Joint Application Of Trawl And Acoustic Samples In Demersal Fish Assessment Improvement ...
No abstracts are to be cited without prior reference to the author.We consider the spatial structure of biomass distribution in the near-bottom fished depths layer (0-8 m) and analyze the trawl and acoustic density samples (the South Georgia Subarea, surveys 2000-2002) on the basis of the acoustic m...
| Main Authors: | , , |
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| Format: | Article in Journal/Newspaper |
| Language: | unknown |
| Published: |
ASC 2004 - R - Theme session
2024
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.17895/ices.pub.25349713.v1 https://ices-library.figshare.com/articles/conference_contribution/Joint_Application_Of_Trawl_And_Acoustic_Samples_In_Demersal_Fish_Assessment_Improvement/25349713/1 |
| Summary: | No abstracts are to be cited without prior reference to the author.We consider the spatial structure of biomass distribution in the near-bottom fished depths layer (0-8 m) and analyze the trawl and acoustic density samples (the South Georgia Subarea, surveys 2000-2002) on the basis of the acoustic measurements performed during bottom trawl surveys of icefish (Champsocephalus gunnari). Density estimates obtained in simultaneous trawl and acoustic samples on each trawl station are compared. Considerable difference of icefish biomass estimates based on simultaneous density samples obtained using two methods is demonstrated. Biomass estimates are accompanied by statistical characteristics, obtained with the bootstrap method. Fish density distribution in the near-bottom layer between trawl stations is analyzed and compared to the density estimates on trawl stations. The impact of icefish distribution heterogeneity on the bottom trawl survey results is shown. The results of catchability estimates of the survey ... |
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