期刊
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
卷 78, 期 4, 页码 386-399出版社
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cjfas-2020-0266
关键词
-
资金
- National Oceanic and Atmospheric Administration SaltonstallKennedy Program [NA15NMF4270297]
Research conducted on yellowfin tuna in the recreational troll fishery off the US East Coast revealed a higher predation rate for small fish postrelease, leading to a total capture-related mortality rate of 51% for small fish and 8% for large fish.
Distinguishing the cause and magnitude of capture-related mortality (CRM) in fishes is important for effective management. To better understand CRM in yellowfin tuna (Thunnus albacares) released in the recreational troll fishery off the United States east coast, 48 fish (76-127 cm curved fork length, CFL) were monitored for up to 86 days postrelease with survivorship pop-up satellite archival tags. Recovered data indicated 40 fish were alive at the time of tag detachment and eight died, including six from predation, from 0 to 30 days postrelease. Survival model variants were constructed to independently estimate the rates of immediate capture and handling (CH), postrelease (PR), total CRM (CH + PR), and natural mortality (M) for small (<= 103 cm CFL) and large (>103 cm CFL) fish under different hypotheses and causes of mortality. CH was low (0%-8%) for both size classes but predation was an important component of PR, particularly in the small size class. Total CRM was 51% (95% CI: 26%, 81%) for small and 8% (95% CI: 2%, 30%) for large fish.
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