A meta-analysis of online publications revealed only one technique to be effective as a bycatch reduction device in longline fisheries, which involves raising demersal longlines off the seafloor using flotation. Other techniques as BRDs include monofilament leaders which, like floating demersal longlines, are suggested as promising approaches for further evaluation. Although not effective as a deterrent, circle hooks may increase survivaility post-hooking.
This study combines government reports, published journal articles, and data from a questinnaire administered to the fishing industry to assess marine mammal bycatch in Chile.
To see a list of awarded projects go to this link: https://www.bycatch.org/sites/default/files/award%20annnouncement_0.pdf
Three projects in West Africa and Argentina will receive funding to document and mitigate marine mammal bycatch.
A summary of bycatch reduction techniques