By examining relevant studies related to fishing in the open ocean, researchers have found that while using circle instead of J-shaped hooks and fish instead of squid for bait may avoid harm to sea turtles, dolphins, certain whales, and possibly seabirds, it may increase the catch and injury of some sharks and rays.
The findings indicate the importance of assessing the conflicts as well as mutual benefits of bycatch mitigation methods amongst and within species.
"Findings suggest that fishery-specific assessments are warranted to determine relative risks of affected populations of conservation concern" said Dr. Eric Gilman, lead author of the Fish and Fisheries article.
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Eric Gilman et al. A cross-taxa assessment of pelagic longline by-catch mitigation measures: conflicts and mutual benefits to elasmobranchs, Fish and Fisheries (2016). DOI: 10.1111/faf.12143