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  • Limnology  (55)
  • Cell & Developmental Biology
  • General Chemistry
  • National Rivers Authority North West  (30)
  • Gainesville, FL  (25)
  • 2020-2022  (55)
  • 1975-1979
  • 1945-1949
  • 1920-1924
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  • 2020-2022  (55)
  • 1975-1979
  • 1945-1949
  • 1920-1924
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  • 1
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    The effect of abstraction on fish and fisheries (2021)
    National Rivers Authority North West | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10972 | 1256 | 2013-03-26 13:52:57 | 10972 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-25
    Description: This is the report on the Effect of Abstraction on Fish and Fisheries presented at the 24th IFM Annual Study Course, The Changing Face of Fisheries September 1993 at Cardiff.Water is abstracted from rivers for a wide variety of uses and causing potential for conflicts between abstracters, fisheries and conservation interests, especially during natural low flows. It looks at the potential effects that flow reduction has over various stages of salmonids at various stages of their life history. The flow at the time of smolt migration has been found to be positively correlated with the number of returning adults, and flow is considered to be one of the most important environmental factors inducing salmonids to enter fresh water and ascend rivers. The importance of time series data on fish stocks and angling success together with models which ultimately relate discharge to standing stock are discussed in relation to the setting up of Minimum Acceptable Flows.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; Management ; England ; National River Authority ; Water abstractions ; Environmental assessment ; Population dynamics ; Salmonids ; Minimum Acceptable Flows ; Migratory Fish
    Repository Name: AquaDocs
    Type: monograph
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  • 2
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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
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    Type: monograph
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  • 3
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    River Ehen and Calder sub catchment Management Plan (2021)
    National Rivers Authority North West | UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/10955 | 1256 | 2013-03-26 13:56:21 | 10955 | Environment Agency, UK (Freshwater Biological Association)
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    Publication Date: 2021-06-25
    Description: This is the River Ehen and Calder sub catchment management plan: Consultation Report September 1993 produced by the National Rivers Authority (NRA) North West Region in 1993. The report focuses on the management plan of both River Catchments Ehen and Calder, in North West England, UK. The Catchment Management Plan (C.M.P.) enabled the NRA to summarise the status of the catchment, identify the main issues and present its vision of the future. It provides a strategic policy framework for its Management and influences decision making leading to improvements in the water environment. The report contains sections on Description of Catchment, Catchment uses by NRA function, Target and objectives of the plan, Summary of Issues and Catchment Issues. The section on description of Catchment includes a general description, Transport, Geology, major services, summary of key details, area, topography, administrative details, main towns and population, water quality Sewage Treatment Works Trade effluent discharges, Water Resources, flood defence and land drainage and Fisheries.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; Management ; England ; Ehen ; Calder ; Inland waters ; Coastal waters ; Rivers ; Freshwater lakes ; Freshwater pollution ; Migratory species ; Fish stocks ; Fisheries ; Nature conservation ; Water management ; Water quality
    Repository Name: AquaDocs
    Type: monograph
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    Format: 58
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  • 4
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    Central area fisheries annual report 1994 (2021)
    National Rivers Authority North West | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8509 | 1256 | 2012-12-21 15:37:01 | 8509 | Environment Agency, UK (Freshwater Biological Association)
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    Publication Date: 2021-07-03
    Description: The purpose of this report is to record key events/data and to outline the activities of the NRA Central Area Fisheries Function during 1994. The Rivers looked at include the Ribble, Lune, Hodder and Wyre. The issues that the report looks at includes Hydrological and meterological data, catch data for salmon and sea trout, fish kills, and fish stocking. It also lists the Micro-tag returns for 1994 and the six key objectives that the Central Area Fisheries Function has set itself for 1995. The report uses a range of different graphs and tables to display their data.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Rivers ; River fisheries ; Coarse fish ; Salmo salar ; Salmo trutta ; Stream flow ; Catch statistics ; Stock assessment ; Fish counters ; licensing
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    Type: monograph
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    Format: 49
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  • 5
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    Analysis of Hydrologic Data for the White River Basin (2021)
    University of Florida, Florida Cooperative Fish and Wildlife Research Unit | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1001 | 3 | 2011-09-29 21:17:28 | 1001 | Florida Cooperative Fish and Wildlife Research Unit
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    Publication Date: 2021-07-05
    Description: The value of the natural resources of the White River Basin (Basin), AR isrecognized by the area's designation as a "Wetland of International Importance". TheBasin constitutes one of the Nation's largest remaining intact forested wetlandlandscapes, second only to the Atchafalya Basin. It supports the North Americancontinent's largest concentration of over-wintering mallard ducks, a world-class troutfishery, the last vestige of a big river fishery remaining in the Mississippi River Basin,and numerous threatened and endangered species. The continued viability of thiswetland ecosystem depends on the suitability of the hydrologic environment to theresident flora and fauna. Numerous modifications of the Basin hydrologic features in thepast century have seriously impaired the sustainability of these resources. The Basinwidealterations of hydrologic processes (e.g., impoundment and regulatory releases offlows and volumes in the upper reaches, navigational modifications of lower reaches, andconsumptive demands for agricultural use throughout) have affected the hydrology of thesystem profoundly. The result is highly regulated flows and stages, vastly alteredhydrologic patterns, over-stabilized water levels, and disruption of seasonal waterdistribution patterns. Given the critical nature of hydrology in regulating the structureand function of wetland ecosystems, the impacts have been devastating, particularly tothe critical bottomland hardwoods that support the Basin's fish and wildlife resources.To date these piece-meal, system-wide, hydrologic alterations have cornmutativelydegraded the habitat value of this resource for fish and wildlife in the Basin, and havelead to changes in their numbers and distributions. In spite of the enormous stakesinvolved, there has been no comprehensive characterization of the Basin hydrology.System alterations such as channel deepening, dam construction, water allocationplans, and flood control measures are currently pending. These projects will potentiallyhrther modify the hydrologic environments of the Basin, and no doubt require mitigationmeasures. In addition, there is genuine interest in restoring aspects of the Basin's historichydrologic regime within some set of reasonable limits. In order to proceed with thiseffort, the anticipated effects of these modifications and restorations on the Basin ecologyrequire thorough study of the area's historic hydrology, so that connectivity among Basinprecipitation patterns, flow fluctuations, and land use changes can be made. A basinhydrologic characterization is an initial component of this effort. The focus of this effortwas to determine and assemble the data set from which characterization of the hydrologicenvironments of the Basin using historic and recent water level, flow, (primarily byUSGS-WRD) at locations throughout the Basin could proceed. ( Document has 11 pages.)
    Description: Research Work Order no. 203
    Keywords: Conservation ; Biology ; Limnology ; Environment ; Policies ; White River Basin ; Arkansas ; hydrology ; species
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  • 6
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    Spatial and Temporal Changes in Tree Islands of the Arthur R. Marshall Loxahatchee National Wildlife Refuge in Response to Altered Hydrologies (2021)
    Florida Cooperative Fish and Wildlife Research Unit, University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1063 | 3 | 2011-09-29 21:12:04 | 1063 | Florida Cooperative Fish and Wildlife Research Unit
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    Publication Date: 2021-07-05
    Description: Loxahatchee can be grouped into three zones according to the patterns of change of treeislands observed from 1950 to 1991. 1 ) the edge ofthe refuge adjacent to the canals, 2) the eastern interiorof the refuge, and 3) the western interior ofthe refuge. The general trend is for tree islandsAlong the edge of the refuge to have decreased insize, number, and percent cover, while those on theinterior increased in size, nunber, and percentcover.Results from this study illustrate the importanceof flow magnitude as well as hydroperiodand depth in stucturing patterns of tree islandswithin this peat wetland. Restoration of historichydroperiods and depths without historic flow patternsmay not be sufficient to restore or maintainthe historic pattern and function of the system. (60 pages)
    Keywords: Conservation ; Biology ; Limnology ; Arthur R. Marshall Loxahatchee National Wildlife Refuge ; Florida ; hydrology ; tree islands ; water regimes
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  • 7
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    Multimodeling Basis for Across-Trophic-Level Ecosystem Modeling: the Florida Everglades Example (2021)
    Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1071 | 3 | 2011-09-29 21:11:25 | 1071 | Florida Cooperative Fish and Wildlife Research Unit
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    Publication Date: 2021-07-05
    Description: We present a new modeling method for use in large-scale physical systems, such as the Everglades ecosystem.The current work that has been done in the ATLSS (Across-Trophic-Level System Simulation) project-whichfocuses on simulating key Everglades system components-relies on code integration. While this represents anecessary first step in analyzing the dynamics of species within the Everglades, it falls short of true modelintegration. We have constructed a methodology called object-oriented physical modeling (OOPM), which allowsa comprehensive knowledge representation to be constructedfor large-scale systems. OOPM enforces theidea that an implementation ofcomputer code can be accomplished in an incremental fashion by starting with aconceptual model and progressing to more detailed models. During this evolutionary procedure, a minimal amountof code is written, since the emphasis is on developing the conceptual model so that it not only represents theintuitive aspects ofthe model, but is also executable. OOPM provides a kind of "blueprint" for ecologists, biologistsand hydrologists to communicate and integrate models effectively. (14 page document)
    Keywords: Conservation ; Management ; Engineering ; Limnology ; Everglades ; Florida ; ecosystem ; modeling ; ATLSS (Across-Trophic-Level System Simulation) ; restoration
    Repository Name: AquaDocs
    Type: article
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    Format: 76-89
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  • 8
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    Evaluation the ecological role of alligator holes in the Everglades landscape (2021)
    Department of Wildlife Ecology and Conservation, Everglades Research and Education Center, University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1117 | 3 | 2011-09-29 21:06:20 | 1117 | Florida Cooperative Fish and Wildlife Research Unit
    Details
    Publication Date: 2021-07-05
    Description: The purpose of this project was to conduct a pilot project to determine the feasibility ofperforming a study to evaluate the ecological role of alligator holes in the Everglades system andto develop interagency support and a scope of work for future studies. The objectives for the firstyear were to: 1. Review existing information on the ecology of alligator holes and conduct a survey oncurrent complimentary studies.2. Conduct an ecological survey. including mapping and description. of existing alligatorholes.3. Establish interagency cooperation and support for an Alligator Hole Project. Based onthis interagency consultation develop a consensus for priorities for future research andintegration into ecosystem restoration efforts.(96 page document)
    Description: Final annual report for year 1. Submitted to: Everglades Agricultural Area Environmental Protection District
    Keywords: Biology ; Limnology ; alligator holes ; Everglades ; Florida
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  • 9
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    Productivity of Florida Springs: first semi-annual report to Biology Division, Office of Naval Research, progress from June 1, 1952 to January 31, 1953 (2021)
    University of Florida, College of Arts and Sciences, Department of Biology | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/369 | 3 | 2011-09-29 22:09:52 | 369
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    Publication Date: 2021-06-29
    Description: Work has begun on studying the factors responsible for productivityin the Florida springs, which are nearly constant temperature, constantchemical, steady state giant laboratories. Progress has been made on fiveaspects: qualitative description, quantitative description, completionof knowledge of chemical factors, measurement of productivity , developmentof productivity theory.Measurement of the primary productivity in Silver Springs and GreenCove Springs by two new methods: the raising of organisms in cages, and themeasurement of night & day differences in oxygen downstream agree roughly.Production in these springs is greater than previous production figures reportedfor marine, fresh water, and land areas. Instantaneous measures of production show large variations with season, time of day, cloud cover. Productionestimates range from 11,000 lbs per acre per year to 70,000 lbs. glucose peracre per year during daylight hours.Essential stability of the springs environment has been shown withrespect to temperature, phosphorus, and plant cover. A correlation of speciesnumber with lack of stability has been shown with insects. Quantitativestudies have shown very large plant base to pyramids of mass. Correlationof marine invasion with chlorinity has been shown. The essential aspects ofpH regulated phosphorus geochemistry in Florida have been outlined. Sometheoretical ideas on productivity have been evolved. Mapping of sessileorganisms in springs and taxonomic identification of dominants are halfcompleted. Plans for second six months include measurement of herbivoreand carnivore production rates and completion of food chain efficiencydeterminations in Silver Springs as a preparation for subsequentcomparisons between springs. (34pp.)
    Keywords: Ecology ; Limnology ; springs ; Florida ; productivity
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  • 10
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    Productivity of Florida Springs: third annual report to Biology Branch, Office of Naval Research progress from January 1 to December 31, 1955 (2021)
    University of Florida, Department of Biology | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/374 | 3 | 2011-09-29 22:09:16 | 374
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    Publication Date: 2021-06-29
    Description: The effect of productivity on species variety has been studied by countsof diatom species on glass slides at favorable and unfavorable stations withinSilver Springs. Species variety has been presented in a measure that is independentof sample size, "species per cycle". This measure is based on the linear increase of accumulated species with logarithmic increase of individuals counted, which has been found approximately true for many kinds of populations in many communities. Diatom productivity was measured by the rate of chlorophyll accumulation. The poor station accumulated diatoms and chlorophyll slowly and was characterized by a large species variety. There was little change after 79 days. The rich station accumulated diatoms and chlorophyll rapidly and was characterized by a small species variety that decreased for 93 days as the density of the population increased. These results indicated that species variet was decreased by conditions of high productivity possibly through the action of high densities and competition.Twelve new diurnal production curves were obtained including two more on Silver Springs and one each for 10 different Florida Springs. A shallow oligohaline spring possessed the highest productivity of 58.0 gm/m2/day; a shaded and anerobic spring possessed the lowest producvitiy of 0.66 gm /m2/day. Findings in further studies in Silver Springs indicated a two fold diurnal chlorophyll fluctuation in the pseudoplankton going downstream, photosynthetic quotients corresponding to carbohydrate production on winter or heavily clouded days, and higher quotients corresponding to protein production on sunny, summer days; evidences that bell jar estimates of respiration in flowing water communities lead to underestimates; recalculation of mean depth of plant beds leads to a 5% estimate of photosynthetic efficiency for Silver Springs (rather than 8%). Correlated with a 20% decrease in the discharge associated with widespread drought in 1954-55 the oxygen of the main boil dropped from 2.5 ppm to 1.7 ppm. A production measurement by the diurnal oxygen and carbon-dioxide curve method was made in a somewhat isolated "boat basin." Efficiency of production in this stationary, plankton containing water of Silver Springs origin was about 1%. Further evidence was obtained of nitrate increase in water flowing from anaerobic springs over blue-green algae. The area based chlorophyll of the benthic Silver Springs community was similar to that in forests and lakes of Europe. (63 pages)
    Keywords: Ecology ; Limnology ; diatoms ; Silver Springs ; Florida ; productivity
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  • 11
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    Fine sediment erodibility in Lake Okeechobee, Florida (2021)
    University of Florida Coastal and Oceanographic Engineering Department | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/127 | 3 | 2020-08-24 02:53:49 | 127 | Oceanographic Engineering Program, Department of Civil and Coastal Engineering, University of Florida
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    Publication Date: 2021-06-26
    Description: The critical need to predict the turbidity in water due to fine-grained sediment suspensionunder wave action over mud deposits for sedimentation and erosion studies, as well assorbed contaminant transport, is well known. Since fall velocities of fine sediment particlesare very small, they can be easily transported by hydrodynamic flows such as waves andcurrents. The presence of these particles in the water column affects accoustic transmission,heat absorption and depth of the eutrophic zone (Luettich et al., 1989). Because these sedimentsalso have a strong affinity for sorbing nutrients and toxic chemicals, sediments whichhave been deposited on the bottom may function as a source of contaminants to the watercolumn if they are disturbed by eroding forces resulting, for instance, from wave action. Anoutstanding example of a water body for these problems is Lake Okeechobee, the largestshallow lake in Florida. This lake shows typical signs of artificial eutrophication mainly dueto increased phosphorus loading associated with the surrounding region. Resuspension of sediment at the bottom of Lake Okeechobee composed of fine-grainedmaterial has been examined. A sediment transport model was used to simulate likelytrends in the evolution of the vertical suspended sediment concentration profile resultingfrom wave action, and the corresponding eroded bed depth was calculated through massbalance. Requisite information on characteristic parameters and relationships related tofine sediment erodibility were derived from field sampling of bottom sediment in the lake,and through laboratory experiments using this sediment and lake water. (161pp.)
    Description: South Florida Water Management District
    Keywords: Engineering ; Limnology ; Environment ; Chemistry ; Erosion ; Fine sediment ; Lake mud ; Lake Okeechobee
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  • 12
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    Habitat Use by Migratroy Shorebirds at the Cabo Rojo Salt Flats, Puerto Rico (2021)
    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1077 | 3 | 2011-09-29 21:11:52 | 1077 | Florida Cooperative Fish and Wildlife Research Unit
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    Publication Date: 2021-07-05
    Description: The Cabo Rojo Salt Flats, at the southwestern tip ofPuerto Rico, provide important autumn stopover and winteringhabitat for migratory shorebirds. I studied the abundanceand distribution of shorebirds and their food resources atthis site during autumn of 1990 and 1991.Small calidrids (primarily Calidris pusilla and C.mauri) were the most abundant shorebirds at the salt flats.The maximum weekly counts of small calidrids in 1990 (2,690)and 1991 (3,532) occurred in mid October. Calidrids foragedprimarily in the Fraternidad lagoon system; roosting tookplace most often at the neighboring Candelaria Lagoon.The macroinvertebrate prey important to calidrids in theFraternidad system were Dasyhelea (Diptera), Trichocorixa(Hemiptera), and Artemia (Anostraca). Changes in invertebrateabundance coincided with fluctuations in salinity. (100 page document)
    Description: Research Work Order no. 78
    Keywords: Conservation ; Management ; Biology ; Limnology ; Shorebirds ; Cabo Rojo Salt Flats ; Puerto Rico ; migration ; Calidrids ; Candelaria Lagoon
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  • 13
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    Factors affecting breeding status of wading birds in the Everglades. (2021)
    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1079 | 3 | 2011-09-29 21:09:38 | 1079 | Florida Cooperative Fish and Wildlife Research Unit
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    Publication Date: 2021-07-05
    Description: This goals of this research and monitoring effort are to document nesting effortand roughly categorize success of nesting by wading birds in the central Everglades ofFlorida, and to investigate the causes of nonbreeding in a high proportion of the adultwading birds in the ecosystem The latter goal has focused on breeding of White Ibises(Eudocimus albus) and has been approached through 1) understanding the nutritional,behavioral, and hormonal aspects of normal breeding in a captive colony ofScarlet Ibises(considered conspecific to White Ibises) in central Florida, and 2) comparing breeding andnonbreeding wild White Ibises in the Everglades, in their physiology, nutritional state,breeding phenology, contaminant load, and hormonal status. This report covers work onthis project between January and November, 2000. (81 page docoument)
    Description: Research Work Order no. 191
    Description: 2000 draft Final Annual Report to The U. S. Army Corps of Engineers Jacksonville, Florida
    Keywords: Conservation ; Management ; Biology ; Limnology ; Wading birds ; nesting success ; Everglades ; Water Conservation Area 1 ; Water Conservation Area 2 ; Water Conservation Area 3 ; Florida ; water levels ; Loxahatchee National Wildlife Refuge ; Northeast Shark Slough (NESS) ; White Ibis ; Eudocimus albus
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  • 14
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    Monitoring and Research on Wading Birds in the Water Conservation Areas ofthe Everglades: The 1996 Nesting season (2021)
    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1075 | 3 | 2011-09-29 21:11:45 | 1075 | Florida Cooperative Fish and Wildlife Research Unit
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    Publication Date: 2021-07-05
    Description: This project was initiated to continue monitoring reproductive responses of wadingbirds in the central Everglades, and to investigate two areas of research considered key tounderstanding and managing wading birds: nestling energetics, and factors affecting foodavailability. This report summarizes the first of two years of work. (101 page document)
    Description: Final Report to The U. S. Army Corps of Engineers Jacksonville, Florida
    Keywords: Conservation ; Management ; Biology ; Limnology ; Wading birds ; nesting success ; Everglades ; Water Conservation Area 1 ; Water Conservation Area 2 ; Water Conservation Area 3 ; Florida ; water levels ; Loxahatchee National Wildlife Refuge ; Northeast Shark Slough (NESS)
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  • 15
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    Wading Bird Nesting Success in the Water Conservation Areas of the Everglades, 1993 (2021)
    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1073 | 3 | 2011-09-29 21:11:39 | 1073 | Florida Cooperative Fish and Wildlife Research Unit
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    Publication Date: 2021-07-05
    Description: This report documents breeding numbers, reproductive success, and foragingdispersion of long-legged wading birds in the Water Conservation Areas (WCAs) of theEverglades during the first six months of 1993. Briefly, the 1993 spring had abnormallyhigh water and windy conditions throughout the season, and produced poor nesting effort,low to moderate nesting success, and low production of young. Some species, like WoodStorks and White Ibises, did not nest at all in the WCAs. Others, like Great Egrets andTricolored Herons, showed considerably tenacity under the extremely poor nestingconditions. The 1993 season provided a rare chance to record the reproductive responses ofwading birds during sustained high water conditions. (108 page document)
    Description: Research Work Order no. 110
    Description: Final Report to The U. S. Army Corps of Engineers Jacksonville, Florida
    Keywords: Conservation ; Management ; Biology ; Limnology ; Wading birds ; nesting success ; Everglades ; Water Conservation Area 1 ; Water Conservation Area 2 ; Water Conservation Area 3 ; Florida ; water levels ; Loxahatchee National Wildlife Refuge ; Northeast Shark Slough (NESS)
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  • 16
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    Fish community structure in some naturally acid Florida lakes (2021)
    University of Florida, Department of Fisheries | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1084 | 3 | 2011-09-29 21:12:43 | 1084 | Florida Cooperative Fish and Wildlife Research Unit
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    Publication Date: 2021-07-05
    Description: This study investigated the status of fish communitiesin 12 naturally acid Florida lakes. The small, shallowlakes were located in the Ocala National Forest, the TrailRidge, and panhandle Florida; regions where lakes have lowacid neutralizing capacities and are considered sensitive tofurther acidification from anthropogenic sources.Fifteen species from seven families were capturedduring mark-recapture sampling. Warmouth (Lepomis gulosus)was the only cosmopolitan species in the study. Bluegill(Lepomis macrochirus) and largemouth bass (Micropterussalmoides), collected from 11 and 10 lakes, respectively,were also widely distributed species. Total fish abundanceand biomass were not related to lake pH or total alkalinity.(Document has 202 pages)
    Description: Research Work Order no. 73
    Description: PhD
    Description: This document was Cecil Jenning's Ph.D. dissertation submitted to the Department of Fisheries and Aquaculture, University of Florida.
    Keywords: Biology ; Limnology ; Chemistry ; lakes ; Florida ; fishes ; community ; water chemistry
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  • 17
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    Factors affecting breeding status of wading birds in the Everglades. (2021)
    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1078 | 3 | 2011-09-29 21:11:55 | 1078 | Florida Cooperative Fish and Wildlife Research Unit
    Details
    Publication Date: 2021-07-05
    Description: This report summarizes work done during the 1998 field season on ResearchWork Order 188, for the U.S. Army Corps ofEngineers through the U.S. GeologicalService's Biological Resource Division's Florida Cooperative Research Unit.The goals ofthis work were to continue the monitoring of nesting by waterbirdsin the central and northern Everglades, and to initiate research aimed at understandingwhy a very large proportion ofthe adult wading birds in the Everglades do not initiatenesting in most years.Between January and July of 1998, we performed systematic aerial surveys ofWCAs 1, 2, and 3 ofthe central and northern Everglades in order to locate and documentbreeding colonies ofwading birds. In addition, we performed systematic ground surveysto serve as checks on the aerial work, and to document solitary nesting species, and darkcolored species not easily counted from the air. (88 page document)
    Description: Research Work Order no. 188
    Description: Final Report to The U. S. Army Corps of Engineers Jacksonville, Florida
    Keywords: Conservation ; Management ; Biology ; Limnology ; Wading birds ; nesting success ; Everglades ; Water Conservation Area 1 ; Water Conservation Area 2 ; Water Conservation Area 3 ; Florida ; water levels ; Loxahatchee National Wildlife Refuge ; Northeast Shark Slough (NESS)
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    Factors affecting breeding status of wading birds in the Everglades. (2021)
    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1080 | 3 | 2011-09-29 21:09:44 | 1080 | Florida Cooperative Fish and Wildlife Research Unit
    Details
    Publication Date: 2021-07-05
    Description: This comprehensive final report summarizes the results of a four-year researchand monitoring effort (1998 - 2001) designed to document nesting effort and success bywading birds, and to investigate the reproductive physiology and ecology of White Ibises(Eudocimus albus) in the Everglades ecosystem. The monitoring of nesting has beenaccomplished bystandardized systematic aerial and ground surveys and study of nestingsuccess of nesting colonies in Water Conservation Areas (WCAs) 2 and 3 ofthe centralEverglades. The White Ibis work was accomplished through 1) investigation of thenutritional, behavioral, and hormonal aspects of "normal" breeding in a captive colony ofScarlet Ibises (Eudocimus ruber, considered by many to be the same species as the WhiteIbis), and 2) documenting the physiology, nutritional state, breeding phenology,contaminant load, and hormonal status of free- living adult White Ibises in the centralEverglades. (364 page document)
    Description: Research Work Order no. 191
    Description: 2001 final comprehensive report to The U. S. Army Corps of Engineers Jacksonville, Florida
    Keywords: Conservation ; Management ; Biology ; Limnology ; Wading birds ; nesting success ; Everglades ; Water Conservation Area 1 ; Water Conservation Area 2 ; Water Conservation Area 3 ; Florida ; water levels ; Loxahatchee National Wildlife Refuge ; Northeast Shark Slough (NESS) ; White Ibis ; Eudocimus albus
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    Chemical characteristics of Santa Fe River in relation to local geology (2021)
    Florida Cooperative Fish and Wildlife Research Unit, University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1110 | 3 | 2011-09-29 21:07:12 | 1110 | Florida Cooperative Fish and Wildlife Research Unit
    Details
    Publication Date: 2021-07-05
    Description: 79 page document.
    Description: Supported by: U.S. Department of the Interior Fish and Wildlife Service Contract No. 14-16-0009-80-038
    Keywords: Limnology ; Earth Sciences ; Santa Fe River ; Florida ; geology
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    Methodology to assess the value of Florida wetlands to fish and wildlife: an annotated bibliography (2021)
    Florida Cooperative Fish and Wildlife Research Unit, University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1109 | 3 | 2011-09-29 21:08:03 | 1109 | Florida Cooperative Fish and Wildlife Research Unit
    Details
    Publication Date: 2021-07-05
    Description: The following bibliography was compiled for use by the CooperativeFish and Wildlife Unit and their cooperators as an aid in determiningresearch priorities in Florida wetlands. Emphasis was placed on studiesdone on the economic value of wetlands, values to fish and wildlife, methodsof sampling in a wetland area, and restoration practices. Material wasgenerally gathered from studies done in the southeast, however, somerelevant national papers were also included. (35 page document)
    Description: Supported by: U.S. Department of the Interior Fish and Wildlife Service Contract No. 14-16-0009-80-038 November
    Keywords: Limnology ; Policies ; wetlands ; Florida ; values
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    The effects of the Suwannee River Sill on the hydrology and vegetation of Okefenokee Swamp (2021)
    Florida Cooperative FIsh and Wildlife Research Unit, University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1111 | 3 | 2011-09-29 21:07:25 | 1111 | Florida Cooperative Fish and Wildlife Research Unit
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    Publication Date: 2021-07-05
    Description: The Suwannee River sill was constructed following extensive wildfires during1954-1955, with the intent of protecting the swamp and surrounding uplands from effectsof wildfires. During subsequent years, concern was raised that the dam might beadversely affecting the swamp ecology by extending periods of inundation, increasingwater depths, and subsequently affecting swamp vegetation. Delineating the effects ofthe Suwannee River sill on the swamp hydrologic environment and vegetationdistributions, in the process of exploring relationships among driving functions andlandscape responses, was a purpose of this research.(834 page document)
    Description: Supported by: U.S. Department of the Interior Fish and Wildlife Service Contract No. 14-16-0009-80-038 November
    Keywords: Limnology ; Policies ; Suwannee River sill ; Okefenokee Swamp ; wildfires ; Florida ; wetlands ; Georgia
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    Beach face dynamics as affected by ground water table elevations (2021)
    University of Florida. Department of Coastal and Oceanographic Engineering | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/496 | 3 | 2020-08-24 03:02:24 | 496 | Oceanographic Engineering Program, Department of Civil and Coastal Engineering, University of Florida
    Details
    Publication Date: 2021-06-30
    Description: This report presents the results of laboratory studies which were carried out in the Coastaland Oceanographical Engineering Laboratory to investigate the effects of ground water tableelevations on the beach profile changes over the swash zone. The experiment was conducted atthree different water table levels while the other experimental conditions were fixed to constantvalues with regular waves. The water table levels included (1) normal water table level whichis the same as mean sea level, (2) a higher level and (3) a lower level than the mean sealevel. Special attention was given to the higher water level to investigate whether this levelenhances erosion of the beach face and also to methods of interpreting the experimental data.The experiment described herein was carried out with a fairly fine sand and has demonstratedthe significance of beach water table on profile dynamics. The increased water table levelcaused distinct effects in three definite zones. First, erosion occurred at the base of the beachface and the sand eroded was carried up and deposited on the upper portion of the beachface. Secondly, the bar trough deepened considerably and rapidly and the eroded sand wasdeposited immediately landward. This depositional area changed from mildly erosional tostrongly depositional. Third, the area seaward of the bar eroded with a substantial deepening.The lowered water table appeared to result in a much more stable beach and the resultingeffects were much less. The only noticeable trend was a limited deposition in the scour area atthe base of the beach face. (Document has 37 pages.)
    Keywords: Oceanography ; Limnology ; Engineering ; Earth Sciences ; Beach erosion ; ground water
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    Comparison of cattail (Typha sp.) occurrence on a photo-interpreted map versus a satellite data map (2021)
    Florida Cooperative FIsh and Wildlife Research Unit, University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1116 | 3 | 2011-09-29 21:06:16 | 1116 | Florida Cooperative Fish and Wildlife Research Unit
    Details
    Publication Date: 2021-07-05
    Description: A comparison between a 1985 photo-interpreted vegetation mapand a vegetation map made from classified 1987 satellite data ofthe Loxahatchee National Wildlife Refuge showed that 81% ofsamples taken in areas occupied by cattail (Typha sp.) on thephoto-interpreted map corresponded with cattail on the satellitedata map.(5 page document)
    Keywords: Biology ; Limnology ; Engineering ; Loxahatchee National Wildlife Refuge ; satellite imagery ; cattail ; Typha sp.
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    Two-dimensional finite-difference model for moving boundary hydrodynamic problems (2021)
    University of Florida, Department of Coastal and Oceanographic Engineering | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1069 | 3 | 2011-09-29 21:11:07 | 1069 | Oceanographic Engineering Program, Department of Civil and Coastal Engineering, University of Florida
    Details
    Publication Date: 2021-07-05
    Description: To predict the hydrodynamics of lakes, estuaries and shallow seas, a two 'dimensionalnumerical model is developed using the method of fractional steps. Thegoverning equations, i.e., the vertically integrated Navier-Stokes equations of fluidmotion, are solved through three steps: advection, diffusion and propagation. Thecharacteristics method is used to solve the advection, the alternating direction implicitmethod is applied to compute the diffusion, and the conjugate gradient iterativemethod is employed to calculate the propagation. Two ways to simulatethe moving boundary problem are studied. The first method is based on the weirformulation. The second method is based on the assumption that a thin water layerexists over the entire dry region at all times. A number of analytical solutions areused to validate the model. The model is also applied to simulate the wind drivencirculation in Lake Okeechobee, Florida.(135 page document)
    Keywords: Oceanography ; Limnology ; Engineering ; hydrodynamics ; simulations ; lakes ; estuaries ; Lake Okeechobee ; Florida ; thesis
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    Productivity of Florida Springs: Second annual report to Biology Branch, Office of Naval Research progress from January 1 to December 31, 1954 (2021)
    University of Florida, Gainesville, Department of Biology | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/373 | 3 | 2011-09-29 22:09:11 | 373
    Details
    Publication Date: 2021-06-29
    Description: Production measurements at different times of the year indicate a linear relationship of light intensity and overall production at about 8% of the visible light energy reaching plant level. Measurements of a coral reef at Eniwetok indicate 6%. Further evidence of breeding at all seasons but with a quantitative pulse in the seasons of maximum light indicates that the seasonal fluctuation in primary production is routed through reproduction rather than through major changes in populations. The succession of plants and anmals of the aufwuchs has been shown with glass slides and counts from Sagittaria blades. Losss of oxygen bubbles during the day and emergence of aquatic insects at night have been measured with funnels. Bell jar measurements are reported for bacterial metabolism on mud surfaces. pH determined CO2 uptake agrees with titration determinations. A few rough estimates of herbivore production have been made from caged snails, aufwuchs succession, and fish tagging. Nitrate uptake a night by aufwuchs communities has been confirmed in a circulating microcosm experiment as well as in bell jars in the springs. Distributions of oxygen and organisms have been used to criticize the saprobe stream classification system. Theoretical consideration of maximum photosynthetic rates in teh literature data indicates logarithmic rate variation inversely with organismal size just as for respiratory metabolism. Extreme pyramid shapes are thus shown for communities in which organismal size decreases up the food chain and for other communities with the same energy influx but with organismal size increasing up the food chain. Literature data is used to further demonstrate the validity of the optimum efficiency-maximum power principle for photosynthesis. Work on plants by Dr. Delle Natelson indicates essential stability of aquatic plant communities after 3 years and about 10-20% reproducibility in previous biomass estimates by Davis. Work on an animal picture of the fishery characteristics by Caldwell, Barry, and Odum is half completed. The study of aquatic insects in relationship to spring gradients by W.C. Sloan has been completed an an M.S. thesis. J. Yount has begun a study of affect of total productivity on community composition using aufwuchs organisms on glass slides placed in different current and light conditions in Silver Springs. (49pp.)
    Keywords: Ecology ; Limnology ; Silver springs ; springs ; insects ; algae ; aufwuchs ; diatoms ; productivity ; Florida ; fishes
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    Relations of environmental contaminants, algal toxins, and diet with the reproductive success of American alligators on Florida Lakes (2021)
    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1076 | 3 | 2011-09-29 21:11:49 | 1076 | Florida Cooperative Fish and Wildlife Research Unit
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    Publication Date: 2021-07-05
    Description: (113 page document)
    Description: Research Work Order no. 193
    Keywords: Management ; Conservation ; Pollution ; Biology ; Limnology ; endocrine disruption ; American alligator ; Florida ; reproduction
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    Dry Down Tolerance of the Florida Apple Snail (Pomacea paludosa, Say): Effects of Age and Season (2021)
    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1065 | 3 | 2011-09-29 21:10:33 | 1065 | Florida Cooperative Fish and Wildlife Research Unit
    Details
    Publication Date: 2021-07-05
    Description: This Research Work Order includes three experiments to look at apple snail dry downsurvival as a function of age and season. Two of those experiments have been completedand the third one will likely run through February (depending on snail survival). The thirdexperiment began on September 2 1, 1998. The detailed results of Experiment # 1 and #2were reported in the update report of 10/15/98. The overall survival for Experiments #I and#2 are included herein for comparison with Experiment #3. (7 page document)
    Description: Research Work Order no. 182
    Keywords: Biology ; Limnology ; Florida Apple Snail ; Pomacea paludosa ; Say ; Florida ; dry down ; water levels
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    Winter Movements and Use of Warm-water Refugia by Radio-tagged West Indian Manatees Along the Atlantic Coast of the United States (2021)
    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1068 | 3 | 2011-09-29 21:11:03 | 1068 | Florida Cooperative Fish and Wildlife Research Unit
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    Publication Date: 2021-07-05
    Description: The West Indian manatee's metabolic physiology constrains it to subtropical and tropicalregions. In waters of the United States, a manatee's ability to find reliable warm-water refugiaduring winter cold periods is critical to its survival. This report documents how radio-taggedmanatees used a network of 14 industrial and 3 "natural" warm-water sites along the east coastof Florida and Georgia duringwinter. Most industrial sites were powerplant discharges but alsoincluded pulp mill effluents. TheU. S. Geological Survey's SireniaProject tracked 71 manateesover 12 winter seasons (1986-1998) using field-based VHF radio-telemetry and Argos satellite based telemetry.Thirty-seven individuals weretracked over periodsofat least 100daysbetween November and March of a given winter, manyfor multiple years. Presence at a warmwaterrefugewasdefinedas a location occurring within 200m (for a VHF field observation) orwithin 1 km (for a satellite-determined location) ofthe site. (133 page document)
    Description: Sirenia Project, Florida Caribbean Science Center, U.S. Geological Survey
    Description: Final Report Prepared for: Florida Power and Light Company Environmental Services Dept. 700 Universe Blvd. Juno Beach, FL 33408 and U.S. Geological Survey, Florida Caribbean Science Center, Sirenia Project 412 NE 16th Ave., Rm. 250 Gainesville, FL 32601
    Keywords: Biology ; Limnology ; Information Management ; West Indian Manatee ; Trichechus manatus ; Florida ; tracking ; water temperature ; movements
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    Research objectives to support the South Florida Ecosystem Restoration initiative-Water Conservation Areas, Lake Okeechobee, and the East/West waterways (2021)
    Florida Cooperative Fish and Wildlife Research Unit , University of Florida | Gainesville, FL
    In:  http://aquaticcommons.org/id/eprint/1087 | 3 | 2011-09-29 21:10:01 | 1087 | Florida Cooperative Fish and Wildlife Research Unit
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    Publication Date: 2021-07-05
    Description: The South Florida Ecosystem encompasses an area of approximately 28,000 km2 comprising at least 11major physiographic provinces, including the Kissimmee River Valley, Lake Okeechobee, the Immokalee Rise, theBig Cypress, the Everglades, Florida Bay, the Atlantic Coastal Ridge, Biscayne Bay, the Florida Keys, the FloridaReef Tract, and nearshore coastal waters. South Florida is a heterogeneous system of wetlands, uplands, coastalareas, and marine areas, dominated by the watersheds of the Kissimmee River, Lake Okeechobee, and theEverglades.Prior to drainage, wetlands dominated the ecosystem, covering most of central and southern Florida. Thelandscapes included swamp forests; sawgrass plains; mosaics of sawgrass, tree islands, and ponds; marl-formingprairies dominated by periphyton; wet prairies dominated by Eleocharis and Nymphaea; freshwater marshes;saltwater marshes; cypress strands; and a vast lake-river system draining into Lake Okeechobee. Elevated areasthat did not flood supported pine flatwoods, pine rocklands, scrub, tropical hardwood hammocks, and xerichammocks dominated by oaks. The natural seascapes of South Florida consisted of riverine and fringe mangroveforests; beaches and dunes; seagrass beds; intertidal flats; mud banks; hardbottom communities; coral reefs; andopen, inshore shallows. All these habitats were interconnected on an extremely low topographic gradient (2.8cm/km) with elevations ranging from about 6 m at Lake Okeechobee to below sea level at Florida Bay.The Science SUb-Group (1993) described the defining characteristics of the South Florida Ecosystem and the problems that resulted from hydrologic alterations and other anthropogenic changes.Restoration objectives were proposed for each sub-regionand the region as a whole.The overall goal of the restoration effort is to restore a sustainable South Florida Ecosystem that preservesthe valued properties of South Florida's natural systems and supports productive agriculture-, fishery-, and tourist.based economies and a high quality of urban life. Sustainability means high natural productivity, human andecosystem health, and resiliency to climatic extremes and catastrophic events. It also means accommodation ofneeds of human systems-flood control, irrigation, and drinking water supply.SCOPEThis section addresses the entire ecosystem, cutting across the artificial boundaries of designatedsubregions, as well as geopolitical and geomorphological boundaries, to present the broader issues of deVelopingan interagency and interdisciplinary ecosystem-based science program to support South Florida restoration. Herewe discuss the general premise and the general approach, with brief discussions on monitoring, modeling, andspecial studies. The latter two topics are covered in greater detail in other sections. (PDF contains 119 pages)
    Description: Research Work Order no. 139
    Description: Science sub-meeting, September 27, 1994
    Keywords: Management ; Limnology ; Planning ; South Florida Ecosystem Restoration Initiative ; objectives
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    Field validation of the 'Logie' fish counter at Forge weir on the River Lune, 1992 (2021)
    National Rivers Authority North West | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8532 | 1256 | 2012-12-21 15:13:52 | 8532 | Environment Agency, UK (Freshwater Biological Association)
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    Publication Date: 2021-07-03
    Description: The stock assessment task group report (1991) mentions that fish counters could play a key role in providing data on the size of the adult stock, and in particular the migratory salmonid stock. This report assesses the performance of the 'logie' fish counter at Forge Weir on the River Lune. Using video surveillance, a total of 1137 hours time lapse and 15 hours real time were used for validation purposes. This report looks at materials and methods, counting accuracy, sizing ability and environmental conditions, performance across the electrode array and salmonid swimming speed.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Lune Catchment ; River Fisheries ; Fish counters ; Migratory species ; Salmon fisheries ; Environmental condtions
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    The calibration of a semi-quantitative approach to fish stock assessment in the North West Region of the NRA (2021)
    National Rivers Authority North West | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8531 | 1256 | 2012-12-21 15:14:38 | 8531
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    Publication Date: 2021-07-03
    Description: (1) A total of 45 sites was sampled, each being fished usingthe semi-quantitative and quantitative techniques.(2) A significant relationship existed between thesemi-quantitative and Quantitative results for all agegroups of salmonids (R2 83.4% to 96.1%, p 〈 0.0001).(3) The results from each site were categorised according toan existing classification system for quantitative andsemi-quantitative data. The semi-quantitative component ofthis system was modified using the results of thisinvestigation. The degree of error associated with sitesclassified semi-quantitatively was found to be slightlyless when using the modified system for 0+ salmon, 〉 0+salmon and 0+ trout, ranging from 10.5% to 30%.(4) Insufficient data points were available for the analysisof coarse fish data.
    Description: Environment Agency Archives North West
    Description: + Appendices
    Keywords: Fisheries ; Limnology ; England ; Cumbria ; Inland waters ; Freshwater fish ; Stock assessment ; Fish populations ; Environmental assessment ; Electric fishing
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    Summary of fishery statistics 1991 (2021)
    National Rivers Authority North West
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8365 | 1256 | 2012-03-04 21:55:18 | 8365 | Environment Agency, UK (Freshwater Biological Association)
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    Publication Date: 2021-07-02
    Description: This fisheries report summarises developments of the year 1991 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions. Among the streams that are covered in the report are the River Lune, River Kent, River Leven, River Duddon, River Ribble, River Wyre, River Derwent and River Esk.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; England ; Cumbria ; Lancashire ; Inland fisheries ; Fish catch statistics ; Angling ; Stock assessment ; Licensing ; Fishing mortality ; Redds ; Salmonid fisheries ; Migratory species ; Hatcheries ; Stocking (organisms)
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    River Wyre - a migratory salmonid river (2021)
    National Rivers Authority North West
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8500 | 1256 | 2012-12-22 13:39:02 | 8500 | Environment Agency, UK (Freshwater Biological Association)
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    Publication Date: 2021-07-03
    Description: This report has been prepared in response to a request from the National Rivers Authority. It produces a broad assessment of the River Wyre as a migratory salmonid river based on a site visit and the documentation provided, and looks at objectives of the Wyre salmon and sea trout restoration group. It also looks at ways for habitat improvement and recommends other possible means of fisheries management development for the River Wyre.
    Description: Environment Agency Archives North West
    Description: + 15 plates
    Keywords: Ecology ; Environment ; Limnology ; England ; Wyre Catchment ; River fisheries ; Habitat improvement ; Migratory species ; spawning ; Salmo salar ; Salmo trutta ; Water quality
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    The River Lune fact file (2021)
    National Rivers Authority North West | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/7989 | 1256 | 2012-03-06 12:56:55 | 7989 | Environment Agency, UK (Freshwater Biological Association)
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    Publication Date: 2021-06-27
    Description: This document provides a brief introduction to the River Lune catchment and the role that the National Rivers Authority plays in catchment management.Included are a map of the catchment and short introductions to fisheries and characteristics of the catchment.
    Description: Environment Agency Archives North West
    Description: No date on publication, date given is estimated guess.
    Keywords: Conservation ; Environment ; Limnology ; England ; Lune Catchment ; Inland fisheries ; Catchment area ; Fishery management ; Nature conservation
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    Report on the 1992 stock assessment of the Wyre catchment (2021)
    National Rivers Authority North West | Preston, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8042 | 1256 | 2012-02-22 15:08:12 | 8042 | Environment Agency, UK (Freshwater Biological Association)
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    Publication Date: 2021-06-28
    Description: The aim of this study was to assess the status of the juvenile salmonid and coarse fish populations of the Wyre catchment. Emphasis was placed on an examination of the distribution of spawning and nursery areas for salmonids within the study area and an assessment of the status of juvenile salmonid stocks. The species distribution and spawning areas for other fish species were also identified where possible and the status of the Wyre coarse fishery, downstream of Churchtown Weir, assessed. This report examines the results of stock assessment surveys carried out in the Wyre catchment between 2/06/92 and 11/08/92. Forty-six sites were surveyed from Tarnbrook Wyre (SD. 598577) and Marshaw Wyre (SD. 614541) downstream to St Michaels (SD. 465411). Flow, habitat and in-river obstructions have been shown to affect juvenile salmonid densities. A habitat description is provided for each site studied during the course of this study.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Wyre Catchment ; Salmo salar ; Salmo trutta ; Rivers ; River fisheries ; Salmon fisheries ; Fishery surveys ; Stock assessment ; Distribution ; Population number ; Length frequency
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    Report on the 1994 juvenile salmon stocking study of Foxhouses and Grizedale Becks, River Wyre (2021)
    National Rivers Authority North West | Preston, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8044 | 1256 | 2012-02-22 15:07:40 | 8044 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: The aim of this study was to assess the suitability of Foxhouses and Grizedale Becks as nursery habitat for juvenile salmon. A comprehensive fish stock assessment survey of the Wyre catchment was carried out by the NRA in 1992. This survey found that juvenile salmon were absent from two sites studied in Foxhouses Beck. In one site in Grizedale Beck, 0+ salmon were found at very low densities. Juvenile trout were found in all three sites studied in 1992. On the basis of the results of the 1992 survey, these two becks were stocked in 1994 with 0+ salmon reared from Lune broodstock at the NRA's Witcherwell Hatchery. These salmon were stocked at a known density, following a pre-stocking survey. This report examines and compares the results of the pre-stocking survey consisting of fourteen sites in the two becks, carried out between 12/04/94 and 27/04/94 and a post-stocking survey of six sites, carried out between 12/10/94 and 19/10/94. Flow, habitat and in-river obstructions have been shown to affect juvenile salmonid densities. A habitat description is provided for each site surveyed during the course of this study.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Wyre Catchment ; Salmo salar ; Salmo trutta ; Rivers ; River fisheries ; Salmon fisheries ; Fishery surveys ; Stocking density ; Distribution ; Population number ; Length frequency
    Repository Name: AquaDocs
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    An analysis of salmon rod catch data from castle fisheries, River Derwent, 1923-1989. (2021)
    National Rivers Authority North West | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8057 | 1256 | 2012-02-24 12:39:06 | 8057 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: The aim of this study was to investigate the historical catch record from the Castle Fishery on the River Derwent over the period 1923 - 1989, to determine if changes had taken place in the composition of the catch and to examine the influence of flow on the performance of the fishery. The River Derwent is situated in West Cumbria, North West England. It flows from its source on Scafell Pike (NGR NY 229 089) westwards discharging into the Irish sea at Workington, a distance of 52 km. Over its length it receives water from an additional 214 km of stream, 5 large lakes and approximately 30 small tarns. The catchment drains a total area of 663 km2.The study concludes that through the time period there was considerable variation in catch between years. The trend was for the catch to increase steadily over the period 1923 - 1958, declining rapidly in 1959, after which catches increased steadily reaching a peak in the mid-sixties, before declining towards the end of the decade. During the seventies and eighties catches remained relatively stable at between 300 - 600 salmon per year until 1988 when over 2000 salmon were reported caught, the greatest number in any year over the study period.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Derwent Catchment ; Rivers ; Fishery surveys ; Catch statistics ; Long-term records ; Flow measurement
    Repository Name: AquaDocs
    Type: monograph
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  • 38
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    An analysis of migratory salmonid catch effort data, derived from anglers' log books, 1991 (2021)
    National Rivers Authority North West | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8082 | 1256 | 2012-03-01 17:34:44 | 8082 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: 1000 log books were issued to anglers of which 236 were returned, those from the rivers Derwent, Kent, Lune and Ribble accounted for the vast majority. The Derwent had the highest catch rate of these rivers: one salmon every 13.89 hours followed by the Lune, Kent and Ribble at 16.39, 18.87 and 35.71 hours, respectively. For sea trout the Lune, Derwent and Ribble had a catch rate of approximately one fish every 10.0 hours (9.8, 10.0 and 10.64 hours),and for the Kent one fish per 16.1 hours fished. Salmon angling visits were, in general,longer than those for sea trout being between 2 and 6 hours as opposed to 2 to 4 hours. On the majority of visits (〉80%) no fish were caught and was the same for salmon and sea trout. For salmon the majority of fish were caught on fly, spinner or worm, and the least on prawn. For sea trout fly predominated. The majority of salmon caught were less than 91b in weight and were presumed to be grilse (1 sea winter). The majority of the sea trout caught weighed between 1 and 31b. The pattern of catch, effort, CPUE, abundance and catchability for salmon and sea trout were modelled using the data from the rivers Derwent, Kent and Lune. Flow significantly influenced catch, effort and catchability of salmon which had entered in a particular month. For sea trout flow was not significantly correlated with any of the dependent variables. The catchability coefficient for salmon, determined from the total number of fish, remained relatively constant over the period June to October indicating that CPUE was a reasonable measure of within season abundance. This was not found to be the case for sea trout.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; England ; Rivers ; Logbooks ; Salmo salar ; Salmo trutta ; Salmon fisheries ; Catch statistics ; Catch/effort ; Weight ; River fisheries
    Repository Name: AquaDocs
    Type: monograph
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  • 39
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    Report on an egg bioassay experiment (2021)
    National Rivers Authority North West | Preston, UK
    In:  http://aquaticcommons.org/id/eprint/8079 | 1256 | 2012-02-17 13:42:01 | 8079 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: In October 1992, a fish population survey of the Swanside Beck system revealed that the densities of juvenile salmon present in the beck were generally poor. The survey highlighted that a potential reason for this may be due to a lack of spawning substrate resulting from siltation. Numerous workers have found that increased levels of A salmonid egg box experiment of Swanside Beck carried out in the spring of 1994, revealed that the survival rates in the majority of sites were good. While the in-site variability was relatively high, mean survival rates remained in excess of 70%. As a result egg survival rates were eliminated as the reason for low juvenile salmonid production. The only site with a relatively low survival rate was Swanside Beck downstream of Cowgill Beck. However, even at this site siltation was eliminated as the cause of the increased mortality rate. It is recommended that a salmonid stocking of Swanside Beck should be carried out this year. This should be followed by an electric fishing survey to evaluate juvenile salmonid survival rates.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Ribble Catchment ; Salmon fisheries ; Fry ; Survival ; Stocking (organisms) ; Silting
    Repository Name: AquaDocs
    Type: monograph
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  • 40
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    An evaluation of the survival of Atlantic salmon (Salmo salar L.)fry stocked in eight streams in the North West of England. (2021)
    National Rivers Authority North West | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8083 | 1256 | 2012-03-01 17:34:08 | 8083 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-29
    Description: Eight streams from the North West of England were stocked with Atlantic salmon (Salmo salar L.) fed fry at densities ranging from 1 to 4/m2 over a period of up to three years to evaluate survival to the end of the first an d second growing periods and hence assess the value of stocking as a management practice. Survival to the end of the first growin g period (mean duration of 108 days) was found to vary between 7.8 and 41.3% with a mean of 22% and CV of 0.44. Survival from the end of the first growing period to the end of the second growing period (mean duration of 384 days) ranged from 19.9 to 34.1% with a mean of 26.3% and CV of 0.21. Survival was found to be positively related to 0+ trout density (P 〈 0.05) and negatively related to altitude (P 〈 0.05). A comparison of the raw survival data (non standardised with respect to duration of experiments) with that from other studies in relation to stocking densities revealed a negative relationship between fry survival and stocking density (P 〈 0.05). Densities in excess of 5/m2 tended to result in lower levels of survival. Post stocking fry dispersal patterns were examined for the 1991 data. On average 86.7% of the number of fry surviving remained within the stocked zone by the end of the first growing period. With the exception of one stream there was little in the way of dispersal beyond the stocked zone. The dispersal pattern approximated to the normal distribution (P 〈 0.05). It was estimated that stocking can result in a net gain of fish to a river system compared with natural productivity, however the numerical significance of this gain and its cost effectiveness need to be determined on a river specific basis.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Rivers ; River fisheries ; Fry ; Stocking (organisms) ; Redds ; Marking ; Stocking density ; Spawning populations ; Fish eggs ; Distribution ; Survival
    Repository Name: AquaDocs
    Type: monograph
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  • 41
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    Central area fisheries annual report 1995 (2021)
    National Rivers Authority North West | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8510 | 1256 | 2012-12-21 15:35:55 | 8510 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-07-03
    Description: The purpose of this report is to record key events and achievements of the NRA Central Area Fisheries Function in 1995. Rivers include the Ribble, Hodder and Lune. The report looks at Hydrological and meteorological data, site visits made during the year, communications and reports, Capital works and purchases, Stock assessment, monitoring and specific investigations, Fisheries Management advice, Fish kills and rescues, Fish rearing and stocking. It also looks at rod and net catches for salmon and sea trout, micro-tag returns, the drought, the results of the 1995 objectives set the year before and the key objectives for 1996.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Rivers ; River fisheries ; Coarse fish ; Salmo salar ; Salmo trutta ; Stream flow ; Catch statistics ; Stock assessment ; Fish counters ; licensing ; Fisheries management
    Repository Name: AquaDocs
    Type: monograph
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  • 42
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    Summary of fishery statistics 1990 (2021)
    National Rivers Authority North West
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8363 | 1256 | 2012-03-04 21:55:34 | 8363 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-07-02
    Description: This fisheries report summarises developments of the year 1990 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions. Among the streams that are covered in the report are the River Lune, River Kent, River Leven, River Duddon, River Ribble, River Wyre, River Derwent and River Esk.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; England ; Cumbria ; Lancashire ; Inland fisheries ; Fish catch statistics ; Angling ; Stock assessment ; Licensing ; Fishing mortality ; Redds ; Salmonid fisheries ; Migratory species ; Hatcheries ; Stocking (organisms)
    Repository Name: AquaDocs
    Type: monograph
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  • 43
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    Summary of fishery statistics 1989 (2021)
    National Rivers Authority North West
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8344 | 1256 | 2012-03-04 21:55:45 | 8344 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-07-02
    Description: This fisheries report summarises developments of the year 1989 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions. Among the streams that are covered in the report are the River Lune, River Kent, River Leven, River Duddon, River Ribble, River Wyre, River Derwent and River Esk.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; Fisheries statistics
    Repository Name: AquaDocs
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  • 44
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    Summary of fishery statistics 1993 (2021)
    National Rivers Authority North West
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8371 | 1256 | 2012-03-04 21:54:53 | 8371 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-07-02
    Description: This fisheries report summarises developments of the year 1993 in the North West region of the National Rivers Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions. Among the streams that are covered in the report are the River Lune, River Kent, River Leven, River Ribble and River Derwent.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; England ; Cumbria ; Lancashire ; Inland fisheries ; Fish catch statistics ; Angling ; Stock assessment ; Licensing ; Fishing mortality ; Redds ; Salmonid fisheries ; Migratory species ; Hatcheries ; Stocking (organisms)
    Repository Name: AquaDocs
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  • 45
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    Summary of fishery statistics 1992 (2021)
    National Rivers Authority North West
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8370 | 1256 | 2012-03-04 21:55:10 | 8370 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-07-02
    Description: This fisheries report summarises developments of the year 1992 in the North West region of the National Rivers Authority. It provides catch statistics, rod and line and commercial catches for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions. Among the streams that are covered in the report are the River Lune, River Kent, River Leven, River Ribble and River Derwent.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; England ; Cumbria ; Lancashire ; Inland fisheries ; Fish catch statistics ; Angling ; Stock assessment ; Licensing ; Fishing mortality ; Redds ; Salmonid fisheries ; Migratory species ; Hatcheries ; Stocking (organisms)
    Repository Name: AquaDocs
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  • 46
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    Report on the 1995 stock assessment of the Douglas catchment (2021)
    National Rivers Authority North West | Preston, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/7997 | 1256 | 2012-02-17 22:04:57 | 7997 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: The River Douglas has a long industrial heritage beginning in the early 18th century with its use by boats carrying goods between Wigan and Tarleton. The River and its tributaries have also historically been, and to a certain extent are still, subject to polluting inputs from the urban, agricultural and industrialised areas located within its catchment. During the early stages in the production of the River Douglas Catchment Management Plan, it became apparent that very little data existed on the populations of coarse and salmonid fish species within the River Douglas system. The data that did exist was largely anecdotal, consisting of catch reports from anglers or water bailiffs, or of dead and distressed fish following pollution incidents. This study was initiated to assess the status of coarse and salmonid fish species within the River Douglas system and so address the lack of knowledge. Eighty two sites were surveyed by electric fishing, including 14 sites using an electric fishing punt and up to four anodes. The data was analysed according to a new National Fisheries Classification Scheme. This classified the sites by the fish stock s present and compared the results with a database containing information from sites around the country that have similar habitat types. A stocking experiment was also undertaken in the River Lostock using chub reared at the Leyland Hatchery. These were marked with an identifiable blue spot in the spring of 1995 and then released into three, previously surveyed, locations in the river. These sites were then resurveyed during the summer stock assessment. This report also Site Reports with details on monitored sites, habitat features and fishery classification.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Ribble Catchment ; Rivers ; Electric fishing ; Catchment area ; Stock assessment ; Salmo trutta ; Salmo salar ; Salmonid fisheries ; Biomass
    Repository Name: AquaDocs
    Type: monograph
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  • 47
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    An investigation of the recaptures rates for tagged brown trout stocked into the River Ribble (2021)
    National Rivers Authority North West | Preston, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/7999 | 1256 | 2012-02-17 22:01:15 | 7999 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: The angling season for non-migratory brown trout, in the Environment Agency (EA) North West Region, runs from March 15th to September 30th. Each year, large numbers of farm reared brown trout are stocked into the rivers of the North West Region's Central Area. In 1994, approximately 20,000 brown trout were introduced into the River systems of the Lune, Wyre and Ribble by local angling clubs and fishery owners. Most of these fish were stocked at a length greater than that defined by local byelaws as the takeable size (200mm). Introductions are made to supplement the existing wild brown trout populations within the river and increase the probability of an angler catching a fish. Stocking with fish of a sufficient length allows the successful angler to remove the catch for their own use. In this way, stretches of the rivers are effectively managed as "put and take" fisheries for brown trout. A number of brown trout fingerlings are also introduced each year by angling clubs and fishery owners. These are stocked with the expectation that the fish will survive in the river to grow, over-winter, and eventually attain a takable size with an increased degree of "wildness". The lower cost of fingerlings, as opposed to trout of a takable length, makes their introduction more attractive to angling clubs since a greater number can be stocked for a given cost. Although the practise of stocking brown trout has occurred for many years in the Central Area, there is little information of its success in terms of increasing anglers catches, or the survival offish introduced. This study was initiated to determine the recapture rates by angling of brown trout following their introduction into a river fishery. The information gained from this study can then be used to give guidance to angling clubs and fishery owners on the optimal strategies for stocking fish.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Ribble Catchment ; Salmo trutta ; Rivers ; River fisheries ; Salmon fisheries ; Fishery surveys ; Angling ; Stocks ; Stock assessment ; Stocking (organisms)
    Repository Name: AquaDocs
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  • 48
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    Report on the collection of salmon creel census data from Rivers Ribble and Hodder (2021)
    National Rivers Authority North West | Preston, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/7995 | 1256 | 2012-02-17 13:42:34 | 7995 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: The River Ribble bailiff team completed a total of 377 salmonid creel censuses by interviewing anglers fishing on the banks of the Rivers Ribble and Hodder during 1994. The study was undertaken for a number of reasons: (i) , To determine which areas of the river were fished by anglers. (ii) To ascertain which fishing methods were used in these areas. (iii) To identify the success of each fishing method within each area of the River Ribble system. In a limited 1993 sampling programme, 55 censuses were carried out. Results from these indicated that fishing with worm as bait was the most common method (39% of anglers interviewed) and also resulted in the greatest number of salmon being caught (61% of all salmon). The 1994 census data were collected from all areas of the Ribble system during the months of June to October. The data presented here are for anglers fishing for salmon only or for those fishing for salmon and sea trout at the same time. All of the fish caught were salmon.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; England ; Ribble Catchment ; Rivers ; Census ; Salmon fisheries ; Angling ; Catching methods ; Catch statistics
    Repository Name: AquaDocs
    Type: monograph
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  • 49
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    Summary of fishery statistics, 1988 (2021)
    National Rivers Authority North West
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8107 | 1256 | 2012-03-04 21:55:55 | 8107 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-29
    Description: This fisheries report summarises developments of the year 1988 in the region of the North West Water Authority. It provides catch statistics, rod and line and commercial for salmon and sea trout, fish culture and hatchery operations, restocking with trout and freshwater fish, upstream fish movement recorded at authority fish counters, counts of salmon and sea trout spawning redds, fish mortalities, licences issued, and prosecutions. Among the streams that are covered in the report are the River Lune, River Kent, River Leven, River Duddon, River Ribble, River Wyre, River Derwent and River Esk.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; Fisheries statistics
    Repository Name: AquaDocs
    Type: monograph
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  • 50
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    An analysis of the historical catch data from the migratory salmonid fisheries of the River Ribble (2021)
    National Rivers Authority North West | Preston, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/7996 | 1256 | 2012-02-17 22:03:52 | 7996 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: The Ribble catchment is the largest and most diverse river system within National Rivers Authority (NRA), North West's Central Area. The river is approximately 100km in length and rises in a limestone area west of the Pennines. This report examines changes in the size and composition of the salmon and sea trout catches from the Ribble migratory salmonid fisheries during the years 1937 to 1991. Comparisons are made between the rod and net fisheries for both salmon and sea trout of the Ribble and Hodder. Patterns of catches shown by the Ribble fisheries are compared with those of other individual rivers and with patterns for the North West Region as a whole. An attempt is made to identify if any relationship exists between catch and stock abundance. Catch patterns shown by the Ribble and Hodder salmon fisheries are compared with electronic resistivity counter data from the two rivers. Annual salmon catch patterns and redd count data are compared both locally and regionally. Recommendations for future studies are made in the light of the report's findings.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; England ; Ribble Catchment ; Stock assessment ; Abundance ; Salmo salar ; Salmo trutta ; Long-term changes ; Salmon fisheries
    Repository Name: AquaDocs
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    Report on the analysis of salmon scale samples returned by anglers on the Rivers Ribble and Hodder (2021)
    National Rivers Authority North West | Preston, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/7998 | 1256 | 2012-02-17 22:03:15 | 7998 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-27
    Description: Fisheries technical staff from the North West Central Area of the National Rivers Authority (NRA) currently provide a service for the ageing of salmon scales from fish caught by anglers on the Rivers Ribble and Hodder in order to gather information on the biological characteristics of the salmon population on the River Ribble system in terms of weight, freshwater age and sea age.At the beginning of each fishing season, scale envelopes are distributed by the NRA to angling clubs and some individual anglers. Scales taken from salmon caught on the rivers are returned to the NRA Central Area Office by the anglers, or more often, by NRA bailiffs. The age of each fish caught is then determined by the identification and counting of annuli for both the river and sea zones on the scale. Information is provided by the angler on the scale packet concerning the length and weight of the fish caught, and the date, location and method of capture. Both this information and the age of the fish is recorded on a database. These data can be used to investigate the distribution, and exploitation patterns of the different age classes of the salmon stock within the river system. This report is principally concerned with the scale samples received in 1994, although comparison is also made with samples from 1993 and 1992. References to data will all relate to that received in 1994 unless an alternate year is stated.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Ribble Catchment ; Salmo salar ; Salmo trutta ; Rivers ; River fisheries ; Salmon fisheries ; Fishery surveys ; Scales ; Scale reading ; Angling
    Repository Name: AquaDocs
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  • 52
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    Arctic charr from Ennerdale Water: a pilot study (2021)
    National Rivers Authority North West | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8056 | 1256 | 2012-02-24 12:39:38 | 8056 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: There are three fish species in the north west of England, Arctic charr (Salvelinus alpinus, L.), schelly (Coreqonus lavaretus. L.), and vendace (C. albula, L.), which have been reported as rare and vulnerable and have been identified as requiring the preparation and implementation of a conservation management plan.The presence of Arctic charr in Ennerdale Water has resulted in it being designated as a Site of Special Scientific Interest. These fish and one race of the species in Lake Windermere are the only English populations of charr known to spawn in running water. Associated with Ennerdale charr is the copepod parasite Salmincola edwardsii which has not been recorded from any other charr inhabited waters of the Lake District. However, it has been recorded on charr from four Scottish Lochs (Stack, Lee, Tay and Doon). The unique nature of Ennerdale is further highlighted by the presence of two crustaceans, Mysis relicta and Limnocalanus macrurus. The former has been recorded in Ireland while the latter is not known to exist anywhere else in the British Isles. The aim of this pilot study was to obtain baseline data on charr that spawn in Smithy Beck and the River Liza. This would indicate the current status of the population and help identify areas requiring further investigation. A total of 161 fish (95 males and 66 females) was caught and tagged over the 3 day period, 141 from Smithy Beck and 20 from the Liza. The raw data of the findings is presented in two appendices.
    Description: Environment Agency Archives North West
    Keywords: Ecology ; Fisheries ; Limnology ; England ; Ennerdale Water ; Fishery survey ; Sex ratio ; Spawning ; Rivers ; Lakes ; Length frequency
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 22
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    Arctic charr from Ennerdale water - relicts of the ice age (2021)
    National Rivers Authority North West | Warrington, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8058 | 1256 | 2012-02-24 12:34:15 | 8058 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: The work discussed in this report deals with aspects of theecology of Arctic charr (Salvelinus alpinus, L.). The main aims of the study were: (1) To assess the relative abundance of migrants entering the River Liza and Smithy Beck in the English Lake District). (2) To assess the degree of stream specificity. (3) To determine the period of residency in the streams. (4) To obtain a better understanding of migratory behaviour. (5) To determine the growth rate of mature fish. (6) To determine the morphometric and meristic attributes. In conjunction with this work a study was carried out to investigate the feasibility of using a video recording system to monitor the migration of charr in Smithy Beck.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; England ; Ennerdale Water ; Salvelinus alpinus ; Fishery survey ; Sex ratio ; Spawning ; Rivers ; Lakes ; Length frequency ; Videotape recordings ; Abundance ; Migrations
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 91
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    A working guide to the assessment, implementation and post project monitoring of fisheries habitat improvement schemes in South Cumbria (2021)
    National Rivers Authority North West | Carlisle, UK
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8063 | 1256 | 2012-02-24 12:35:43 | 8063 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: Due to changes in land use over the last century, the physical nature of many streams and rivers in the British Isles has probably changed. In some cases this change may be large for example as a result of flood defence schemes and is easily observed, whilst in other cases altered land use, farming, forestry or urbanization may have resulted in more subtle changes to river features. This working guide draws together a way of assessing habitat in any stream or river and determine sites or reaches on the assessed watercourse that may benefit from habitat improvement schemes. It will determine a method of measuring existing habitat in a broad sense, whilst referring to R and D studies currently being undertaken in this area. A method of prioritising any proposed habitat restoration work will be suggested. The limitations of fisheries improvement schemes in terms of cross functional acceptance (flood defence and conservation) will be examined along with suggested proposals for some example watercourses. The need for pre and post enhancement monitoring will be discussed as will the requirement for maintenance programs on schemes. Finally methods for determining the cost benefits of small schemes will be examined, compared to other currently used enhancement strategies. This will allow small scale revenue schemes to be used to back up pre project cost benefit analysis as required in future capital submissions.
    Description: Environment Agency Archives North West
    Keywords: Conservation ; Fisheries ; Limnology ; England ; Cumbria ; River fisheries ; Fishery regulations ; Habitat improvement (biological) ; Environmental degradation ; Salmon fisheries ; Classification
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 75
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    Summary document of the work being done in 1992-1993 regarding the migratory salmonid fisheries of the River Ribble catchment (2021)
    National Rivers Authority North West
    In:  dis@fba.org.uk | http://aquaticcommons.org/id/eprint/8081 | 1256 | 2012-03-02 12:59:28 | 8081 | Environment Agency, UK (Freshwater Biological Association)
    Details
    Publication Date: 2021-06-28
    Description: This document lists the work on salmonid fisheries in the River Ribble catchment in the north west of England which was done in 1992-93. The document includes the following: analysis of historical catch data from the River Ribble covering 1937-1991; Ribble and Hodder stock assessment surveys 1992-93 including Swanside Beck; Ribble catch data from game angling log books 1993; results of salmon scale sampling 1993; results of microtagging programme in Hodder and Ribble 1993; Waddow Weir dish counter data 1993; Winkley Hall (Hodder), Locks Weir and Waddow Hall (Ribble) fish counter data 1993; number of fish and ova from Witcherwell Hatchery 1993.
    Description: Environment Agency Archives North West
    Keywords: Fisheries ; Limnology ; England ; Ribble Catchment ; Salmon fisheries ; Fish counters ; Stock assessment ; Habitat ; Migratory species ; Migrations ; Angling ; Scales ; Tagging ; Salmo salar ; Salmo trutta
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 22
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