Application of a parametric survival model to understand capture-related mortality and predation of yellowfin tuna (Thunnus albacares) released in a recreational fishery

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...

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Bibliographic Details
Published in:Canadian journal of fisheries and aquatic sciences 2021-04, Vol.78 (4), p.386-399
Main Authors: Kneebone, Jeff, Benoît, Hugues P, Bernal, Diego, Golet, Walt
Format: Article
Language:English
Subjects:
Analysis
Behavior
Body condition
Capture-recapture studies
Fish
Fisheries
Fishing gear
Fork length
Marine
Methods
Modelling
Mortality
Natural mortality
Predation
Predation (Biology)
Satellites
Spacecraft recovery
Sport fishing
Surface temperature
Survival
Survival after airplane accidents, shipwrecks, etc
Tagging
Tagging mortality
Thunnus albacares
Trolling
Tuna
United States
Yellowfin tuna
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Summary: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.
ISSN:0706-652X
1205-7533
DOI:10.1139/cjfas-2020-0266