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Collecting age and length data from recovered carcasses of filleted rockfish: a new data source for examination of life history characteristics
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2024
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Source: Fishery Bulletin, 122(3), 119-128
[PDF-1.84 MB]
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Journal Title:Fishery Bulletin
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Description:In reports on stock assessments for rockfish species on the West Coast of the United States, the need for additional biological data to provide more accurate estimates of population abundance is commonly cited. Improvement of population estimates is important because those data are used to set catch quotas along this coast of the nation. The recreational charter boat fleet in the state of California has historically landed large amounts of rockfish species; however, vessels in this fleet discard carcasses once fillets have been removed from fish. These carcasses could be a valuable source of age, length, and sex data, with a standardized measurement method used to relate the post-fillet length of carcasses to the pre-fillet length. To determine the feasibility of a program to collect rockfish carcasses for biological data, specimens of 4 rockfish species were captured off the central coast of California and measured before and after filleting. Pre-fillet lengths were accurately predicted on the basis of post-fillet elongate length for blue (Sebastes mystinus), gopher (S. carnatus), copper (S. caurinus), and vermilion (S. miniatus) rockfish. A high percentage (87.5%) of the carcasses had identifiable gonads, a fortunate result because the availability of sex data on measured specimens is an important consideration for species with dimorphic growth. This new data source based on information from carcasses can be used to enhance the length-at-age and life history data available for stock assessments or other biological studies of rockfish populations.
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Source:Fishery Bulletin, 122(3), 119-128
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ISSN:0090-0656
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Rights Information:CC0 Public Domain
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Compliance:Submitted
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