ; ERS ; Environmental assessment ; Water quality ; Species richness ; Conservation status ; Fidelity score ; Site Quality Index
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 29
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  • 11
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    Survey of the lesser silver water beetle Hydrochara caraboides in Cheshire (2021)
    English Nature | Shropshire, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10617 | 1256 | 2013-03-29 14:22:02 | 10617 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: This is the report on the Survey of the Lesser Silver Water Beetle Hydrochara caraboides in Cheshire 1997 by the English Nature Research Reports. The three surveyed areas were the ponds at Reaseheath, Mickle Trafford and Brookhouse Farm.The report goes through the method of survey and individual results for each location/pond, aspects of the breeding sites considered favourable to Hydrochara caraboides as depth, vegetation, predators and prey species, surrounding land. It comes with suggestions for further work and appendixes. Appendix A contains tabulated lists of plants and invertebrates found in the various ponds, Appendix B shows grid references and a brief description of ponds at Brookhouse Farm, pond diagrams are plotted in Appendix C.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Limnology ; England ; Reaseheath ; Mickle Trafford ; Brookhouse Farm ; Hydrochara caraboides ; Silver water beetle ; Pond ; Survey ; Breeding sites ; Sampling
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 28
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  • 12
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    Additional crayfish survey of Checkley Brook, Hollywood End Brook and Black Brook (Goyt) 1999 (2021)
    Environment Agency | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10619 | 1256 | 2013-03-29 14:19:49 | 10619 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: This is the report on the Additonal Crayfish Survey of Checkley Brook, Hollywood End Brook and Black Brook from 1999 by the Environment agency. The aim of the 1999 survey was to obtain a more complete picture of the crayfish distribution in those areas.It contains sections on the sampling methodology which followed the sampling done in 1998, the results of the sampling indicating the species of crayfish occurring in the sampling areas and some discussion and conclusions for each area. The appendix I contains maps locating the sampling points and past records. The appendix II contains detailed information of the sampling points.
    Description: Environment Agency Archives North West
    Description: + appendices
    Keywords: Ecology ; Environment ; Limnology ; England ; Checkley Brook ; Hollywood ; End Brook ; Black Brook ; Crayfish ; Survey ; Crayfish distribution ; Crayfish species ; Sampling
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 10
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  • 13
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    Visual survey of exposed riverine sediments (Ers) in the Dane, Weaver and Bollin catchments (2021)
    Environment Agency | Birmingham, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10616 | 1256 | 2013-04-03 15:24:38 | 10616 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: This is the Visual survey ERS Dane, Weaver & Bollin Catchments produced by the Environment Agency in 2005. Visual surveys of the River Dane downstream of the confluence with the Swettenham Brook, the River Weaver, and the River Bollin catchment in the EA Northwest South area of England were undertaken between 3rd and 9th February 2005 with the aim of identifying the spatial distribution and relative quality of exposed Riverine sediments (ERS). The potential value of these ERS in terms of likely habitat quality for ERS invertebrate communities was determined by recording a suite of appropriate environmental variables. Following an initial cartographical analysis of reaches likely to contain ERS, tens of kilometres of riverbank were inspected and 67 areas of ERS were selected for detailed visual survey. Site characteristics ranged widely both between and within catchments, with habitat quality ranging from poor to very high.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Limnology ; England ; Cheshire ; River Dane ; River Weaver ; River Bollin ; Inland waters ; Rivers ; Invertebrate larvae ; ERS ; Environmental assessment ; Water quality
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 63
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  • 14
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    Crayfish survey of the Weaver, Dane, Goyt and Etherow catchments (2021)
    Environment Agency | Manchester, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10618 | 1256 | 2013-03-29 14:19:31 | 10618 | Environment Agency, UK (Freshwater Biological Association)
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    Publication Date: 2021-06-27
    Description: This is the report on the Crayfish Survey of the Weaver, Dane, Goyt and Etherow catchments from 1998 by the Environment Agency. The aims of this report are: Firstly, to present the findings of the crayfishsurvey and details of the sites visited. Secondly to present the information on distribution maps with past records so that the current status can be seen and finally to use this information so that recommendations for the conservation of native crayfish can be made in accordance with the national action plan for this species and the Environment Agency’s Species Management Programme.The report contains sections on background, going through legislation, distribution and requirements of both native and non-native crayfish. Sections on methodology, results and discussion, conclusion and recommendations.The appendix I contains maps showing the sampling points locations. Details of sampling sites are summarized in appendix II. Appendix III contains previous crayfish records and Appendix IV shows the field data recording form. Finally, a collection of photographs are displayed in appendix V.
    Description: Environment Agency Archives North West
    Description: + appendices
    Keywords: Ecology ; Limnology ; Management ; England ; Weaver ; Dane ; Goyt ; Etherow ; Catchment ; Crayfish ; Survey ; Crayfish distribution ; Crayfish species ; Sampling
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 18
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  • 15
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    River Leith fluvial aufit. Final project report (2021)
    Lancaster University | Lancaster, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11094 | 1256 | 2013-03-29 14:14:20 | 11094 | Environment Agency, UK (Freshwater Biological Association)
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    Publication Date: 2021-06-27
    Description: This is the River Leith fluvial audit: Final project report produced by Lancaster University in 1998. Freeze cores extracted from the upper and lower ends of River Leith illustrate that the bed is highly compacted in the downstream reach. Fine material is locally derived from bedrock at depths of only 32 cms into the bed and in one core fine material is 66% of the extracted core. Levels of fines that are believed to be detrimental to fish are put at 20 to 30%. Reduced flow and stream power from water abstraction may lead to a greater infiltration of fine material if gravels are not regularly flushed through with flood flows. Infiltration of fine material can lead to river bed compaction and concretion. A small abstraction may have no effect on the morphology of a river if the reduced discharge is within the normal range of flows experienced. However if the impact on flows is small it is still possible that fine sediment problems will develop progressively and the effects may not be noticed for several years.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Limnology ; Management ; England ; River Leith ; Inland waters ; Rivers ; Freshwater fish ; Migratory species ; Sediment cores ; Fine material ; Pollution effects ; Environmental assessment ; Water quality
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 17
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  • 16
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    Kent estuary survey 8th July 1980 (2021)
    North West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11097 | 1256 | 2013-04-03 15:28:09 | 11097 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: This is the Kent estuary survey 8th July 1980 produced by the North West Water Authority in 1980. This survey was carried out on the Kent Estuary on the 8th July, 1980 during the period 3h hours before to 1.5 hours after low water. The chemical water quality in the vicinity of Arnside was found, in general, to be good. The E. coli counts were found to be at or below the E E C mandatory value for bathing waters. Downstream of the Arnside outfall the E coli counts were generally above the E E C mandatory value, the counts getting higher at and after low water. B O D values also increased at low water though ammonia and phosphate (except for 1 sample) concentrations were low. The total coliform counts both at Arnside and below the outfall were always above the E E C mandatory level (except for 2 samples).
    Description: Environment Agency Archives North West
    Description: + appendices
    Keywords: Ecology ; Limnology ; Management ; England ; Kent estuary ; Arnside ; Inland waters ; Estuary ; Environmental survey ; Water quality ; Environmental assessment ; Bathing waters
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 11
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  • 17
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    The Kent estuary 1992 surveys. Summary of results (2021)
    National Rivers Authority North West | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11099 | 1256 | 2013-04-03 15:27:43 | 11099 | Environment Agency, UK (Freshwater Biological Association)
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    Publication Date: 2021-06-28
    Description: This is the Kent estuary 1992 surveys: Summary of results produced by the National Rivers Authority in 1993. The report summarises routine and baseline water quality surveys carried out on the Kent estuary during 1992. Baseline surveys are designed to respond to regional, national, and European requirements. During 1992 baseline surveys were carried out in June and December. Unfortunately, in June, samples could only be taken from stations 3, 7 and 8. For ease of interpretation the results have been presented in graph form, including the maximum and minimum parameter concentration and the appropriate Environmental Quality Standards (EQS). The parameters measured in this survey were physical parameters (temperature, BOD, dissolved oxygen, Ph, salinity, conductivity); nutrients (ammonia, phosphate, and nitrate); metals (Mercury, Nickel, Arsenic, Cadmium, Chromium, Cooper, Boron, and Zinc) and organic compounds.
    Description: Environment Agency Archives North West
    Description: + tables, figures and appendices
    Keywords: Ecology ; Limnology ; Management ; England ; Kent estuary ; Arnside ; Estuary ; Coastal waters ; Environmental survey ; Water quality ; Environmental assessment ; Bathing waters ; EQS
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 2
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  • 18
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    Fish communities in rivers to be affected by Roadford Reservoir (2021)
    South West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11138 | 1256 | 2013-04-11 16:54:40 | 11138 | Environment Agency, UK (Freshwater Biological Association)
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    Publication Date: 2021-06-28
    Description: This is the Fish communities in rivers to be affected by Roadford Reservoir report produced by South West Water Authority in 1978. Surveys were carried, out on the Rivers Wolf, Thrushel, Lew and Lumburn, which are likely to be affected directly and indirectly by the construction and use of Roadford Reservoir. Of the upper reaches of three rivers to be affected directly by water releases, two were found to support abundant stocks of salmon and trout, and the third was found to contain abundant stocks of trout and eels. The River Thrushel will be affected indirectly and in this river salmon and trout stocks were present in slightly lower abundance than in others. Population estimates, densities, mean lengths and approximate biomass values were calculated. Other species were present in all rivers, usually in great abundance.
    Description: Environment Agency Archives South West
    Description: + tables and maps
    Keywords: Ecology ; Fisheries ; Limnology ; England ; River Teign ; Inland waters ; Freshwater fish ; Migratory species ; Fish population ; Population size distribution ; Fish catch statistics ; Fishery data ; Fishery surveys
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 6
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  • 19
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    River Bray fisheries survey 1978-80 (2021)
    South West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11148 | 1256 | 2013-04-11 16:53:15 | 11148 | Environment Agency, UK (Freshwater Biological Association)
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    Publication Date: 2021-06-28
    Description: This is the River Bray fisheries survey 1978-80 report produced by South West Water Authority in 1981. This report aims to assess the possible effects of new abstraction conditions at Leahamford on the fish communities of the River Bray, surveys have been carried out in 1978, 197S and 1980. Field work was done in August and September each; year. Abstraction began in summer 1979. On the River Bray one site upstream and three downstream of Leahamford were chosen. One site on the River Mole was surveyed and is considered as a control site, being not directly affected by abstraction. The sketch map shows these sites in relation to Leahamford.
    Description: Environment Agency Archives South West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; River Bray ; Inland waters ; Freshwater fish ; Migratory species ; Fish population ; Population size distribution ; Fish catch statistics ; Fishery data ; Fishery surveys
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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  • 20
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    Fisheries survey of the River Taw 1977 (2021)
    South West Water Authority | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11146 | 1256 | 2013-04-11 16:53:38 | 11146 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: This is the Fisheries survey of the River Taw 1977 report produced by South West Water Authority in 1978. The upper reaches of the River Taw were severely polluted in October 1975 and there was widespread fish mortality. A survey was carried out to assess the recovery of salmonid stocks in the affected areas. Salmon showed a rapid recovery and trout have also recovered well. Both species have been assisted by widespread stocking. Several other species were present. Salmonid and total fish biomass was high. Further stocking of salmon is not recommended and it is also suggested that stocking with trout should be discontinued.
    Description: Environment Agency Archives South West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; River Taw ; Inland waters ; Freshwater fish ; Migratory species ; Fish population ; Population size distribution ; Fish catch statistics ; Fishery data ; Fishery surveys ; Freshwater pollution
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
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  • 21
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    The Environment Agency/DEFRA Evidence and Measures Project: Practical Solutions - Moston Brook (2021)
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/11164 | 1256 | 2013-09-03 13:07:23 | 11164 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: This is the final presentation from the Moston Brook Evidence and Measures project which ran from September 2012 to March 2013. Moston Brook water body is part of the River Irwell Pilot Catchment and the objective of the project was to devise reliable measures (actions) which were based on existing evidence and that could be implemented in years 2 and 3 by the Environment Agency and its partner to help meet Water Framework Directive (WDF) requirements and community aspirations. The presentation summarises the main suspected causes of WDF failure, the evidence for this, the main causes for failure in the sub-catchments resulting from the evidence found, and identifies measures to carry out, which will address the WDF failures and improve the quality of the water. This presentation can be used to inform others on how to improve the water quality of Moston Brook, and also to support other similar initiatives.
    Description: Environment Agency Archives North West
    Description: Copy of 20 powerpoint slides in 10 page document.
    Keywords: Ecology ; Limnology ; Pollution ; UK ; England ; North West ; Rivers ; Environmental assessment ; Water management ; Freshwater pollution ; Water quality ; River Irwell ; water@leeds
    Repository Name: AquaDocs
    Type: conference_item , FALSE
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  • 22
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    Benthic marine Amphipoda of southern California: families Aoridae, Photidae, Ischyroceridae, Corophiidae, Podoceridae (2021)
    In:  library@mlml.calstate.edu | http://aquaticcommons.org/id/eprint/11193 | 8 | 2013-06-06 23:58:52 | 11193 | Beaudette Foundation for Biological Research
    Details
    Publication Date: 2021-06-29
    Keywords: Biology ; Ecology
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 3-72
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  • 23
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    The role of substrate, flow and larval supply to recruitment of the red abalone (Haliotis rufescens) (2021)
    University of California, Santa Barbara, Biology
    In:  jessie.altstatt@gmail.com | http://aquaticcommons.org/id/eprint/11330 | 29 | 2013-08-26 17:25:52 | 11330
    Details
    Publication Date: 2021-07-01
    Description: Precipitous declines in wild populations of the red abalone Haliotis rufescens and the eventual closure of the commercial and southern recreational fishery have led to renewed interest in supplementing wild stocks with hatchery-raised individuals. Most work to date has focused on releasing small juveniles and has had limited success. Although much is known about larval settlement, juvenile survivorship and growth of abalone, there is scanty information on natural processes in the field. The failure of many regulated fisheries worldwide suggests that both the larval and juvenile stages may be important in determining the future population, and that early juvenile mortality is more important than previously believed. This paper presents a series of experiments designed to examine factors and mechanisms that could affect settlement, survivorship, and growth of larvae and early post-settlers in the field.Laboratory trials under different flow regimes showed that red abalone larvae settled preferentially on substrates encrusted with coralline algae, and that settlement was rapid when exposed to crusts compared to other surfaces. Urchin grazing of films appeared to facilitate abalone settlement but only when urchins were removed. Initial field experiments showed that released larvae settled on natural cobble rock, and that settlement was at least one order of magnitude greater when settlement habitats were tented. I then examined post-settlement survivorship at one and two days after settlement, and found that although there was a large amount of variation, on average 10% of released larvae were found as newly-settled recruits after 1 day. Survivorship and growth of recruits were followed over at least one month in both Spring and Fall. Abalone settled at higher densities, survived better and grew faster in the warmer Fall months than in the Spring. The density of month-old abalone recruits was correlated with density of naturally-occurring gastropods in the Spring, but not in the Fall. These results suggest that settlement and survivorship can be extremely variable across space and time, and that oceanographic and local biotic conditions play a role and should be considered when planning larval seeding.
    Description: Masters
    Description: Copyright permission signed by the author is on file with the IAMSLIC archive. PDF contains 116 pages (front matter + 109 pp.).
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: thesis
    Format: application/pdf
    Format: application/pdf
    Format: 109
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  • 24
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    Estimating biomass of Macrocystis in the Hopkins Marine Life Refuge (edited by James M. Watanabe) (2021)
    Stanford University | Pacific Grove, CA
    In:  http://aquaticcommons.org/id/eprint/10920 | 29 | 2013-02-26 14:46:10 | 10920
    Details
    Publication Date: 2021-07-02
    Description: Copyright permission signed by the author is on file with the IAMSLIC archive.
    Keywords: Biology ; Ecology
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 19
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  • 25
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    Report of the Workshop on Blue Crab Stock Dynamics in Chesapeake Bay, December 13-15, 1982, Chesapeake Biological Laboratory (2021)
    University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory | Solomons, MD
    In:  http://aquaticcommons.org/id/eprint/12395 | 130 | 2014-02-10 02:30:32 | 12395 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-06-30
    Description: This workshop was convened to begin building a foundation of understanding for developing and evaluating proposed measures for the rational management of the blue crab fishery in Chesapeake Bay. Our goal was to generate a summary of knowledge of blue crab stock dynamics. Specifically, we intended to address, and hoped to estimate, the basic parameters of an exploited stock - growth, mortality, natality, migration rates, sex ratios and abundance. In one sense these objectives were simply a means for organizing our discussions. A second objective was to compile at the workshop pertinent data held by the major research institutions on Chesapeake Bay so all participants could see the kinds and extent of existing data. As with many stock assessment problems, tailoring an estimating procedure around known existing data can be more productive than deciding on a procedure and then trying to find the required data in someone else's files.Authors of papers contributed to the report: B.S. Hester and P.R. Mundy (p. 50); Qisheng Tang (p. 86); L. Eugene Cronin (p. 111); J.R. McConaugha (p. 128); Cluney Stagg and Phil Jones (p. 153).
    Description: Chesapeake Bay Commission
    Description: University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Description: Editorial Series #ES-01-83, Center for Environmental and Estuarine Studies of the University of Maryland
    Keywords: Conservation ; Ecology ; Fisheries ; Management ; Planning ; Policies
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 168
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  • 26
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    Ecological factors related to the distribution of Bankia gouldi Bartsch in Chesapeake Bay (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12430 | 130 | 2014-02-08 03:56:16 | 12430 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-06-30
    Description: Organisms were collected on test panels, six inch lengths of dressed two by four inch pine, suspended in the water in a vertical position as described by Turner (1947). The panels were usually located at some convenient structure such as a dock-piling or sea-wall. Except where otherwise indicated by the data, the samples were collected from each station once a month between May 1950 and May 1953. During the three year period, seven hundred and nineteen panels were submerged in Chesapeake Bay. Approximately 14,000 organisms were encountered on these panels of which 20% or approximately 3,000 organisms could be identified from the dried pallets. Preliminary notes on the extent of fouling were made in the field after which the samples were removed to the laboratory for further study.
    Keywords: Biology ; Ecology ; Fisheries ; fouling
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
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  • 27
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    Preliminary Observations on spawning potential in the striped bass (Roccus saxatilis Walbaum) (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12426 | 130 | 2014-02-08 04:04:47 | 12426 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-06-30
    Description: This study was initiated during the summer of 1940 with the following objectives: (1) To determine at what age sexual maturity begins in striped bass of the Chesapeake Bay. (2) To determine whether the potential of reproduction declines with increasing age in Chesapeake Bay fish. (3) To determine whether striped bass in northern waters have a spawning cycle similar to that found in the Chesapeake Bay fish.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
    Format: 16
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  • 28
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    The life history of the silverside, Menidia menidia (Linnaeus) (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12580 | 130 | 2014-02-08 01:03:40 | 12580 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-03
    Description: This paper is based on an attempt to assemble the existing knowledge of the silverside, Menidia menidia, and to contribute to what is known about the life history of this species. A vast amount of work is needed on the ecological relationships between the food fish and the forage fish. One of the most important forage fishes on the Atlantic Coast is the silverside. To understand the inter-relationships between the food fish and the forage fish it is necessary first to understand the life histories of both. For this reason it is important that the life history of this species be studied.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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    Format: 30
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  • 29
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    An ecological study of seasonal distribution of Ostracoda, Solomons Island, Maryland, region (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12579 | 130 | 2014-02-10 02:22:35 | 12579 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-03
    Description: The determination of the distribution and seasonal fluctuations of ostracodes living in the littoral zone directly in front of the Chesapeake Biological Laboratory has been attempted in the present study. Samples taken in other parts of the Chesapeake Bay and around Solomons harbor, show that other species of ostracodes exist but these forms have not been considered in the two-year study here reported. The seasonal distribution of the species was compared with hydrographical records furnished for the same period by the Chesapeake Biological Laboratory in order to determine the correlation between ecological factors and seasonal fluctuations in numbers and species of Ostracoda.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
    Format: 61
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  • 30
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    Muskrats on tidal marshes of Dorchester County (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12581 | 130 | 2014-02-10 02:24:59 | 12581 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-03
    Description: This bulletin reports, in a non-technical manner, investigations on the Virginia muskrat, prevalent in Maryland, from July, 1949 to June, 1951.
    Description: International Health Division of the Rockefeller Foundation
    Description: Maryland Game and Inland Fish Commission
    Keywords: Biology ; Ecology
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
    Format: 36
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    The Effects of coral bleaching in the northern Caribbean and western Atlantic (2021)
    Global Coral Reef Monitoring Network | Townsville, Australia
    In:  http://aquaticcommons.org/id/eprint/12585 | 9 | 2014-03-25 18:32:11 | 12585 | Central Caribbean Marine Institute
    Details
    Publication Date: 2021-07-03
    Keywords: Conservation ; Ecology ; Environment
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 73-84
    Format: 152
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  • 32
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    Economic analysis of climate change adaptation strategies in selected coastal areas in Indonesia, Philippines and Vietnam (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/12706 | 115 | 2013-12-03 13:14:38 | 12706 | WorldFish Center
    Details
    Publication Date: 2021-07-04
    Description: Climate change with its attendant geophysical hazards is well studied. A great deal of attention has gone into analyzing climate change impacts as well as searching out possible mitigating adaptive strategies. These matters are very real concerns, especially for coastal communities. Such communities are often the most vulnerable to climate change, since their citizens frequently live in abject poverty and have limited capacity to adapt to geophysical hazards. Their situation is further complicated by the prospect of dealing with a confluence of hazards in comparison with those in other ecosystems. Against this backdrop Worldfish and the Economy and Environment Program for Southeast Asia (EEPSEA) collaborated to implement the cross-country study “Climate Change Impacts, Vulnerability Assessments, Economic and Policy Analysis of Adaptation Strategies in Selected Coastal Areas in Indonesia, Philippines, and Vietnam”. As its title suggests the study covered selected sites in Vietnam, Indonesia and the Philippines. Employing a gamut of interdisciplinary methodologies -- ranging from community-based approaches such as community hazard mapping and focus group discussions (FGDs) to regression techniques -- the study documented the impacts from three climate hazards affecting coastal communities. These were typhoon/flooding, coastal erosion, and saltwater intrusion. The team also analyzed planned adaptation options suited to implementation by communities and local governments, augmenting autonomous responses of households to protect and insure themselves from these hazards.
    Keywords: Ecology ; Environment ; Inland fisheries ; Climatic changes ; Ecosystems ; Asia ; Indonesia ; Philippines ; Vietnam
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
    Format: 2
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  • 33
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    Community-based marine resource management in Solomon Islands: a facilitators guide (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/12751 | 115 | 2013-12-03 13:58:51 | 12751 | WorldFish Center
    Details
    Publication Date: 2021-07-05
    Description: This guide was developed to document the process and activities that WorldFish staff have used and adapted as facilitators working with communities interested in marine resource management in Solomon Islands. It draws on the experiences from work conducted with FSPI and MFMR through ACIAR funded projects, with communities that had a primary interest in the management of coral reef fisheries. Since 2011 the process has been trialed and adapted further with communities interested in mangrove ecosystem management (through the MESCAL project). This guide is based on lessons about the process of a community developing, writing and implementing a management plan. This guide does not cover lessons about the outcomes of that management.
    Description: CGIAR Research Program on Aquatic Agricultural Systems
    Description: Based on lessons from implementing CBRM with rural coastal communities in Solomon Islands (2005-2013)
    Keywords: Aquaculture ; Fisheries ; Ecology ; Marine resources ; Resource management ; Participatory approach ; Solomon Islands
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 50
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  • 34
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    Report of Chesapeake Biological Laboratory, 1937 (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12760 | 130 | 2014-02-08 01:04:22 | 12760 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-05
    Description: The Chesapeake Biological Laboratory is a research and study center founded to accelerate the acquisition of knowledge through the gathering and dissemination of facts to the end that there may be a fuller appreciation of nature.
    Keywords: Conservation ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 21
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  • 35
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    A governance analysis of the Barotse floodplain system, Zambia: identifying obstacles and opportunities (2021)
    WorldFish | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/12758 | 115 | 2013-12-04 08:33:21 | 12758 | WorldFish Center
    Details
    Publication Date: 2021-07-05
    Description: The Barotse floodplain is an ecosystem characterized by a paradox of widespread poverty amidst high ecological and agricultural potential. The CGIAR Research Program on Aquatic Agricultural Systems (AAS) seeks to address this paradox on the assumption that the rural poor have the potential to transform their lives using the aquatic resources in their environment. Understanding the conditions for natural resources use and management is critical for a program that seeks to transform the livelihoods of households dependent on natural resources. The purpose of this report is to identify and analyze key governance variables influencing the livelihood outcomes of AAS program interventions in the Barotse floodplain system.
    Description: CGIAR Research Program on Aquatic Agricultural Systems
    Keywords: Fisheries ; Policies ; Ecology ; Flood plains ; Policy ; Governance ; Natural resources management ; Zambia
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 13
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  • 36
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    Crab mortality on Chesapeake Bay shedding floats (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12762 | 130 | 2014-02-08 01:07:54 | 12762 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-05
    Description: Reports of high mortality resulting from the impoundment of crabs (Callinectes sapidus) during the preshedding period, to produce soft crabs, have been current in Maryland and Virginia for many years. The death rate of crabs on floats has been estimated by certain of the operators to run as high as 86% at Cape Charles, and to figures nearly as high at Crisfield and elsewhere during one season of the year. A study of this mortality and the factors influencing it have been in progress at the Chesapeake Biological Laboratory for two seasons.
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
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  • 37
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    On four species of Copepoda new to Chesapeake Bay, with a description of a new variety of Paracalanus crassirostris Dahl (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12763 | 130 | 2014-02-08 03:54:32 | 12763 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-05
    Description: At this time, four additional species, unreported by Wilson [1932], can be added to the list of those species to be found within the limits of the bay. These are Acartia tonsa Dana, Cyclops vernalis Fischer, Diaptomus spatulocrenatus Pearse, and Paracalanus crassirostris Dahl var. nudus nov. The specimens from which identifications were made were collected by means of Clarke-Bumpus nets, in use on the motor ship "Mahatru."
    Keywords: Ecology
    Repository Name: AquaDocs
    Type: monograph
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  • 38
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    Report of Chesapeake Biological Laboratory, 1938 (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12761 | 130 | 2014-02-08 03:53:19 | 12761 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-05
    Description: Substantial progress was made in 1938 both in respect to additions made in the physical plant and to the problems effectively pursued by an energetic staff.
    Keywords: Conservation ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
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  • 39
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    A survey of the marine nematodes of Chesapeake Bay, Maryland (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12825 | 130 | 2014-02-08 01:01:26 | 12825 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-06
    Description: The study here reported is a survey of the most common non-parasitic nematode families of Chesapeake Bay, Maryland, with descriptions and figures, so that ecological workers and students of invertebrate zoology may be encouraged not to pass over this highly interesting and abundant invertebrate phylum. This survey is not a complete account of the free-living nematode population of the Bay, however, since only the middle section of the Bay was sampled and since the collections were not made systematically throughout the year. The physical and chemical factors of Chesapeake Bay may be found in several publications of the Chesapeake Biological Laboratory, Solomons Island, Maryland, and in the records of the Chesapeake Bay Institute, Annapolis, Maryland.
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
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    Format: application/pdf
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  • 40
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    A study of water quality in Baltimore Harbor (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12824 | 130 | 2014-02-08 04:02:55 | 12824 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-06
    Description: Baltimore Harbor is polluted by discharge of sewage and industrial wastes into tributary streams and peripheral waters. The Harbor is used extensively for navigation, industrial water supply, and recreation as well as for waste disposal. The degree of pollution varies from negligible in the principal fairway to severe in the innermost sections. Private industry discharges several hundred tons of acid materials daily and is also the principal source of organic pollution.
    Description: PDF includes 141 pp. (front matter + 132 pp.).
    Keywords: Conservation ; Ecology ; Environment ; Pollution
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 132
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  • 41
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    Effect of Susquehanna River stream flow on Chesapeake Bay salinities and history of past oyster mortalities on upper Bay bars (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12826 | 130 | 2014-02-08 03:57:09 | 12826 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-06
    Description: A study of possible causes for extensive mortality of oysters in the Upper Chesapeake Bay was taken on by year-round monitoring of conditions during a two-year period.
    Description: Reprinted from 1946 annual report, Maryland Board of Natural Resources.
    Keywords: Ecology ; Environment ; Fisheries
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    Type: monograph
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  • 42
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    Introduction to fish species diversity: Sunamganj haor region within CBRMP's working area (2021)
    Community Based Resource Management Project-LGED | Dhaka, Bangladesh
    In:  http://aquaticcommons.org/id/eprint/12822 | 115 | 2013-12-04 11:23:18 | 12822 | WorldFish Center
    Details
    Publication Date: 2021-07-06
    Description: This book is a modest attempt at identifying Sunamganj haor fish species, especially in areas falling under the Sunamganj Community Based Resource Management Project (CBRMP). It contains a total of 126 fish species from 39 families found in the Sunamganj haor area. CBRMP has promoted community based fisheries management approaches that, along with their livelihoods focus, are helping to preserve and enhance natural fish stocks in the hoar basin. WorldFish support to LGED involves a number of areas including monitoring the impacts of CBRMP on fish catch, bio-diversity and livelihoods.
    Description: Community Based Resource Management Project
    Description: Research Team: Balaram Mahalder, M. G. Mustafa Editing: Dr. M. Niamul Naser, A.K.M. Firoz Khan
    Keywords: Ecology ; Fisheries ; Freshwater fish ; Species diversity ; Research ; Bangladesh
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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  • 43
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    Fresh-water dinoflagellates of Maryland (2021)
    Chesapeake Biological Laboratory | Solomons Island, MD
    In:  http://aquaticcommons.org/id/eprint/12827 | 130 | 2014-02-10 02:21:33 | 12827 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-07-06
    Description: Collections were made in the summer of 1942 and again at different times in 1946 and 1947. Some collections were not sufficient in numbers to allow for proper identification, so the present paper does not give a complete list. Of the 20 identified species reported on in the paper, two are new to science and ten have not been reported previously for the United States.
    Keywords: Ecology ; Environment
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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  • 44
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    Observations of the Effects of Oil Field Structures on their biotic Environment: Platform Fouling Community (2021)
    Dames & Moore | Houston, TX
    In:  http://aquaticcommons.org/id/eprint/14137 | 9596 | 2020-08-31 18:05:50 | 14137 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: The fouling community, its planktonic larvae and its predators were studied at Buccanneer Field, Texas from May, 1976 to April, 1977. Sixteen algae and 101 invertebrate species were identified from the structures. The existing fouling community was dominated by the large barnacle Balanus tintinnabulum, which provided a matrix of crevices in which other invertebrates were found. Unoccupied space was rare in the natural community but persisted for several months in disturbed quadrats, especially in winter. The erect bryozoan Savignyella lafonti and the urchin Arbacia punctulata were seasonally common on the well jacket but absent or rare on the production platform. On the other hand, the erect bryozoans Bugula neritina and Bugula rylandi and the hydroid Tubularia crocea were seasonally common on the platform but rate on the well jacket. Predator exclusion cages on experimental quadrats seemed to encourage the development of Savignyella lafonti and tubes of the corophiid amphipod Erichthonius brasiliensis. Scraped quadrats were recolonized primarily by hydroids, green algae and sponges. Several fouling species were found on shells on the bottom directly beneath the structures which did not occur on the structures themselves. Growth rates of several mollusks (Pteria colymbus, Musculus lateralis, Anadara transversa, Aequipecten gibbus, and Ostrea equestris) were sufficiently rapid to permit adult size to be attained in less than one year.
    Keywords: Ecology ; biotic environment ; fouling ; oil field structures ; planktonic species
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    Nereis (Neanthes) micromma n.sp. (Polychaeta: Nereididae) from the northern Gulf of Mexico with a note of the structure of neriedid palps. (2021)
    In:  http://aquaticcommons.org/id/eprint/14176 | 9596 | 2020-08-31 20:27:04 | 14176 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: A new species of polychaete annelid, Nereis (Neanthes) micromma, is described and illustrated. The species, which is most abundant on muddy sand bottoms, has been collected offshore from the Texas coast. The inappropriateness of biarticulate in describing the palps of some nereidids is discussed.
    Keywords: Ecology ; marine invertebrates ; polychaetes ; marine annelids ; new species ; Nereis (Neanthes) micromma ; reproduction ; seasonal distribution
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    Type: article
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    Format: application/pdf
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  • 46
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    Oyster Studies Along the Texas Coast, 1968 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14240 | 9596 | 2020-08-31 20:19:08 | 14240 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Oyster (Crassostrea virginica) studies showed death rates to be low in Aransas and Galveston Bays but relatively high in Matagorda Bay. Initial mortality in Matagorda Bay was associated with freshwater and siltation but subsequent summer deaths were associated with Labyrinthomyxa infection.
    Keywords: Ecology ; oysters ; Crassostrea virginica ; mortality ; oyster fisheries ; Labyrinthomyxa sp. ; fungal diseases ; stock assessment ; GBIC
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  • 47
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    Levels of Concentration and Incidence of Various Pesticide Toxicants in Some Species from Selected Bay Areas (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14239 | 9596 | 2020-08-23 21:29:40 | 14239 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Tissue samples analyzed indicate that residues of some pesticides are present in all Texas bay areas sampled, including Galveston Bay. The residues detected are DDT, Dieldrin and Endrin. The incident of DDT residues decreased slightly in both oyster, Crassostrea virginica, and fish samples during the study period. The incidence of Dieldrin increased dramatically in oyster samples while decreasing in fish samples. The incidence of Endrin remained essentially unchanged. Ovaries of speckled trout, Cynoscion nebulosus, contained enough DDT residue to cause concern over the possible impairment of reproductive ability.
    Keywords: Ecology ; pesticides ; dichlorodiphenyltrichloroethane (DDT) ; dieldrin ; endrin ; oysters ; Crassostrea virginica ; speckled trout ; Cynoscion nebulosus ; GBIC
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  • 48
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    Population Studies of the Sports and Commercial Fin-fish and Forage Species of the Galveston Bay system (2021)
    Texas Game and Fish Commission Marine Laboratory | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14199 | 9596 | 2020-08-31 20:31:42 | 14199 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Collections were made at fixed stations with various types of gear to obtain samples of adult game fish, juvenile game fish, and forage species. The stations in West Bay generally produced larger catches of juvenile and adult game fish than did the stations in other bays. The reverse was true of forage collections. Those forage stations in the less saline areas of the bay, for example, the Clear Lake Station, produced larger catches than the lower bay stations. Fish tags, returned during the study, indicated little movement of those fish recaptured. Redfish tag returns were much higher than those from other species.
    Keywords: Ecology ; Fisheries ; marine fish ; population dynamics ; ecological distribution ; tagging
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    Format: application/pdf
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  • 49
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    Ecological Attribute Alteration: Measurement and Evaluation: Activity Assessment Routine: Ecological Systems Component (2021)
    RPC, Inc. | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14166 | 9596 | 2020-08-31 20:24:34 | 14166 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: This technical paper is intended to provide a more complete treatment of implicit principles and assumptions contained in the user's manual for the ecological systems component of the activity assessment routine. The ecological systems component (ESC) defines a method for evaluating changes in an ecosystem which may result from resource use and consumption. This paper begins by characterizing an ecosystem as an organized collection of attributes mutually dependent on energy exchange. The magnitude matrix with which altered energy flows are scaled is described in Chapter 4. The magnitude of an alteration is assessed somewhat differently for the two categories of attributes: discussion of conventions relevant to this distinction is provided in Chapter 5. However, effects on attributes are variable through time, and additional remarks concerning duration are included in Chapter 6. Finally, possible exceptions to the general guidelines for designating the direction of an effect are introduced in Chapter 7.
    Keywords: Ecology ; Management ; coastal zone management ; ecological assessment ; evaluation
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    Format: 60
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  • 50
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    Field Guide to the Flatfishes of the Family Bothidae in the Western North Atlantic (2021)
    In:  http://aquaticcommons.org/id/eprint/14184 | 9596 | 2020-08-31 20:27:57 | 14184 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Keys are presented to facilitate both field and laboratory identification of the 14 genera and 47 species of flatfishes in the western North Atlantic. Illustrations for 46 species, the salient familial and subfamily characteristics, and short descriptions with geographic and bathymetric distributions are given.
    Keywords: Ecology ; Fisheries ; marine fish ; flatfishes ; Bothidae ; identification keys ; ecological distribution
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    Type: monograph
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  • 51
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    Study of the Texas Bay Populations of Juvenile Shrimp, Penaeus aztecus, Penaeus setiferus, and Penaeus duorarum (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14185 | 9596 | 2020-08-31 20:28:08 | 14185 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Postlarvae were found entering Aransas Bay in appreciable numbers in the spring of 1963. Late post-larval and early juvenile stages of brown shrimp, Penaeus aztecus, were found in tertiary bays in April. White shrimp, P. setiferus were found in May and June. Brown shrimp grew about 0.8 mm per day, while white shrimp grew about 1.1 mm per day. The first wave appeared to be smaller than latter waves. Small brown shrimp were found moving through the inshore Gulf in large numbers in June and July. White shrimp reached a larger size in the bays in June and July. White shrimp reached a larger size in the bays and supported a large commercial bay fishery. Late fall waves of white shrimp left the bays at a smaller size (probably to escape low water temperatures). Preliminary data indicate the 1963 shrimp landings increased 25% over 1962 landings.
    Keywords: Ecology ; penaeid shrimp ; juveniles ; landing statistics ; white shrimp ; Penaeus setiferus ; brown shrimp ; Penaeus aztecus ; Penaeus duorarum ; growth
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  • 52
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    Report on Studies of Oyster Parasites in the Aransas Bay and Galveston Bay areas of Texas (2021)
    Texas Game and Fish Commission | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14238 | 9596 | 2020-08-28 14:53:38 | 14238 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: The first collection of oyster for this study was taken off Fulton Beach, Aransas Bay on January 1, 1962. Subsequently, 34 collections were made, most of them in Aransas Bay, but several collections were made in Mesquite, Tres Palacios, Corpus Christi, and Galveston Bays. These oysters were sectioned and slides made, a total of more than 1300. All collections were of live oysters, and the reading of the slides was a slow process. Live oysters were used because the platforms which were to hold trays of oysters were delayed in construction. Hence, no data on mortality are available. The period from January 1, 1962, to June 26, 1962, was used to determine roughly from the slides what parasites and diseases were present and where they were located. The data on collections are listed in Table 1.
    Keywords: Ecology ; oysters ; parasites ; parasitism ; GBIC
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  • 53
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    A study of commercial shrimp populations in coastal bays of Texas,1968 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14243 | 9596 | 2020-08-23 21:20:15 | 14243 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: In spring, the growth of brown shrimp, Penaeus aztecus, in Texas bays, including Galveston Bay, was delayed by cold water. Low salinity patterns of upper coastal bays confined the young to more saline lower regions of estuaries. The gulfward migration began in late May. By July most had left the bays. Heavy rainfall and runoff may have been beneficial to white shrimp, Penaeus setiferus. They were abundant in samples and over 12 million pounds were landed commercially.
    Keywords: Ecology ; penaeid shrimp ; temperature effects ; Penaeus aztecus ; salinity effects ; Penaeus setiferus ; growth ; estuaries ; population dynamics ; GBIC
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  • 54
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    Check list of the fishes and commercial shrimp of Area M-2 (2021)
    Texas Game and Fish Commission | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14210 | 9596 | 2020-08-31 20:16:44 | 14210 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Stations were established throughout the area in order to obtain a full and representative sampling of the fishes present. Of the 78 species of fish included in this checklist some 48 might be considered to be endemic, living significant portions of their lives in the area. Twenty-two appear to be occasional visitors, and eight are juvenile stragglers into the area. Data concerning the commercial shrimp are presented last.
    Keywords: Ecology ; Fisheries ; marine fisheries ; marine fish ; shrimp fisheries ; check lists ; distribution ; penaeid shrimp ; GBIC
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  • 55
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    Chemical and physical analysis of the water of Area M-2 (2021)
    Texas Game and Fish Commission | Rockport, TX
    In:  http://aquaticcommons.org/id/eprint/14213 | 9596 | 2020-08-23 22:33:19 | 14213 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Observations and analysis of the various features of the water of upper Galveston and Trinity Bays (Area M-2) were made using dye, thermometers, chemical tests, and other appropriate methods. Information and data were also collected from numerous publications and other sources. The distribution of marine organisms relative to pollution in the Houston Ship Channel was investigated.
    Keywords: Chemistry ; Ecology ; Pollution ; chemical analysis ; physical properties ; water analysis ; pollution ; marine organisms ; ecological distribution ; GBIC
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    Format: application/pdf
    Format: 19
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  • 56
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    Effects of Engineering Projects on the Ecology of Jones Bay - Effects of Engineering Projects on Galveston Bay Estuaries - Evaluation of the Effects of Estuarine Engineering Projects (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14262 | 9596 | 2020-08-23 20:01:31 | 14262 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: In 1962 construction was begun on the Texas City and Vicinity Hurricane- Flood Protection Project, a program of the U.S. Corps of Engineers, which provided for a 16.2 mile long earthen seawall along the western shoreline of Galveston Bay. This levee, with a maximum height of 23 feet above sea level, was designed to protect low areas from tidal flooding during storms. In 1964, the Hitchcock Extension of the Hurricane-Flood Protection was proposed, a plan consisting of an 11.4 mile levee to protect the city of Hitchcock and vicinity. A portion of this levee crosses Jones Bay. Circulation in the bay would be provided by a closable tidal structure and culvert openings.
    Keywords: Ecology ; Engineering ; Environment ; flood control ; sea walls ; levees ; environmental effects ; ecology ; GBIC
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  • 57
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    Study of Sand Seatrout of the Galveston Bay Area (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14274 | 9596 | 2020-10-17 16:17:25 | 14274 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Sand seatrout (Cynoscion arenarius Ginsberg) were studied in the Galveston Bay area to provide information on seasonality, population composition, food items, growth, and spawning. Tagging efforts resulted in 518 tagged fish and a return of 16 tags during the 1968-70 period. Tag recovery data suggest a migration from the upper bay to the lower bay and Gulf waters in December and return in March. Electrophoretic analysis of multiple hemoglobin protein types were studied from 96 sand seatrout blood samples. Five protein types were observed without discernible differences that could be attributed to population heterogeneity. Analysis of stomach content revealed crustacea and fish as primary food items. Gonad development stages indicate a spawning period from March through August.
    Keywords: Ecology ; marine fish ; sand seatrout ; Cynoscion arenarius ; growth ; seasonality ; community composition ; food preferences ; spawning ; tagging ; stomach content ; migrations ; electrophoresis ; GBIC
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  • 58
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    Galveston Bay Oyster Studies, 1971 (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14264 | 9596 | 2020-08-23 20:48:55 | 14264 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Galveston Bay oyster stocks were studied to detect changes which might affect the public reef oyster harvest. A mild winter and above normal salinity values favored increased disease (Labyrinthomyxa) incidence as well as increased predation from oyster drills (Thais) and stone crabs (Menippe). These factors resulted in annual death rates of 52% to 55% among older oysters groups. Oyster spat in an epidemic area were Labyrinthomyxa-infected by fall and suffered above normal mortality.
    Keywords: Ecology ; Fisheries ; oysters ; stock assessment ; oyster reefs ; oyster fisheries ; predation ; fungal diseases ; oyster drills ; stone crab ; seed ; spat ; larval settlement ; mortality ; survival ; GBIC
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  • 59
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    Analysis of Populations of Sports and Commercial Fin-fish in the Coastal Bays of Texas (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14242 | 9596 | 2020-08-31 20:19:45 | 14242 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Juvenile game fish were sampled in 1968 in all Texas bay areas with 60 ft. bag seines; adult fish were sampled in Galveston Bay by drag seine and in Aransas Bay and the Upper and Lower Laguna Madre with trammel nets. A general and significant increase in the relative abundance of juvenile redfish, Sciaenops ocellata, was noted. In the case of trout, Cynoscion nebulosus, flounder, Paralichthys lethostigma, black drum, Pogonias cromis, and sheepshead, Archosargus probatocephalus, there was either a decline in general abundance or no significant change from the previous year. While variations in abundance of adult fish occurred within bays, no coastwide patterns could be discerned. These samples were obtained in order to determine relative abundance, seasonal fluctuations in abundance and success of spawning. Captured fish of sufficient size and in good condition were tagged and released to study movements, migrations and rate of fishing harvest.
    Keywords: Ecology ; Fisheries ; marine fish ; game fish ; finfish fisheries ; juveniles ; commercial species ; population dynamics ; seine nets ; entangling nets ; abundance ; seasonal variations ; spawning ; GBIC
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  • 60
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    Survey of Fish Populations in the Inshore Gulf of Mexico off Texas (2021)
    Texas Parks and Wildlife Department | Austin, TX
    In:  http://aquaticcommons.org/id/eprint/14247 | 9596 | 2020-08-28 15:46:37 | 14247 | Galveston Bay Information Collection
    Details
    Publication Date: 2021-06-24
    Description: Fish populations in the inshore Gulf of Mexico off Port Aransas, Texas, Port Mansfield and Port Isabel, Texas and briefly off Galveston, Texas, were surveyed for type, abundance and size with a flat otter trawl. In regular weekly samples, 25,044 fish of 89 species were caught in 100 otter trawl samples. Atlantic croaker, Micropogon undulatus; sand trout, Cynoscion nothus; moonfish, Vomer setapinnis; bumper, Chloroscombrus chrysurus; and shoal flounder Syacium gunteri, were the five most abundant species taken in depths ranging from 3 to 16 fathoms. These results indicate that enough trash fish may be caught during routine shrimp trawling to sustain a profitable fishery if a market develops. No attempt was made to evaluate the abundance of larger food or game fishes.
    Keywords: Ecology ; Fisheries ; marine fish ; trawl nets ; population dynamics ; GBIC
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  • 61
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    Sea surface temperature and the subsequent freshwater survival rate of some salmon stocks: a surprising link between the climate of land and sea (2021)
    In:  http://aquaticcommons.org/id/eprint/14469 | 8 | 2014-02-14 00:44:32 | 14469
    Details
    Publication Date: 2021-06-25
    Description: Previous consideration of the relationship between climate and the survival rate of Pacific salmon eggs and fry has been confined to effects of large variation in the ambient freshwater environment; e.g., stream discharge, temperature, turbidity. This analysis shows sea surface temperatures during the last year of life of maturing adult salmon are also strongly associated with the subsequent survival rate of salmon eggs and fry is fresh water, presumably through development of the future eggs or sperm. In several stocks of three species of North American salmon, the association between the "marine" climate and egg survival is stronger than, or additive to, any estimated climatic association in fresh water. This apparent and surprising link between fresh water and the distant ocean has some interesting and complex implications for management of future salmon production.
    Keywords: Ecology ; Oceanography ; PACLIM
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  • 62
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    Application of an acoustic–trawl survey design to improve estimates of rockfish biomass (2021)
    In:  dana.hanselman@noaa.gov | http://aquaticcommons.org/id/eprint/14482 | 403 | 2014-02-27 17:12:09 | 14482 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-25
    Description: Biomass estimates of several species of Alaskan rockfishesexhibit large interannual variations. Because rockfishes are long lived and relatively slow growing, large, short-term shifts in population abundance are not likely. We attribute the variations in biomass estimates to the high variability in the spatial distribution of rockfishes that is not well accounted for by the survey design currently used. We evaluated the performance of an experimental survey design, the Trawl and Acoustic Presence/Absence Survey (TAPAS), to reduce the variability in estimated biomass for Pacific ocean perch (Sebastes alutus). Analysis of archived acoustic backscatter data produced an acoustic threshold for delineating potential areas of high (“patch”) and low (“background”) catch per unit of effort (CPUE) in real time. In 2009, we conducted a 12-day TAPAS near Yakutat, Alaska. We completed 59 trawls at 19 patch stations and 40 background stations. The design performed well logistically, and Pacific ocean perch (POP) accounted for 55% of the 31 metric tons (t) of the catch from this survey. The resulting estimates of rockfish biomass were slightly less precise than estimates from simple random sampling. This difference in precision was due to the weak relationship of CPUE to mean volume backscattering and the relatively low variability of POP CPUE encountered. When the data were re-analyzed with a higher acoustic threshold than the one used in the field study, performance was slightly better with this revised design than with the original field design. The TAPAS design could be made more effective by establishing a stronger link between acoustic backscatter and CPUE and by deriving an acoustic threshold that allows better identification of backscatter as that from the target species.
    Keywords: Biology ; Ecology ; Fisheries
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  • 63
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    Temporal trends (2000–2011) and influences on fishery-independent catch rates for loggerhead sea turtles (Caretta caretta) at an important coastal foraging region in the southeastern United States (2021)
    In:  arendtm@dnr.sc.gov | http://aquaticcommons.org/id/eprint/14489 | 403 | 2014-02-13 04:28:13 | 14489 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-26
    Description: Seasonal trawling was conducted randomly in coastal (depths of 4.6–17 m) waters from St. Augustine, Florida, (29.9°N) to Winyah Bay, South Carolina (33.1°N), during 2000–03, 2008–09, and 2011 to assess annual trends in the relative abundance of sea turtles. A total of 1262 loggerhead sea turtles (Caretta caretta) were captured in 23% (951) of 4207 sampling events. Capture rates (overall and among prevalent 5-cm size classes) were analyzed through the use of a generalized linear model with log link function for the 4097 events that had complete observations for all 25 model parameters. Final models explained 6.6% (70.1–75.0 cm minimum straight-line carapace length [SCLmin]) to 14.9% (75.1–80.0 cm SCLmin) of deviance in the data set. Sampling year, geographic subregion, and distance from shore were retained as significant terms in all final models, and these terms collectively accounted for 6.2% of overallmodel deviance (range: 4.5–11.7% of variance among 5-cm size classes). We retained 18 parameters only in a subset of final models: 4 as exclusively significant terms, 5 as a mixture of significant or nonsignificant terms, and 9 as exclusively nonsignificant terms. Four parameters also were dropped completely from all final models. The generalized linear model proved appropriate for monitoring trends for this data set that was laden with zero values for catches and was compiled for a globally protected species. Because we could not account for much model deviance, metrics other than those examined in our study may better explain catch variability and, once elucidated, their inclusion in the generalized linear model should improve model fits.
    Keywords: Biology ; Ecology ; Fisheries
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  • 64
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    Reactions of fishes to two underwater survey tools, a manned submersible and a remotely operated vehicle (2021)
    In:  tom.laidig@noaa.gov | http://aquaticcommons.org/id/eprint/14494 | 403 | 2014-02-13 04:22:14 | 14494 | United States National Marine Fisheries Service
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    Publication Date: 2021-06-26
    Description: We examined the reactions of fishes to a manned submersible and a remotely operated vehicle (ROV) during surveys conducted in habitats of rock and mud at depths of 30–408 m off central California in 2007. We observed 26 taxa for 10,550 fishes observed from the submersible and for 16,158 fishes observed from the ROV. A reaction was defined as a distinct movement of a fish that, for a benthic or hovering individual, was greater than one body length away from its initial position or, for a swimming individual, was a change of course or speed. Of the observed fishes, 57% reacted to the ROV and 11% reacted to the submersible. Aggregating species and those species initially observed off the seafloor reacted most often to both vehicles. Fishes reacted more often to each vehicle when they were 〉1 m above the seafloor (22% of all fishes 〉1 m above the seafloor reacted to the submersible and 73% to the ROV) than when they were in contact with the seafloor (2% of all reactions to the submersible and 18% to the ROV). Fishes reacted by swimming away from both vehicles rather than toward them. Consideration of these reactions can inform survey designs and selection of survey tools and can, thereby, increase the reliability of fish assemblage metrics (e.g., abundance, density, and biomass) and assessments of fish and habitat associations.
    Keywords: Biology ; Ecology ; Fisheries
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    A new species of western Atlantic lizardfish (Teleostei: Synodontidae: Synodus) and resurrection of Synodus bondi Fowler, 1939, as a valid species from the Caribbean with redescriptions of S. bondi, S. foetens (Linnaeus, 1766), and S. intermedius (Agassiz, 1829) (2021)
    In:  frableb@si.edu | http://aquaticcommons.org/id/eprint/14499 | 403 | 2014-02-13 04:18:37 | 14499 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-26
    Description: Western Atlantic synodontid species were studied as part of an ongoing effort to reanalyze Caribbean shorefish diversity. A neighbor-joining tree constructed from cytochrome c oxidase I (COI) data revealed 2 highly divergent genetic lineages within both Synodus intermedius (Agassiz, 1829) (Sand Diver) and S. foetens (Linnaeus, 1766) (Inshore Lizardfish). A new species, Synodus macrostigmus, is described for one of the S. intermedius lineages. Synodus macrostigmus and S. intermedius differ in number of lateral-line scales, caudal pigmentation, size of the scapular blotch, and shape of the anterior-nostril flap. Synodus macrostigmus and S. intermedius have overlapping geographic and depth distributions, but S. macrostigmus generally inhabits deeper water (〉28 m) than does S. intermedius and is known only from coastal waters of the southeastern United States and the Gulf of Mexico, in contrast to those areas and the Caribbean for S. intermedius. Synodus bondi Fowler, 1939, is resurrected from the synonymy of S. foetens for one of the S. foetens genetic lineages. The 2 species differ in length and shape of the snout, number of anal-fin rays, and shape of theanterior-nostril flap. Synodus bondi and S. foetens co-occur in the central Caribbean, but S. bondi otherwise has a more southerly distribution than does S. foetens. Redescriptions are provided for S. intermedius, S. foetens, and S. bondi. Neotypes are designated for S. intermedius and S. foetens. A revised key to Synodus species in the western Atlantic is presented.
    Keywords: Biology ; Ecology ; Fisheries
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    Quantifying intrapopulation variability in stable isotope data for Spotted Seatrout (Cynoscion nebulosus) (2021)
    In:  fulford.richard@epa.gov | http://aquaticcommons.org/id/eprint/14498 | 403 | 2014-02-13 04:19:23 | 14498 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-26
    Description: Stable isotope (SI) values of carbon (δ13C) and nitrogen (δ15N) are useful for determining the trophic connectivity between species within an ecosystem, but interpretation of these data involves important assumptions about sources of intrapopulation variability. We compared intrapopulation variability in δ13C and δ15N for an estuarine omnivore, Spotted Seatrout (Cynoscion nebulosus), to test assumptions and assess the utility of SI analysis for delineation of the connectivity of this species with other species in estuarine food webs. Both δ13C and δ15N values showed patterns of enrichment in fish caught from coastal to offshore sites and as a function of fish size. Results for δ13C were consistent in liver and muscle tissue, but liverδ15N showed a negative bias when compared with muscle that increased with absolute δ15N value. Natural variability in both isotopes was 5–10 times higher than that observed in laboratory populations, indicating that environmentally driven intrapopulation variability is detectable particularly after individual bias is removed through sample pooling. These results corroborate the utility of SI analysis for examination of the position of Spotted Seatrout in an estuarine food web. On the basis of these results, we conclude that interpretation of SI data in fishes should account for measurable and ecologically relevant intrapopulation variability for each species and system on a case by case basis.
    Keywords: Biology ; Ecology ; Fisheries
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    Shifts in the estuarine demersal fish community after a fishery closure in Puget Sound, Washington (2021)
    In:  essing@uw.edu | http://aquaticcommons.org/id/eprint/14504 | 403 | 2014-02-13 18:26:57 | 14504 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-26
    Description: Puget Sound is one of the largest and most ecologically significant estuaries in the United States, but the status and trends of many of its biological components are not well known. We analyzed a 21-year time series of data from standardized bottom trawl sampling at a single study area to provide the first assessment of population trends of Puget Sound groundfishes after the closure of bottom trawl fisheries. The expected increase in abundance was observed for only 3 of 14 species after this closure, and catch rates of most (10) of the abundant species declined through time. Many of these changes were stepwise (abrupt) rather than gradual, and many stocks exhibited changes in catch rate during the 3-year period from 1997 through 2000. Nodetectable change was recorded for either temperature or surface salinity over the entire sampling period. The abrupt density reductions that were observed likely do not reflect changes in demographic rates but may instead represent distributional shifts within Puget Sound.
    Keywords: Biology ; Ecology ; Fisheries
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    Migratory and within-estuary behaviors of adult Summer Flounder (Paralichthys dentatus) in a lagoon system of the southern mid-Atlantic Bight (2021)
    In:  kcapossela@dnr.state.md.us | http://aquaticcommons.org/id/eprint/14503 | 403 | 2014-02-13 18:09:48 | 14503 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-26
    Description: We monitored the movements of 45 adult Summer Flounder (Paralichthys dentatus) between June 2007 and July 2008 through the use of passive acoustic telemetry to elucidate migratory and within-estuary behaviors in a lagoon system of the southern mid-Atlantic Bight. Between 8 June and 10 October 2007, fish resided primarily in the deeper (〉3 m) regions of the system and exhibited low levels of large-scale (100s of meters) activity. Mean residence time within this estuarine lagoon system was conservatively estimated to be 130 days (range: 18–223 days), which is 1.5 times longer than the residence time previously reported for Summer Flounder in a similar estuarine habitat ~250 km to the north. The majority of fish remained within the lagoon system until mid-October, although some fish dispersed earlier and some of them appeared to disperse temporarily (i.e., exited the system for at least 14 consecutive days before returning). Larger fish were more likely to disperse before mid-October than smaller fish and may have moved to other estuaries or the inner continental shelf. Fish that dispersed after mid-October were more likely to return to the lagoon system the following spring than were fish that dispersed before mid-October. In 2008, fish returned to the system between 7 February and 7 April. Dispersals and returns most closely followed seasonal changes in mean water temperature, but photoperiod and other factors also may have played a role in large-scale movements of Summer Flounder.
    Keywords: Biology ; Ecology ; Fisheries
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    Influence of soak time and fish accumulation on catches of reef fishes in a multispecies trap survey (2021)
    In:  nate.bacheler@noaa.gov | http://aquaticcommons.org/id/eprint/14505 | 403 | 2014-02-13 18:36:35 | 14505 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-26
    Description: Catch rates from fishery-independent surveys often are assumed to vary in proportion to the actual abundance of a population, but this approach assumes that the catchability coefficient (q) is constant. When fish accumulate in a gear, the rate at which the gear catches fish can decline, and, as a result, catch asymptotes and q declines with longer fishing times. We used data from long-term trap surveys (1990–2011) in the southeastern U.S. Atlantic to determine whether traps saturated for 8 reef fish species because of the amount of time traps soaked or the level of fish accumulation (the total number of individuals of all fish species caught in a trap). We used a delta-generalized-additive model to relate the catch of each species to a variety of predictor variables to determine how catch was influenced by soak time and fish accumulation after accounting for variability in catch due to the other predictor variables in the model. We found evidence of trap saturation for all 8 reef fish species examined. Traps became saturated for most species across the range of soak times examined, but trap saturation occurred for 3 fishspecies because of fish accumulation levels in the trap. Our results indicate that, to infer relative abundance levels from catch data, future studies should standardize catch or catch rates with nonlinear regression models that incorporate soak time, fish accumulation, and any other predictor variable that may ultimately influence catch. Determination of the exact mechanisms that cause trap saturation is a critical need for accurate stock assessment, and our results indicate that these mechanisms may vary considerably among species.
    Keywords: Biology ; Ecology ; Fisheries
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    Multiscale analysis of factors that affect the distribution of sharks throughout the northern Gulf of Mexico (2021)
    In:  mdrymon@disl.org | http://aquaticcommons.org/id/eprint/14532 | 403 | 2014-02-14 20:00:41 | 14532 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-27
    Description: Identification of the spatial scale at which marine communities are organized is critical to proper management, yet this is particularly difficult to determine for highly migratory species like sharks. We used shark catch data collected during 2006–09 from fishery-independent bottom-longline surveys, as well as biotic and abiotic explanatory data to identify the factors that affect the distribution ofcoastal sharks at 2 spatial scales in the northern Gulf of Mexico. Centered principal component analyses (PCAs) were used to visualize the patterns that characterize shark distributions at small (Alabama and Mississippi coast) and large (northern Gulf of Mexico) spatial scales. Environmental data on temperature, salinity, dissolved oxygen (DO), depth, fish and crustacean biomass, and chlorophyll-a (chl-a) concentration were analyzed with normed PCAs at both spatial scales. The relationships between values of shark catch per unit of effort (CPUE) and environmental factors were then analyzed at each scale with co-inertia analysis (COIA). Results from COIA indicated that the degree of agreement between the structure of the environmental and shark data sets was relatively higher at the small spatial scale than at the large one. CPUE of Blacktip Shark (Carcharhinus limbatus) was related positively with crustacean biomass at both spatial scales. Similarly, CPUE of Atlantic Sharpnose Shark (Rhizoprionodonterraenovae) was related positively with chl-a concentrationand negatively with DO at both spatial scales. Conversely, distribution of Blacknose Shark (C. acronotus) displayed a contrasting relationship with depth at the 2 scales considered. Our results indicate that the factors influencing the distribution of sharks in the northern Gulf of Mexico are species specific but generally transcend the spatial boundaries used in our analyses.
    Keywords: Biology ; Ecology ; Fisheries
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    Population genetics of Cobia (Rachycentron canadum): implications for fishery management along the coast of the southeastern United States (2021)
    In:  dardent@dnr.sc.gov | http://aquaticcommons.org/id/eprint/14536 | 403 | 2014-02-14 22:10:01 | 14536 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-27
    Description: Cobia (Rachycentron canadum) is a pelagic, migratory species with a transoceanic distribution in tropical and subtropical waters. Recreational fishing pressure on Cobia in the United States has increased substantially during the last decade, especially in areas of its annual inshore aggregations, making this species potentially susceptible to overfishing. Although Cobia along the Atlantic and Gulf coasts of the southeastern United States are currently managed as a single fishery, the genetic composition of Cobias in these areas is unclear. On the basis of a robust microsatellite data set from collections along the U.S. Atlantic coast (2008–09), offshore groups were genetically homogenous. However, the 2 sampled inshore aggregations (South Carolina and Virginia) were genetically distinct from each other, as well as from the offshore group. The recapture of stocked fish within their release estuary 2 years after release indicates that some degree of estuarine fidelity occurs within these inshore aggregations and supports the detection of their unique genetic structure at the population level. These results complement the observed high site fidelity of Cobias in South Carolina and support a recent study that confirms that Cobia spawn in the inshore aggregations. Our increased understanding of Cobia life history will be beneficial for determining the appropriate scale of fishery management for Cobia.
    Keywords: Biology ; Ecology ; Fisheries ; Management
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    Leaf growth of the seagrass Syringodium filiforme in outer Florida Bay, Florida (2021)
    In:  arthur@virginia.edu | http://aquaticcommons.org/id/eprint/14908 | 403 | 2014-03-11 22:34:30 | 14908 | United States National Ocean Service
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    Publication Date: 2021-06-28
    Description: Leaf growth of the seagrass Syringodium filiforme (Kütz., 1860) was determined using a new technique based on the growth of emergent leaves (EL method) and compared to the more labor intensive repeated measurements (RM) and demographic allometric age reconstruction techniques (DA). All three techniques were used to compare leaf growth dynamics of plants with different morphologies at two sites, a shallow water (0.5 m) banktop and an adjacent deeper water (1.5 m) environment in outer Florida Bay, Florida. Leaf formation rates (Leaf Plastochrone Interval or PI) determined using the EL and RM methods were nearly identical, with means of 20 and 21 d leaf–1 at both sites, significantly faster than the 30 d leaf–1 calculated using the DA method. The EL method produced the highest estimate of leaf growth, 1.8 and 1.9 cm d–1 at the 0.5 m and 1.5 m sites, respectively, followed by the RM method (1.3 and 1.3 cm d–1) and the DA method (1.0 and 1.1 cm d–1). None of the methods detected differences in leaf PI, leaf growth or leaf fragmentation rates between sites. However, leaves at the 1.5 m site typically retained intact leaf tips longer than those at the 0.5 m site, and total leaf lifespan was longer at the 1.5 m site. Based on these results and the amount of field and laboratory work required by each of the methods, the new EL method is the preferred technique for monitoring leaf growth in S. filiforme.
    Keywords: Biology ; Ecology ; Management
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    Major and trace element analytical methods of the National Status and Trends Program: 2000-2006 (2021)
    NOAA/National Centers for Coastal Ocean Science | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14940 | 403 | 2014-03-17 18:30:31 | 14940 | United States National Ocean Service
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    Publication Date: 2021-06-29
    Description: This document contains analytical methods that detail the procedures for determining major and trace element concentrations in bivalve tissue and sediment samples collected as part of the National Status and Trends Program (NS&T) for the years 2000-2006. Previously published NOAA Technical Memoranda NOS ORCA 71 and 130 (Lauenstein and Cantillo, 1993; Lauenstein and Cantillo, 1998) detail trace element analyses for the years 1984-1992 and 1993-1996, respectively, and include ancillary, histopathology, and contaminant (organic and trace element) analytical methods.The methods presented in this document for trace element analysis were utilized by the NS&T Mussel Watch and Bioeffects Projects. The Mussel Watch Project has been monitoring contaminants in bivalves and sediment for over 20 years, and is the longest active contaminant monitoring program operating in U.S. costal waters. Approximately 280 Mussel Watch sites are monitored on biennial and decadal timescales using bivalve tissue and sediment, respectively. The Bioeffects Project applies the sediment quality approach, which uses sediment contamination measurements, toxicity tests and benthic macroinfauna quantification to characterize pollution in selected estuaries and coastal embayments. Contaminant assessment is a core function of both projects.Although only one contract laboratory was used by the NS&T Program during the specified time period, several analytical methods and instruments were employed. The specific analytical method, including instrumentation and detection limit, is noted for each measurement taken and can be found at http://NSandT.noaa.gov. The major and trace elements measured by the NS&T Program include: Al, Si, Cr, Mn, Fe, Ni, Cu, Zn, As, Se, Sn, Sb, Ag, Cd, Hg, Tl and Pb.
    Keywords: Ecology ; Fisheries ; Pollution
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    A point for comparison: the Flower Garden Banks National Marine Sanctuary (2021)
    In:  http://aquaticcommons.org/id/eprint/14912 | 403 | 2014-03-10 18:15:41 | 14912 | United States National Ocean Service
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    Publication Date: 2021-06-28
    Description: A reoccurring goal listed during the creation of Marine Protected Areas (MPAs) is to return the region to a former state. However, limited data is available that describes or characterizes this former condition. Data collected from ecosystems with comparatively limited anthropogenic impacts, can provide invaluable information in suggesting what former states may have looked like. One example is the Flower Garden Banks National Marine Sanctuary which is located 180 kilometers off the coast of Texas. These relatively isolated and pristine banks are capped by substantial scleractinian coral communities, forming excellent habitat for over 200 species of fish. While fishing is permitted, it is limited by difficulty of access. In 2006, NOAA’s Biogeography Branch, in collaboration with the Sanctuary, initiated the first quantitative assessment of fish resources throughout the diveable portions of the Sanctuary. The sampling design and methodologies employed were identical to those that the Branch has utilized in other more impacted regions of the US Caribbean. Initial analyses reveal that fish density and species richness at the Sanctuary were almost two times greater than that found within the US Caribbean and biomass was approximately six times higher. This was due in large part to the presence of sizeable piscivores of the genera Mycteroperca and Dermatolepis. The Sanctuary is one of few minimally impacted locations remaining within the Tropical Western Atlantic. As such, these findings should be considered when attempting to establish a former state or evaluate effectiveness of an MPA in meeting its management goals.
    Description: Item includes an abstract in Spanish.
    Keywords: Ecology ; Fisheries ; Management ; GCFI
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    Contrasting seasonal patterns in dimethylsulfide, dimethylsulfoniopropionate, and chlorophyll a in a shallow North Carolina estuary and the Sargasso Sea (2021)
    In:  bill.sunda@noaa.gov | http://aquaticcommons.org/id/eprint/14910 | 403 | 2014-03-11 19:18:24 | 14910 | United States National Ocean Service
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    Publication Date: 2021-06-28
    Description: Time series measurements of dimethylsulfide (DMS), particulate dimethylsulfoniopropionate (DMSPp), chlorophyll a (chl a), algal pigments, major nutrients, and the potential activity of DMSP lyase enzymes were made over a 2 yr period (6 March 2003 to 28 March 2005) near the mouth of the shallow, tidally mixed Newport River estuary, North Carolina, USA. DMSPp had a mean of 43 ± 20 nM (range = 10.5 to 141 nM, n = 85) and DMS a mean of 2.7 ± 1.2 nM (range = 0.9 to 7.0 nM). The mean DMS in Gallants Channel was not significantly different from that measured in the Sargasso Sea near Bermuda during a previous 3 yr time series study (2.4 ± 1.5 nM), despite there being a 43-fold higher mean chl a concentration (4.9 ± 2.4 µg l–1) at the coastal site. In winter, DMS was low and chl a was high in the surface waters of the Sargasso Sea, while the opposite was true at the coastal site. Consequently, DMS concentrations per unit algal chl a were on average 170 times higher in the Sargasso Sea than at the coastal site during the summer, but only 7 times higher during the winter. The much higher chl a-specific DMS concentrations at the oceanic site during the summer were linked to higher ratios of intracellular DMSP substrate and DMSP lyase enzyme per unit chl a. These differences in turn appear to be linked to large differences in nutrient concentrations and solar UV stress at the 2 sites and to associated differences in the composition of algal assemblages and physiological acclimation of algal cells.
    Keywords: Chemistry ; Ecology ; Management
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    Bartonella species detection in captive, stranded and free-ranging cetaceans (2021)
    In:  http://aquaticcommons.org/id/eprint/14906 | 403 | 2014-03-10 18:43:53 | 14906 | United States National Ocean Service
    Details
    Publication Date: 2021-06-28
    Description: We present prevalence of Bartonella spp. for multiple cohorts of wild and captive cetaceans. One hundred and six cetaceans including 86 bottlenose dolphins (71 free-ranging, 14 captive in a facility with a dolphin experiencing debility of unknown origin, 1 stranded), 11 striped dolphins, 4 harbor porpoises, 3 Risso's dolphins, 1 dwarf sperm whale and 1 pygmy sperm whale (all stranded) were sampled. Whole blood (n = 95 live animals) and tissues (n = 15 freshly dead animals) were screened by PCR (n = 106 animals), PCR of enrichment cultures (n = 50 animals), and subcultures (n = 50 animals). Bartonella spp. were detected from 17 cetaceans, including 12 by direct extraction PCR of blood or tissues, 6 by PCR of enrichment cultures, and 4 by subculture isolation. Bartonella spp. were more commonly detected from the captive (6/14, 43%) than from free-ranging (2/71, 2.8%) bottlenose dolphins, and were commonly detected from the stranded animals (9/21, 43%; 3/11 striped dolphins, 3/4 harbor porpoises, 2/3 Risso's dolphins, 1/1 pygmy sperm whale, 0/1 dwarf sperm whale, 0/1 bottlenose dolphin). Sequencing identified a Bartonella spp. most similar to B. henselae San Antonio 2 in eight cases (4 bottlenose dolphins, 2 striped dolphins, 2 harbor porpoises), B. henselae Houston 1 in three cases (2 Risso's dolphins, 1 harbor porpoise), and untyped in six cases (4 bottlenose dolphins, 1 striped dolphin, 1 pygmy sperm whale). Although disease causation has not been established, Bartonella species were detected more commonly from cetaceans that were overtly debilitated or were cohabiting in captivity with a debilitated animal than from free-ranging animals. The detection of Bartonella spp. from cetaceans may be of pathophysiological concern.
    Description: Article includes 8 pages.
    Keywords: Ecology ; Fisheries ; Management
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    Anti-grazing properties of the toxic dinoflagellate Karlodinium veneficum during predator-prey interactions with the copepod Acartia tonsa (2021)
    In:  Rebecca.Waggett@noaa.gov | http://aquaticcommons.org/id/eprint/14909 | 403 | 2014-03-10 20:04:12 | 14909 | United States National Ocean Service
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    Publication Date: 2021-06-28
    Description: Karlodinium veneficum (syn. Karlodinium micrum, Bergholtz et al. 2006; J Phycol 42:170–193) is a small athecate dinoflagellate commonly present in low levels in temperate, coastal waters. Occasionally, K. veneficum forms ichthyotoxic blooms due to the presence of cytotoxic, hemolytic compounds, putatively named karlotoxins. To evaluate the anti-grazing properties of these karlotoxins, we conducted food removal experiments using the cosmopolitan copepod grazer Acartia tonsa. Wild-caught, adult female A. tonsa were exposed to 6 monoalgal or mixed algal diets made using bloom concentrations of toxic (CCMP 2064) and non-toxic (CSIC1) strains of K. veneficum. Ingestion and clearance rates were calculated using the equations of Frost (1972). Exposure to the toxic strain of K. veneficum did not contribute to an increased mortality of the copepods and no significant differences in copepod mortality were found among the experimental diets. However, A. tonsa had significantly greater clearance and ingestion rates when exposed to a monoalgal diet of the non-toxic strain CSIC1 than when exposed to the monoalgal diet of toxic strain CCMP 2064 and mixed diets dominated by this toxic strain. These results support the hypothesis that karlotoxins in certain strains of K. veneficum deter grazing by potential predators and contribute to the formation and continuation of blooms.
    Keywords: Ecology ; Fisheries ; Health
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    A pilot survey of deepwater coral/sponge assemblages and their susceptibility to fishing/harvest impacts at the Olympic Coast National Marine Sanctuary (OCNMS). Cruise report for NOAA Ship McARTHUR II Cruise AR-04-04: Leg 2 (June 1-12, 2004) (2021)
    NOAA/National Ocean Service | Charleston, SC
    In:  http://aquaticcommons.org/id/eprint/14592 | 403 | 2014-02-19 23:04:29 | 14592 | United States National Ocean Service
    Details
    Publication Date: 2021-06-29
    Description: The offshore shelf and canyon habitats of the OCNMS are areas of high primary productivity and biodiversity that support extensive groundfish fisheries. Recent acoustic surveys conducted in these waters have indicated the presence of hard-bottom substrates believed to harbor unique deep-sea coral and sponge assemblages. Such fauna are often associated with shallow tropical waters, however an increasing number of studies around the world have recorded them in deeper, cold-water habitats in both northern and southern latitudes. These habitats are of tremendous value as sites of recruitment for commercially important fishes. Yet, ironically, studies have shown how the gear used in offshore demersal fishing, as well as other commercial operations on the seafloor, can cause severe physical disturbances to resident benthic fauna. Due to their exposed structure, slow growth and recruitment rates, and long life spans, deep-sea corals and sponges may be especially vulnerable to such disturbances, requiring very long periods to recover. Potential effects of fishing and other commercial operations in such critical habitats, and the need to define appropriate strategies for the protection of these resources, have been identified as a high-priority management issue for the sanctuary.
    Keywords: Ecology ; Fisheries ; Management
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    Proceedings of the Ninth Annual Pacific Climate (PACLIM) Workshop, Asilomar, California - April 21-24, 1992 [front matter] (2021)
    Interagency Ecological Studies Program for the Sacramento-San Joaquin Estuary
    In:  http://aquaticcommons.org/id/eprint/14593 | 8 | 2014-10-27 22:04:03 | 14593
    Details
    Publication Date: 2021-06-29
    Description: Technical Report 34 of the Interagency Ecological Studies Program for the Sacramento-San Joaquin Estuary
    Keywords: Atmospheric Sciences ; Ecology ; Oceanography ; PACLIM
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    Mapping southern Florida's shallow-water coral ecosystems: an implementation plan (2021)
    NOAA/National Ocean Service | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14608 | 403 | 2014-02-20 18:07:42 | 14608 | United States National Ocean Service
    Details
    Publication Date: 2021-06-29
    Description: The Southern Florida Shallow-water Coral Ecosystem Mapping Implementation Plan (MIP) discusses the need to produce shallow-water (~0-40 m; 0-22 fm) benthic habitat and bathymetric maps of critical areas in southern Florida and moderate-depth (~40-200 m; 22 -109 fm) bathymetric maps for all of Florida. The ~0-40 m depth regime generally represents where most hermatypic coral species are found and where most direct impacts from pollution and coastal development occur. The plan was developed with extensive input from over 90 representatives of state regulatory and management agencies, federal agencies, universities, and non-governmental organizations involved in the conservation and management of Florida’s coral ecosystems. Southern Florida’s coral ecosystems are extensive. They extend from the Dry Tortugas in the Florida Keys as far north as St Lucie Inlet on the Atlantic Ocean coast and Tarpon Springs on the Gulf of Mexico coast. Using 10 fm (18 m) depth curves on nautical charts as a guide, southern Florida has as much as 84 percent (30,801 sq km) of 36,812 sq km of potential shallow-water (〈10 fm; 〈18 m) coral ecosystems the tropical and subtropical U.S. Moreover, southern Florida’s coral ecosystems contribute greatly to the regional economy. Coral ecosystem-related expenditures generated $4.4 billion in sales, income, and employment and created over 70,000 full-time and part-time jobs in the region during the recent 12-month periods when surveys were conducted.
    Keywords: Ecology ; Fisheries ; Management
    Repository Name: AquaDocs
    Type: monograph
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    The effects of size-selective fisheries on the stock dynamics of and sperm limitation in sex-changing fish (2021)
    In:  http://aquaticcommons.org/id/eprint/15027 | 403 | 2014-06-01 19:06:20 | 15027 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-01
    Description: Fisheries models have traditionally focused on patterns of growth, fecundity, and survival of fish. However, reproductive rates are the outcome of a variety of interconnected factors such as life-history strategies, mating patterns, population sex ratio, social interactions, and individual fecundity and fertility. Behaviorally appropriate models are necessary to understand stock dynamics and predict the success of management strategies. Protogynous sex-changing fish present a challenge for management because size-selective fisheries can drastically reduce reproductive rates. We present a general framework using an individual-based simulation model to determine the effect of life-history pattern, sperm production, mating system, and management strategy on stock dynamics. We apply this general approach to the specific question of how size-selective fisheries that remove mainly males will impact the stock dynamics of a protogynous population with fixed sex change compared to an otherwise identical dioecious population. In this dioecious population, we kept all aspects of the stock constant except for the pattern of sex determination (i.e. whether the species changes sex or is dioecious). Protogynous stocks with fixed sex change are predicted to be very sensitive to the size-selective fishing pattern. If all male size classes are fished, protogynous populations are predicted to crash even at relatively low fishing mortality. When some male size classes escape fishing, we predict that the mean population size of sex-changing stocks will decrease proportionally less than the mean population size of dioecious species experiencing the same fishing mortality. For protogynous species, spawning-per-recruit measures that ignore fertilization rates are not good indicators of the impact of fishing on the population. Decreased mating aggregation size is predicted to lead to an increased effect of sperm limitation at constant fishing mortality and effort. Marine protected areas have the potential to mitigate some effects of fishing on sperm limitation in sex-changing populations.
    Keywords: Biology ; Ecology ; Fisheries
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  • 82
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    Sources of age determination errors for sablefish (Anoplopoma fimbria) (2021)
    In:  http://aquaticcommons.org/id/eprint/15036 | 403 | 2014-05-27 14:08:28 | 15036 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-01
    Description: This study was undertaken to resolve problems in age determination of sablefish (Anoplopoma fimbria). Aging of this species has been hampered by poor agreement (averaging less than 45%) among age readers and by differences in assigned ages of as much as 15 years.Otoliths from fish that had been injected with oxytetracycline (OTC) and that had been at liberty for known durations were used to determine why age determinations were so difficult and to help determine the correct aging procedure. All fish were sampled from Oregon southwards, which represents the southern part of their range. The otoliths were examined with the aid of image processing.Some fish showed little or no growth on the otolith after eight months at liberty, whereas otoliths from other fish grew substantially. Some fish lay down two prominent hyaline zones within a single year, one in the summer and one in the winter. We classified the otoliths by morphological type and found that certain types are more likely to lay down multiple hyaline zones and other types are likely to lay down little or no zones. This finding suggests that some improvement could be achieved by detailed knowledge of the growth characteristics of the different types.This study suggests that it may not be possible to obtain reliable ages from sablefish otoliths. At the very least, more studies will be required to under-stand the growth of sablefish otoliths.
    Keywords: Ecology ; Fisheries ; Management
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  • 83
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    Historical nitrogen and phosphorus loadings to the northern Gulf of Mexico (2021)
    NOAA/National Centers for Coastal Ocean Science | Silver Spring, MD
    In:  Dave.Whitall@noaa.gov | http://aquaticcommons.org/id/eprint/14936 | 403 | 2014-03-17 18:52:15 | 14936 | United States National Ocean Service
    Details
    Publication Date: 2021-06-29
    Description: Primary productivity in many coastal systems is nitrogen (N) limited; although, phytoplankton productivity may be limited by phosphorus (P) seasonally or in portions of an estuary. Increases in loading of limiting nutrients to coastal ecosystems may lead to eutrophication (Nixon 1996). Anthropogenically enhanced eutrophication includes symptoms such as loss of seagrass beds, changes in algal community composition, increased algal (phytoplankton) blooms (Richardson et al. 2001), hypoxic or anoxic events, and fish kills (Bricker et al. 2003).
    Keywords: Ecology ; Fisheries ; Pollution
    Repository Name: AquaDocs
    Type: monograph
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  • 84
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    Mission report: a strategy to inventory, characterize, and monitor the marine region within and around the National Park and Monument boundaries of St. John, USVI, July 21- July 31, 2008 (2021)
    NOAA/National Centers for Coastal Ocean Science | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14935 | 403 | 2014-03-17 19:31:47 | 14935 | United States National Ocean Service
    Details
    Publication Date: 2021-06-29
    Description: The intent of this field mission was to continue ongoing efforts: (1) to spatially characterize and monitor the distribution, abundance and size of both reef fishes and conch within and around the waters of the Virgin Islands National Park (VIIS) and newly established Virgin Islands Coral Reef National Monument (VICR), (2) to correlate this information to in-situ data collected on associated habitat parameters, (3) to use this information to establish the knowledge base necessary for enacting management decisions in a spatial setting and to establish the efficacy of those management decisions. This work is supported by the National Park Service and NOAA’s Coral Reef Conservation Program’s Caribbean Coral Reef Ecosystem Monitoring Project. The report highlights the successes of this mission.
    Keywords: Ecology ; Fisheries ; Management
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  • 85
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    A guide to monitoring reef fish in the National Park Service's South Florida/Caribbean Network (2021)
    NOAA/National Ocean Service | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14612 | 403 | 2014-02-20 21:49:50 | 14612 | United States National Ocean Service
    Details
    Publication Date: 2021-06-29
    Description: Reef fishes are conspicuous and essential components of coral reef ecosystems and economies of southern Florida and the United States Virgin Islands (USVI). Throughout Florida and the USVI, reef fish are under threat from a variety of anthropogenic and natural stressors including overfishing, habitat loss, and environmental changes.The South Florida/Caribbean Network (SFCN), a unit of the National Park Service (NPS), is charged with monitoring reef fishes, among other natural and cultural resources, within six parks in the South Florida - Caribbean region (Biscayne National Park, BISC; Buck Island Reef National Monument, BUIS; Dry Tortugas National Park, DRTO; Everglades National Park, EVER; Salt River Bay National Historic Park and Ecological Preserve, SARI; Virgin Islands National Park, VIIS). Monitoring data is intended for park managers who are and will continue to be asked to make decisions to balance environmental protection, fishery sustainability and park use by visitors. The range and complexity of the issues outlined above, and the need for NPS to invest in a strategy of monitoring, modeling, and management to ensure the sustainability of its precious assets, will require strategic investment in long-term, high-precision, multispecies reef fish data that increases inherent system knowledge and reduces uncertainty.The goal of this guide is to provide the framework for park managers and researchers to create or enhance a reef fish monitoring program within areas monitored by the SFCN. The framework is expected to be applicable to other areas as well, including the Florida Keys National Marine Sanctuary and Virgin Islands Coral Reef National Monument. The favored approach is characterized by an iterative process of data collection, dataset integration, sampling design analysis, and population and community assessment that evaluates resource risks associated with management policies. Using this model, a monitoring program can adapt its survey methods to increase accuracy and precision of survey estimates as new information becomes available, and adapt to the evolving needs and broadening responsibilities of park management.
    Keywords: Ecology ; Fisheries ; Management
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  • 86
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    Temporal and spatial aspects of bottlenose dolphin occurrence in coastal and estuarine waters near Charleston, South Carolina (2021)
    NOAA/National Ocean Service | Charleston, SC
    In:  http://aquaticcommons.org/id/eprint/14611 | 403 | 2014-02-20 21:40:04 | 14611 | United States National Ocean Service
    Details
    Publication Date: 2021-06-29
    Description: The spatial and temporal occurrence of Atlantic bottlenose dolphins (Tursiops truncatus) in the coastal and estuarine waters near Charleston, SC were evaluated. Sighting and photographic data from photo-identification (ID), remote biopsy, capture-release and radio-tracking studies, conducted from 1994 through 2003, were analyzed in order to further delineate residence patterns of Charleston area bottlenose dolphins. Data from 250 photo-ID, 106 remote biopsy, 15 capture-release and 83 radio-tracking surveys were collected in the Stono River Estuary (n = 247), Charleston Harbor (n = 86), North Edisto River (n = 54), Intracoastal Waterway (n = 26) and the coastal waters north and south of Charleston Harbor (n = 41). Coverage for all survey types was spatially and temporally variable, and in the case of biopsy, capture-release and radio-tracking surveys, data analyzed in this report were collected incidental to other research. Eight-hundred and thirty-nine individuals were photographically identified during the study period. One-hundred and fifteen (13.7%) of the 839 photographically identified individuals were sighted between 11-40 times, evidence of consistent occurrence in the Charleston area (i.e., site fidelity). Adjusted sighting proportions (ASP), which reflect an individual’s sighting frequency in a subarea relative to other subareas after adjusting for survey effort, were analyzed in order to evaluate dolphin spatial occurrence. Forty-three percent (n = 139) of dolphins that qualified for ASP analyses exhibited a strong subarea affiliationwhile the remaining 57% (n = 187) showed no strong subarea preference. Group size data were derived from field estimates of 2,342 dolphin groups encountered in the five Charleston subareas. Group size appeared positively correlated with degree of “openness” of the body of water where dolphins were encountered; and for sightings along the coast, group size was larger during summer months. This study provides valuable information on the complex nature of bottlenose dolphin spatial and temporal occurrence near Charleston, SC. In addition, it helps us to better understand the stock structure of dolphins along the Atlantic seaboard.
    Keywords: Biology ; Ecology ; Fisheries ; Management
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  • 87
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    Estuarine use assessment: trial project in Casco Bay, Maine (2021)
    NOAA/National Ocean Service | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14616 | 403 | 2014-02-20 22:17:15 | 14616 | United States National Ocean Service
    Details
    Publication Date: 2021-06-29
    Description: The National Centers for Coastal Ocean Science (NCCOS) of the National Oceanic and Atmospheric Administration (NOAA) is interested in developing a project to determine the health of estuaries based on the stated or desired uses of society. An estuarine use assessment could complement the National Coastal Assessment, which tracks coastal and estuarine health through a series of environmental indicators. These indicators are used to assign a “score” to each coastal region, with some indicators reflecting the ability of the region to support desired uses such as fishing and swimming. An estuarine use assessment could also provide valuable information to resource managers and other decision-makers as they face decisions about the optimal and most sustainable mix of activities in an estuary.An initial step of an estuarine use assessment would be to define and quantify the desired societal uses of the estuary. Society includes residents living near the estuary or industries relying on the estuary, seasonal residents and tourists that use the estuary on a more limited basis, and the public at-large that may use or value the estuary indirectly. The desired uses may include discrete, visible uses such as swimming, recreational or commercial fishing, and navigation. They also may extend to broader, more intangible uses such as maintaining ecological functions or aesthetic appeal. National legislation such as the Estuary Restoration Act, which promotes and funds the restoration of estuaries in the U.S., reflects the public’s desire for estuaries to retain their ecological structures and functions.This report summarizes a project carried out in 2003 that attempted to quantify the desired human uses of a specific estuary in Maine and to determine current measures of success used by coastal managers in Maine to track the ability of the estuary to support desired uses. Casco Bay was chosen as the spatial embayment for which to delineate uses, and nutrient enrichment was selected as the parameter for confirming assumptions about current measures of outcomes related to uses. The report highlights some of the challenges to completing an estuarine use assessment and offers general recommendations for addressing these challenges.
    Keywords: Ecology ; Fisheries ; Management
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  • 88
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    Human use pharmaceuticals in the estuarine environment: a survey of the Chesapeake Bay, Biscayne Bay, and Gulf of the Farallones (2021)
    NOAA/National Ocean Service | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/14614 | 403 | 2014-02-20 22:12:24 | 14614 | United States National Ocean Service
    Details
    Publication Date: 2021-06-29
    Description: The assessment of emerging risks in the aquatic environment is a major concern and focus of environmental science (Daughton and Ternes, 1999). One significant class of chemicals that has received relatively little attention until recently are the human use pharmaceuticals. In 2004, an estimated 2.6 billion prescriptions were written for the top 300 pharmaceuticals in the U.S. (RxList, 2005). Mellon et al. (2001) estimated that 1.4 million kg of antimicrobials are used in human medicine every year. The use of pharmaceuticals is also estimated to be on par with agrochemicals (Daughton and Ternes, 1999). Unlike agrochemicals (e.g., pesticides) which tend to be delivered to the environment in seasonal pulses, pharmaceuticals are continuously released through the use/excretion and disposal of these chemicals, which may produce the same exposure potential as truly persistent pollutants. Human use pharmaceuticals can enter the aquatic environment through a number of pathways, although the main one is thought to be via ingestion and subsequent excretion byhumans (Thomas and Hilton, 2004). Unused pharmaceuticals are typically flushed down the drain or wind up in landfills (Jones et al. 2001).
    Keywords: Ecology ; Fisheries ; Management ; Pollution
    Repository Name: AquaDocs
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  • 89
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    Spatial and temporal analysis of bottlenose dolphin strandings in South Carolina, 1992-2005 (2021)
    NOAA/National Ocean Service | Charleston, SC
    In:  http://aquaticcommons.org/id/eprint/14618 | 403 | 2014-02-21 21:41:50 | 14618 | United States National Ocean Service
    Details
    Publication Date: 2021-06-30
    Description: This CD contains summary data of bottlenose dolphins stranded in South Carolina using a Geographical Information System (GIS) and contains two published manuscripts in .pdf files. The intent of this CD is to provide data on bottlenose dolphin strandings in South Carolina to marine mammal researchers and managers.This CD is an accumulation of 14 years of stranding data collected through the collaborations of the National Ocean Service, Center for Coastal Environmental Health and Biomolecular Research (CCEHBR), the South Carolina Department of Natural Resources, and numerous volunteers and veterinarians that comprised the South Carolina Marine Mammal Stranding Network.Spatial and temporal information can be visually represented on maps using GIS. For this CD, maps were created to show relationships of stranding densities with land use, human population density, human interaction with dolphins, high geographical regions of live strandings, and seasonal changes. Point maps were also created to show individual strandings within South Carolina.In summary, spatial analysis revealed higher densities of bottlenose dolphin strandings in Charleston and Beaufort Counties, which consist of urban land with agricultural input. This trend was positively correlated with higher human population levels in these coastal counties as compared with other coastal counties. However, spatial analysis revealed that certain areas within a county may have low human population levels but high stranding density, suggesting that the level of effort to respond to strandings is not necessarily positively correlated with the density of strandings in South Carolina.Temporal analysis revealed a significantly higher density of bottlenose dolphin strandings in the northern portion of the State in the fall, mostly due to an increase of neonate strandings. On a finer geographic scale, seasonal stranding densities may fluctuate depending on the region of interest.Charleston Harbor had the highest density of live bottlenose dolphin strandings compared to the rest of the State. This was due in large part to the number of live dolphin entanglements in the crab pot fishery, the largest source of fishery-related mortality for bottlenose dolphins in South Carolina (Burdett and McFee 2004). Spatial density calculations also revealed that Charleston and Beaufort accounted for the majority of dolphins that were involved with human activities.1
    Keywords: Ecology ; Fisheries ; Management
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  • 90
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    Nueva especie del género Mugil (Pisces: Mugilidae) de aguas cubanas. (2021)
    In:  alajonchere@gmail.com | http://aquaticcommons.org/id/eprint/14959 | 1545 | 2014-04-05 21:45:07 | 14959
    Details
    Publication Date: 2021-06-29
    Description: A new species of mullet (Mugil) from Nipe Bay. North coast of Oriente Province, Cuba. The absence of axillary scale of pectoral fins, a very slender body and a notably elongated caudal peduncle are among the most diagnostic features of a new species.
    Keywords: Ecology ; new species mugil longicauda
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  • 91
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    The use of parasites in discriminating stocks of Pacific halibut (Hippoglossus stenolepis) in the northeast Pacific (2021)
    In:  http://aquaticcommons.org/id/eprint/15101 | 403 | 2014-05-28 03:37:46 | 15101 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-02
    Description: The use of parasites as indicators of the stock structure of Pacific halibut (Hippoglossus stenolepis) in the northeast Pacific was investigated by using 328 adult (〉55 cm fork length) halibut from 15 composite localities ranging from northern California to the northern Bering Sea and 96 juvenile (10–55 cm) halibut from five localities ranging from the northern Queen Charlotte Islands to the Bering Sea. Counts of eight selected parasite species (the juvenile acanthocephalans Corynosoma strumosum and C. villosum, the metacestode Nybelinia surmenicola, the digenean metacercaria Otodistomum sp., and the larval nematodes Anisakis simplex, Pseudoterranova decipiens, Contracaecum sp., and Spirurid gen. sp.) that produce infections of long duration, do not multiply in the host, and that have a relatively high abundance in at least one geographic locality were subjected to discriminant function analysis. Juvenile Pacific halibut showed no separation and, even though they were not heavily infected with parasites, the analysis suggested that juveniles could be a mixed stock. Three groups of adults were identified: fish from California to the southern Queen Charlotte Islands, those from the northern Queen Charlotte Islands to the central Bering Sea, and those from the central and north-ern Bering Sea. These groups suggest that the single stock concept be more thoroughly evaluated.
    Keywords: Ecology ; Fisheries
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  • 92
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    Descriptions of larval, prejuvenile, and juvenile finescale menhaden (Brevoortia gunteri) (family Clupeidae), and comparisons to gulf menhaden (B. patronus) (2021)
    In:  http://aquaticcommons.org/id/eprint/15096 | 403 | 2014-05-28 03:31:08 | 15096 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-02
    Description: Larval and juvenile development of finescale menhaden (Brevoortia gunteri) is described for the first time by using wild-caught individuals from Nueces Bay, Texas, andis compared with larval and juvenile development of co-occurring gulf menhaden (B. patronus). Meristics,morphometrics, and pigmentation patterns were examined as development proceeded. An illustrated series of finescale menhaden is presented to show changes that occurred duringdevelopment. For finescale menhaden, transformation to the juvenile stage was completed by 17−19 mm standard length (SL). By contrast, transformation to the juvenile stage for gulf menhaden was not complete until 23−25 mm SL. Characteristics useful for separating larval and juvenile finescale menhaden from gulf menhaden included 1) the presence or absence of pigment at the base of the insertion of the pelvic fins; 2) the standard length at which medial predorsal pigment occurs; 3) differences in the number of dorsal fin ray elements; and, 4) the number of vertebrae.
    Keywords: Ecology ; Fisheries
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  • 93
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    The Hudson-Raritan Estuary as a crossroads for distribution of blue (Callinectes sapidus), lady (Ovalipes ocellatus), and Atlantic rock (Cancer irroratus) crabs (2021)
    In:  http://aquaticcommons.org/id/eprint/15094 | 403 | 2014-05-28 03:29:51 | 15094 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-02
    Description: Blue (Callinectes sapidus)(Portunidae),lady (Ovalipes ocellatus)(Portunidae), and Atlantic rock (Cancer irroratus) (Cancridae) crabs inhabit estuaries on the northeast United States coast for parts or all of their life cycles. Their distributions overlap or cross during certain seasons. During a 1991–1994 monthly otter trawl survey in the Hudson-Raritan Estuary between New York and New Jersey, blue and lady crabs were collected in warmermonths and Atlantic rock crabs in colder months. Sex ratios, male:female, of mature crabs were 1:2.0 for blue crabs, 1:3.1 for lady crabs, and 21.4:1 for Atlantic rock crabs. Crabs, 1286 in total, were subsampled for dietary analysis, and the dominant prey taxa for all crabs, by volume of foregut contents, were mollusks and crustaceans. The proportion of amphipods and shrimp in diets decreased as crab size increased. Trophic niche breadth was widest forblue crabs, narrower for lady crabs, and narrowest for Atlantic rock crabs. Trophic overlap was lowest betweenlady crabs and Atlantic rock crabs, mainly because of frequent consumption of the dwarf surfclam (Mulinialateralis) by the former and the blue mussel (Mytilus edulis) by the latter. The result of cluster analysis showedthat size class and location of capture of predators in the estuary were more influential on diet than the speciesor sex of the predators.
    Keywords: Ecology ; Fisheries ; Management
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    Diet of the minimal armhook squid (Berryteuthis anonychus) (Cephalopoda: Gonatidae) in the northeast Pacific during spring (2021)
    In:  http://aquaticcommons.org/id/eprint/15097 | 403 | 2014-05-28 03:32:22 | 15097 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-02
    Description: The stomach contents of the minimal armhook squid (Berryteuthis anonychus) were examined for 338 specimens captured in the northeast Pacific during May 1999. The specimens were collected at seven stations between 145−165°W and 39−49°N and ranged in mantle length from 10.3 to 102.2 mm. Their diet comprised seven major prey groups (copepods, chaetognaths, amphipods, euphausiids, ostracods, unidentified fish, and unidentified gelatinous prey) and wasdominated by copepods and chaetognaths. Copepod prey comprised four genera, and 86% by number of the copepods were from the genus Neocalanus. Neocalanus cristatus was themost abundant prey taxa, composing 50% by mass and 35% by number of the total diet. Parasagitta elegans (Chaetognatha) occurred in more stomachs (47%) than any other prey taxon. Amphipods occurred in 19% of the stomachs but composed only 5% by number and 3% by mass of the totalprey consumed. The four remaining prey groups (euphausiids, ostracods, unidentified fish, and unidentified gelatinous prey) together composed 〈2% by mass and 〈1% by number ofthe diet. There was no major change in the diet through the size range of squid examined and no evidence of cannibalism or predation on other cephalopod species.
    Keywords: Ecology ; Fisheries
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  • 95
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    Small-scale spatial and temporal variability in growth and mortality of fish larvae in the subtropical northcentral Gulf of Mexico: implications for assessing recruitment success (2021)
    In:  http://aquaticcommons.org/id/eprint/15102 | 403 | 2014-05-28 03:38:25 | 15102 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-02
    Description: Extensive plankton collections were taken during seven September cruises (1990–93) along the inner continental shelf of the northcentral Gulf of Mexico (GOM). Despite the high productivity and availability of food during these cruises, significant small-scale spatial variability was found in larval growth rates for both Atlantic bumper (Chloroscombrus chrysurus, Carangidae) and vermilion snapper (Rhomboplites aurorubens, Lutjanidae). The observed variability in larval growth rates was not correlated with changes in water temperature or associated with conspicuous hydrographic features and suggested the existence of less-recognizable regions where conditions for growth vary. Cruise estimates of mortality coefficients (Z) for larval Atlantic bumper (n=32,241 larvae from six cruises) and vermilion snapper (n= 2581 larvae from four cruises) ranged from 0.20 to 0.37 and 0.19 to 0.29, respectively. Even in a subtropical climate like the GOM, where larval-stage durations may be as short as two weeks, observed variability in growth rates, particularly when combined with small changes in mortality rates, can cause order-of-magnitude differences in cumulative larval survival. To what extent the observed differences in growth rates at small spatial scales are fine-scale “noise” that ultimately is smoothed by larger-scale processes is not known. Future research is needed to further characterize the small-scale variability in growth rates of larvae, particularly with regard to microzooplankton patchiness and the temporal and spatial pattern of potential predators. Small-scale spatial variability in larval growth rates may in fact be the norm, and understanding the implications of this subtle mosaic may help us to better evaluate our ability to partition the causes of recruitment variability.
    Keywords: Ecology ; Fisheries ; Management
    Repository Name: AquaDocs
    Type: article , TRUE
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    Format: application/pdf
    Format: 10-21
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    Capture probability of a survey trawl for red king crab (Paralithodes camtschaticus) (2021)
    In:  http://aquaticcommons.org/id/eprint/15098 | 403 | 2014-05-28 03:33:32 | 15098 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-02
    Description: The relative abundance of Bristol Bay red king crab (Paralithodes camtschaticus) is estimated each year for stock assessment by using catch-per-swept-area data collected on the Alaska Fisheries Science Center’s annual eastern Bering Sea bottom trawl survey. To estimate survey trawl capture efficiency for red king crab, an experiment was conducted with an auxiliary net (fitted with its own heavy chain-link footrope) that was attached beneath thetrawl to capture crabs escaping under the survey trawl footrope. Capture probability was then estimated by fitting a model to the proportion of crabs captured and crab size data. For males, mean capture probability was 72% at 95 mm (carapace length), the size at which full vulnerability tothe survey trawl is assigned in the current management model; 84.1% at 135 mm, the legal size for the fishery;and 93% at 184 mm, the maximum size observed in this study. For females, mean capture probability was 70% at 90 mm, the size at which full vulnerability to the survey trawl isassigned in the current management model, and 77% at 162 mm,the maximum size observed in this study. The precision of our estimates for each sex decreased for juveniles under 60 mm and for the largest crab because of small sample sizes.In situ data collected from trawl-mounted video cameras were used to determine the importance of various factors associated with the capture of individual crabs. Capture probability was significantly higher when a crab was standing when struck by the footrope, rather than crouching, and higher when a crab was hit along its body axis, rather than from the side. Capture probability also increased as a function of increasing crab size butdecreased with increasing footrope distance from the bottom and when artificial light was provided for the video camera.
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 740-749
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    Life history of the Atlantic sharpnose shark (Rhizoprionodon terraenovae) (Richardson, 1836) off the southeastern United States (2021)
    In:  http://aquaticcommons.org/id/eprint/15107 | 403 | 2014-05-28 03:43:18 | 15107 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-02
    Description: The life history of the Atlantic sharpnose shark (Rhizoprionodon terraenovae) was described from 1093 specimens collected from Virginia to northern Florida between April 1997 and March 1999. Longitudinally sectioned vertebral centra were used to age each specimen, and the periodicity of circuli deposition was verified through marginal increment analysis and focus-to-increment frequency distributions. Rhizoprionodon terraenovae reached a maximum size of 828 mm precaudal length (PCL) and a maximum age of 11+ years. Mean back-calculated lengths-at-age ranged from 445 mm PCL at age one to 785 mm PCL at age ten for females, and 448 mm PCL at age one to 747 mm PCL at age nine for males. Observed lengthat-age data (estimated to 0.1 year) yielded the following von Bertalanffy parameters estimates: L∞= 749 mm PCL (SE=4.60), K = 0.49 (SE=0.020), and t0= –0.94 (SE=0.046) for females; and L∞= 745 mm PCL (SE = 5.93), K = 0.50 (SE=0.024), and t0= –0.91 (SE = 0.052) for males. Sexual maturity was reached at age three and 611 mm PCL for females, and age three and 615 mm PCL for males. Rhizoprionodon terraenovae reproduced annually and had a gestation period of approximately 11 months. Litter size ranged from one to eight (mean=3.85) embyros, and increased with female PCL.
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
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    Format: application/pdf
    Format: 75-88
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    Use of parasites in stock identification of the deepwater redfish (Sebastes mentella) in the Northwest Atlantic (2021)
    In:  http://aquaticcommons.org/id/eprint/15115 | 403 | 2014-05-28 03:50:59 | 15115 | United States National Marine Fisheries Service
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    Publication Date: 2021-07-03
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 183-188
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    Dive-depth distribution of loggerhead (Caretta caretta) and olive ridley (Lepidochelys olivacea) sea turtles in the central North Pacific: Might deep longline sets catch fewer turtles? (2021)
    In:  http://aquaticcommons.org/id/eprint/15116 | 403 | 2014-05-28 03:52:02 | 15116 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-03
    Keywords: Ecology ; Fisheries ; Management
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 189-193
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  • 100
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    Seasonal distribution, abundance, and growth of young-of-the-year Atlantic croaker (Micropogonias undulatus) in Delaware Bay and adjacent marshes (2021)
    In:  http://aquaticcommons.org/id/eprint/15109 | 403 | 2014-05-28 03:45:00 | 15109 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-02
    Description: We examined the spatial and temporal distribution, abundance, and growth of young-of-the-year (YOY) Atlantic croaker (Micropogonias undulatus) in Delaware Bay, one of the northernmost estuaries in which they consistently occur along the east coast of the United States. Sampling in Delaware Bay and in tidal creeks in salt marshes adjacent to the bay with otter trawls, plankton nets and weirs, between April and November 1996–99, collected approximately 85,000 YOY. Ingress of each year class into the bay and tidal creeks consistently occurred in the fall, and the first few YOY appeared in August. Larvae as small as 2–3 mm TL were collected in September and October 1996. Epibenthic individuals 〈25 mm TL were present each fall and again during spring of each year, but not in 1996 when low water temperatures in January and February apparently caused widespread mortality, resulting in their absence the following spring and summer. In 1998 and 1999, a second size class of smaller YOY entered the bay and tidal creeks in June. When YOY survived the winter, there was no evidence of growth until after April. Then the YOY grew rapidly through the summer in all habitats (0.8–1.4 mm/d from May through August). In the bay, they were most abundant from June to August over mud sediments in oligohaline waters. They were present in both subtidal and intertidal creeks in the marshes where they were most abundant from April to June in the mesohaline portion of the lower bay. The larger YOY began egressing out of the marshes in late summer, and the entire year class left the tidal creeks at lengths of 100–200 mm TL by October or November when the next year class was ingressing. These patterns of seasonal distribution and abundance in Delaware Bay and the adjacent marshes are similar to those observed in more southern estuaries along the east coast; however, growth is faster—in keeping with that in other northern estuaries.
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 100-115
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