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  • Articles  (415)
  • Fisheries  (248)
  • Computational Chemistry and Molecular Modeling  (167)
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  • Articles  (415)
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  • 1
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    Fishery dynamics of the California market squid (Loligo opalescens), as measured by satellite remote sensing (2021)
    In:  http://aquaticcommons.org/id/eprint/15091 | 403 | 2014-05-28 03:25:50 | 15091 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-02
    Description: Novel data on the spatial and temporal distribution of fishing effort and population abundance are presented for the market squid fishery (Loligo opalescens) in the SouthernCalifornia Bight, 1992−2000. Fishing effort was measured by the detection of boat lights by the Defense MeteorologicalSatellite Program (DMSP) Operational Linescan System (OLS).Visual confirmation of fishing vessels by nocturnal aerial surveys indicated that lights detected by satellites arereliable indicators of fishing effort. Overall, fishing activity was concentrated off the following Channel Islands: Santa Rosa, Santa Cruz, Anacapa, and Santa Catalina. Fishing activity occurred at depths of 100 m orless. Landings, effort, and squid abundance (measured as landings per unit of effort, LPUE) markedly declinedduring the 1997−98 El Niño; landings and LPUE increased afterwards. Within a fishing season, the location of fishing activity shifted from the northern shores of Santa Rosa and Santa Cruz Islands in October, the typical starting date for squid fishing in the Bight, to the southern shores by March, the typical end of the squidseason. Light detection by satellites offers a source of fine-scale spatial and temporal data on fishing effort forthe market squid fishery off California, and these data can be integrated with environmental data and fishing logbook data in the development of a management plan.
    Keywords: Fisheries ; Management
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 661-670
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  • 2
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    The geographic basis for population structure in Fraser River chinook salmon (Oncorhynchus tshawytscha) (2021)
    In:  http://aquaticcommons.org/id/eprint/15120 | 403 | 2014-05-28 03:57:57 | 15120 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-03
    Description: We surveyed variation at 13 microsatellite loci in approximately 7400 chinook salmon sampled from 52 spawning sites in the Fraser River drainage during 1988–98 to examine the spatial and temporal basis of population structure in the watershed. Genetically discrete chinook salmon populations were associated with almost all spawning sites, although gene flow within some tributaries prevented or limited differentiation among spawning groups. The mean FST value over 52 samples and 13 loci surveyed was 0.039. Geographic structuring of populations was apparent: distinct groups were identified in the upper, middle, and lower Fraser River regions, and the north, south, and lower Thompson River regions. The geographically and temporally isolated Birkenhead River population of the lower Fraser region was sufficiently genetically distinctive to be treated as a separate region in a hierarchial analysis of gene diversity. Approximately 95% of genetic variation was contained within populations, and the remainder was accounted for by differentiation among regions (3.1%), among populations within regions (1.3%), and among years within populations (0.5%).Analysis of allelic diversity and private alleles did not support the suggestion that genetically distinctive populations of chinook salmon in the south Thompson were the result of postglacial hybridization of ocean-type and stream-type chinook in the Fraser River drainage. However, the relatively small amount of differentiation among Fraser River chinook salmon populations supports the suggestion that gene flow among genetically distinct groups of postglacial colonizing groups of chinook salmon has occurred, possibly prior to colonization of the Fraser River drainage.
    Keywords: Fisheries ; Management
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 229-243
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  • 3
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    Evaluation and application of microsatellites for population identification of Fraser River chinook salmon (Oncorhynchus tshawytscha) (2021)
    In:  http://aquaticcommons.org/id/eprint/15121 | 403 | 2014-05-28 03:59:07 | 15121 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-03
    Description: Variation at 13 microsatellite loci was previously surveyed in approximately 7400 chinook salmon (Oncorhynchus tshawytscha) sampled from 50 localities in the Fraser River drainage in southern British Columbia. Evaluation of the utility of the microsatellite variation for population-specific stock identification applications indicated that the accuracy of the stock composition estimates generally improved with an increasing number of loci used in the estimation procedure, but an increase in accuracy was generally marginal after eight loci were used. With 10–14 populations in a simulated fishery sample, the mean error in population-specific estimated stock composition with a 50-popula-tion baseline was 〈1.4%. Identification of individuals to specific populations was highest for lower Fraser River and lower and North Thompson River populations; an average of 70% of the individual fish were correctly assigned to specific populations. The average error of the estimated percentage for the seven populations present in a coded-wire tag sample was 2% per population. Estimation of stock composition in the lower river commercial net fishery prior to June is of key local fishery management interest. Chinook salmon from the Chilcotin River and Nicola River drainages were important contributors to the early commercial fishery in the lower river because they comprised approximately 50% of the samples from the net fishery prior to mid April.
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 243-259
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  • 4
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    Multiple stable reference points in oyster populations: implications for reference point-based management (2021)
    In:  http://aquaticcommons.org/id/eprint/8797 | 403 | 2012-06-11 18:30:07 | 8797 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-27
    Description: In the second of two companion articles, a 54-year time series for the oyster population in the New Jersey waters of Delaware Bay is analyzed to examine how the presenceof multiple stable states affects reference-point–based management. Multiple stable states are described by four types of reference points. Type I is the carrying capacity for the stable state: each has associated with it a type-II reference point wherein surplus production reaches a local maximum. Type-II reference points are separated by an intermediate surplus production low (type III). Two stable states establish a type-IV reference point, a point-of-no-return that impedes recovery to the higher stable state. The type-II to type-III differential in surplus production is a measure of the difficulty of rebuilding the population and the sensitivity of the population to collapse at highabundance. Surplus production projections show that the abundances defining the four types of reference points are relatively stable over a wide range of uncertainties in recruitment and mortality rates. The surplus productionvalues associated with type-II and type-III reference points are much more uncertain. Thus, biomass goals are more easily established than fishing mortality rates for oyster population
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 133-147
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  • 5
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    NMFS / Interagency Working Group Evaluation of CITES Criteria and Guidelines. (2021)
    National Oceanic and Atmospheric Administration, National Marine Fisheries Service | Silver Spring, MD
    In:  http://aquaticcommons.org/id/eprint/8954 | 403 | 2012-07-02 15:05:17 | 8954 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-29
    Description: EXECUTIVE SUMMARY: At present, the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) criteria used to assess whether a population qualifies for inclusion in the CITES Appendices relate to (A) size of the population, (B) area of distribution of the population, and (C) declines in the size of the population. Numeric guidelines are provided as indicators of a small population (less than 5,000 individuals), a small subpopulation (less than 500 individuals), a restricted area of distribution for a population (less than 10,000 km2), a restricted area of distribution for a subpopula-tion (less than 500 km2), a high rate of decline (a decrease of 50% or more in total within 5 years or two generations whichever is longer or, for a small wild population, a decline of 20% or more in total within ten years or three generations whichever is longer), large fluctuations (population size or area of distribution varies widely, rapidly and frequently, with a variation greater than one order of magnitude), and a short-term fluctuation (one of two years or less).The Working Group discussed several broad issues of relevance to the CITES criteria and guidelines. These included the importance of the historical extent of decline versus the recent rate of decline; the utility and validity of incorporating relative population productivity into decline criteria; the utility of absolute numbers for defining small populations or small areas; the appropriateness of generation times as time frames for examining declines; the importance of the magnitude and frequency of fluctuations as factors affecting risk of extinction; and the overall utility of numeric thresh-olds or guidelines.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 70
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  • 6
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    An Index of Abundance for Coastal Species of Juvenile Sharks from the Northeast Gulf of Mexico (2021)
    In:  http://aquaticcommons.org/id/eprint/9790 | 403 | 2012-08-14 20:15:34 | 9790 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-09
    Description: A fishery-independent assessment of juvenile coastal shark populations in U.S. waters of the northeast Gulf of Mexicowas conducted using two methods: gillnets and longlines. Surveys were conducted monthly during April–October in two fixed sampling areas from 1996 to 1998. The Atlantic sharpnose shark, Rhizoprionodon terraenovae, and the blacktip shark, Carcharhinus limbatus, were the most common species captured with either longlines or gillnets. An additional 14 shark species were captured, and juvenileindices of abundance were developed for 8 species with gillnets and 6 species of sharks with longlines. Trends in catch-per-unit-effort were found to vary depending on species. Length-frequency information revealed that the majority of sharks captured were juveniles. Given the direct relationship between stock and recruitment for sharks, continued monitoring of juvenile abundance will aid in determining the strength of the parental stock sizeand for predicting future population strength.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 37-45
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  • 7
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    Identification of Fish Prey of an Irrawaddy Dolphin (Orcaella brevirostris) using Mitochondrial Cytochrome c Oxidase 1 Sequence Analysis (2021)
    In:  http://aquaticcommons.org/id/eprint/26750 | 17342 | 2019-09-12 05:51:58 | 26750 | National Fisheries Research and Development Institute, Philippines
    Details
    Publication Date: 2021-07-24
    Description: This study used mitochondrial cytochrome c oxidase 1 in the identification of the fish prey from the gut samples collected from a stranding of a dead Irrawaddy dolphin in Pulupandan, Negros Occidental. Obtained consensus sequences were searched against the nucleotide database of NCBI and reference sequences, and sample sequences were used for generating the dendrogram and the pairwise genetic distances between species. Results showed that most of the sample sequences were 99% identical to the reference sequences.Eubleekeria splendens and Conger japonicus were the identified species in the stomach contents. E. splendens is a demersal and coastal species while C. japonicus is a demersal species and has not been previously recorded in the Philippines. Conflict in the taxonomy of the Conger genus may suggest that this may be identified as C. jordani. This study reports the first record of fish prey identification of the Irrawaddy dolphin in the country. Continuous monitoring of the Irrawaddy dolphin in the Guimaras Strait, including their feeding ecology, is needed to understand the population further and to improve their conservation.
    Keywords: Ecology ; Fisheries ; Irrawaddy dolphins ; DNA barcoding ; mitochondrial cytochrome c ; oxidase 1 ; gut contents
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-7
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  • 8
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    Analysis of sea turtle bycatch in the commercial shrimp fisheries of Southeast U.S. waters and the Gulf of Mexico (2021)
    NOAA/National Marine Fisheries Service/Southeast Fisheries Science Center | Miami, FL
    In:  http://aquaticcommons.org/id/eprint/2139 | 403 | 2011-09-29 19:32:42 | 2139 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-12
    Description: The coastal shrimp trawl fisheries have long been the focus of conservation actions to reduce turtle bycatch and mortality in the Gulf of Mexico and the U.S. Atlantic (NRC, 1990). Calculation of catch rates of sea turtles in shrimp trawls is necessary to evaluate the impact on sea turtle populations. In this paper we analyze sea turtle bycatch to provide an estimate of the current number of interactions with otter trawl gear as well as an estimate of the number of fatal inions in Southeast U.S. waters and the Gulf of Mexico. We also provide an estimate of the number of individuals likely to die in the future with the new regulations that will require an increase in the size of the escape openings in trutle excluder devices (TEDs). The new regulations will allow many more turtles to escape. Other gears also are discussed. (PDF contains 24 pages)
    Keywords: Management ; Fisheries
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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  • 9
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    The Geographic Distribution of Bowhead Whales, Balaena mysticetus, in the Bering, Chukchi, and Beaufort Seas: Evidence from Whaleship Records, 1849–1914 (2021)
    In:  http://aquaticcommons.org/id/eprint/9714 | 403 | 2012-08-14 16:53:06 | 9714 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-08
    Description: We have extracted, digitized, and analyzed information aboutbowhead whales, Balaena mysticetus, contained in records of whaling cruises that were undertaken in the Bering, Chukchi,and Beaufort Seas from 1849 to 1914. Our database consists of 65,000 days of observations which provide insights into whether this bowhead stock may comprise more than one population.
    Keywords: Conservation ; Fisheries ; Management
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-43
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  • 10
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    Need for harmonized long-term multi-lake monitoring of African Great Lakes (2024)
    Elsevier
    Details
    Publication Date: 2024-05-20
    Description: To ensure the long-term sustainable use of African Great Lakes (AGL), and to better understand the functioning of these ecosystems, authorities, managers and scientists need regularly collected scientific data and information of key environmental indicators over multi-years to make informed decisions. Monitoring is regularly conducted at some sites across AGL; while at others sites, it is rare or conducted irregularly in response to sporadic funding or short-term projects/studies. Managers and scientists working on the AGL thus often lack critical long-term data to evaluate and gauge ongoing changes. Hence, we propose a multi-lake approach to harmonize data collection modalities for better understanding of regional and global environmental impacts on AGL. Climate variability has had strong impacts on all AGL in the recent past. Although these lakes have specific characteristics, their limnological cycles show many similarities. Because different anthropogenic pressures take place at the different AGL, harmonized multilake monitoring will provide comparable data to address the main drivers of concern (climate versus regional anthropogenic impact). To realize harmonized long-term multi-lake monitoring, the approach will need: (1) support of a wide community of researchers and managers; (2) political goodwill towards a common goal for such monitoring; and (3) sufficient capacity (e.g., institutional, financial, human and logistic resources) for its implementation. This paper presents an assessment of the state of monitoring the AGL and possible approaches to realize a long-term, multi-lake harmonized monitoring strategy. Key parameters are proposed. The support of national and regional authorities is necessary as each AGL crosses international boundaries.
    Description: Published
    Description: 101988
    Description: JCR Journal
    Keywords: Fisheries ; Limnology ; Pollution ; Biodiversity ; Climate change ; Erosion
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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