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  • 1
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    Comparison of survey methods for estimating abundance of harbor seals (Phoca vitulina) in glacial fjords (2021)
    In:  http://aquaticcommons.org/id/eprint/8877 | 403 | 2012-06-18 09:35:53 | 8877 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-28
    Description: The importance of glacial ice habitats to harbor seals (Phoca vitulina) in Alaska has become increasinglyapparent. However, enumerating harbor seals hauled out on ice in glacial fjords has been difficult. At Johns Hopkins Inlet in Glacier Bay, Alaska, we compared a shore-basedcounting method to a large-format aerial photography method to estimate seal abundance. During each aerial survey, shore-based observers simultaneously counted seals from anobservation post. Both survey methods incurred errors in double-counting and missing seals, especially when ice movements caused seals to drift between survey zones. Advantages of shore-based counts included the ability to obtain multiple counts for relatively little cost, distinguish pups from adults, and to distinguish mobileseals from shadows or glacial debris of similar size. Aerial photography provided a permanent record of eachsurvey, allowing both a reconciliation of counts in overlapping zones and the documentation of the spatialdistribution of seals and ice within the fjord.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 248-255
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  • 2
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    Stocking, Enhancement, and Mariculture of Penaeus orientalis and Other Species in Shanghai and Zhejiang Provinces, China (2021)
    In:  http://aquaticcommons.org/id/eprint/9811 | 403 | 2012-08-16 14:30:11 | 9811 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-09
    Description: China's marine aquaculture landings provide only 18% of its combined freshwater and amrine capture and culture landings, at a per-capita consumption of only 3.2 kg/yr out of a total of 18.1 kg/yr. We described development and some of the results of long-term mariculture and stocking/enhancement projects that have been underway for up to 20 years in the Hangzhou Bay area. Penaeus orientalis (also referred to as P. chinensis) stocking provided up to 400 t/yr, at a total cost-benefit ratio of up to 8 Yuan of landed shrimp per Yuan invested in shrimp stocking. Over 40 t of Penaeus orientalis were produced commercially in 1993, with proceeds being used to fund mariculture and fisheries research. Large scale edible jellyfish restocking is also underway, while semicommercial culture of abalone, Haliotis diversicolor, has been successful. Technical problems limitig mariculture have been solved successfully for some species.
    Keywords: Aquaculture ; Biology ; Ecology ; Fisheries ; Management
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 8-14
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  • 3
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    Fisheries Management: The Kuwaiti Experience (2021)
    In:  http://aquaticcommons.org/id/eprint/9857 | 403 | 2012-08-16 15:43:34 | 9857 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-25
    Description: Siddeek et al. (1991) discussed very briefly some recent developments in Kuwait's shrimp fishery, including an important increase in landings of the main commercial species, Penaeus semisulcatus. This increase coincided with a marked fall in landings of the other important species, Metapenaeus affinis. They thought that these changes were caused by a reduction in effort combined with a more or less simultaneous favorable environmental change for P. semisulcatus and an unfavorable environmental change for M. affinis, but did not give any unequivocal evidence to support this conclusion. The results they reported are, nevertheless, very important and may be relevant to scientists and managers in other parts of the world.
    Keywords: Fisheries ; Management
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 23-30
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  • 4
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    Movements of rockfish (Sebastes) tagged in Northern Puget Sound, Washington (2021)
    In:  http://aquaticcommons.org/id/eprint/2885 | 111 | 2020-08-23 23:48:41 | 2885 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-29
    Keywords: Fisheries ; Biology
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 916-922
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  • 5
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    On preservation of data (2021)
    In:  http://aquaticcommons.org/id/eprint/9335 | 115 | 2012-12-01 06:57:02 | 9335 | WorldFish Center
    Details
    Publication Date: 2021-07-05
    Description: This paper presents, for three aquatic research projects, the type of data that were collected, and the reasons why these data eventually became lost or inaccessible. A strategy for countering such data loss is proposed.
    Keywords: Fisheries ; Information Management ; Data storage ; Data collections ; Fishery data
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 39-40
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  • 6
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    An Assessment of Fishery Yields from the East China Sea Ecosystem (2021)
    In:  http://aquaticcommons.org/id/eprint/9810 | 403 | 2012-08-16 14:30:21 | 9810 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-09
    Description: A first assessment ofimportant East China Sea fisheries was carried out using data from 1956 to 1993. Two different data sets were available: 1) catch and effort data taken from landings and boat registrations and 2) catch and effort data from skipper's logs taken at sea. The two sets provided similar trends in CPUE over the study period. Stocks of high value, low volume species have been fished heavily and now produce very low landings or have been depleted (e.g. small and large yellow croaker). Some high volume and low value species have also been heavily fished (e.g. green filefish) while others (e.g. hairtail) are still producing high landings. Surplus production models were fitted to seven stocks. All showed considerable fluctuations in landings around MSY. The green filefish stock had an estimated MSY of around 160,000 tlyr at an effort of 2,500,000 kw and was depleted by a combination of excessive effort (around 4,000,000 kw in 1993) and marked fluctuations in landings (up to 70,000 tlyr above or below MSY). A sustainable policyfor managing ECS fisheries should address the effects ofboth effort and environmental variation.
    Keywords: Biology ; Ecology ; Fisheries ; Management
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 1-7
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  • 7
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    A simple and objective bioeconomic index for choosing species for culture (2021)
    In:  http://aquaticcommons.org/id/eprint/9336 | 115 | 2012-12-01 06:56:03 | 9336 | WorldFish Center
    Details
    Publication Date: 2021-07-05
    Description: Details are given of the development of a bioeconomic culture index that may be used to assist in choosing fish for culture. This index takes into account growth performance indexes and mean annual prices of the fish. Examples are given of the culture indices of some of Kuwait's commercially important fish species. The proposed indices given realistic output for these fish and allow comparison and evaluation of different taxa with widely differing biological and economic characteristics.
    Keywords: Fisheries ; Information Management ; Bioeconomic culture index ; Fish culture ; Growth ; Species selection ; Kuwait
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 19-21
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