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Publication
Progress on a meta-analysis for comparing hook, bait and leader effects on target, bycatch and vulnerable fauna interactions
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Advisor(s)
Abstract(s)
This paper describes the progress of an EU Project "Evaluation of the effects of hooks’ shape &
size on the catchability, yields and mortality of target and by-catch species, in the Atlantic Ocean
and adjacent seas surface longline fisheries". At this stage, a meta-analysis of 36 publications
totaling 55 experiments was conducted to assess effects of hook, bait, and leader type on retention
and at-haulback mortality rates of swordfish, blue shark, and loggerhead sea-turtle. Using circle
hooks significantly lowers retention rates of loggerhead sea-turtles and swordfish. Fish bait
significantly reduces the retention of loggerhead sea-turtles but does not significantly affect the
retention of swordfish or blue shark. The effects of using wire leaders could not be assessed for
the loggerhead turtle and significantly increased retention of blue sharks. As for at-haulback
mortality, it was significantly reduced for swordfish when using circle hooks. Fish bait increased
at-haulback mortality of blue shark and was not significant for the other taxa. The effects of using
wire leaders on at-haulback mortality were only possible to calculate for blue shark and were
not significant.
Description
Keywords
Meta-analysis J-hooks Circle hooks Squid Fish Target Bycatch
Citation
Santos, C. C., Rosa, D., & Coelho, R. (2020). PROGRESS ON A META-ANALYSIS FOR COMPARING HOOK, BAIT AND LEADER EFFECTS ON TARGET, BYCATCH AND VULNERABLE FAUNA INTERACTIONS. Collect. Vol. Sci. Pap. ICCAT, 77(4), 182-217.