The effects of an underwater long-line setting funnel on the incidental capture of albatrosses Diomedeidae and petrels Procellariidae in the sub-Antarctic Indian Ocean, off the coast of the Prince Edward Islands, South Africa
Published source details
Ryan P.G. & Watkins B.P. (2002) Reducing incidental mortality of seabirds with an underwater longline setting funnel. Biological Conservation, 104, 127-131
Published source details Ryan P.G. & Watkins B.P. (2002) Reducing incidental mortality of seabirds with an underwater longline setting funnel. Biological Conservation, 104, 127-131
This study is summarised as evidence for the following.
Set lines underwater to reduce seabird bycatchAction Link
Set lines underwater to reduce seabird bycatch
A replicated, controlled study in a South African fishery, between 1998 and 2000 (Ryan & Watkins 2002) found that seabird bycatch in longline sets that used an underwater setting funnel was significantly lower than sets that did not use a funnel, both during the day (funnel: 2,255,150 hooks set, 23 petrels, 10 albatross killed, 0.015 birds/1,000 hooks; no funnel: 434,598 hooks set, 20 petrels, 1 albatross killed, 0.048 birds/1,000 hooks) and night (funnel: 317,503 hooks set, 3 petrels and no albatross killed, 0.009 birds/1,000 hooks; no funnel: 2,045,912 hooks set, 56 petrels, one albatross killed, 0.028 birds/1,000 hooks). However, a disproportionate number of albatrosses were killed during day-time sets using the setting funnel. The study took place in the Patagonian toothfish Dissostichus eleginoides fishery off the coast of the Prince Edward Islands.