Unanswered Forum Topics

This study attempts to develop a global dataset of longline fisheries using four years of GPS data from the global longline fleet in order to reduce bycatch of seabirds such as albatross. Results show that over 40 % of the ocean is, at least annually, within 30 km of a set, and this is the distance within which an albatross can detect a vessel. Additionally, the vast majority at sets occur during daylight hours even though setting hooks entirely at night is an effective way to reduce albatross bycatch, and night setting is lower than suggested from on-board observer programs.

This study attempts to develop a global dataset of longline fisheries using four years of GPS data from the global longline fleet in order to reduce bycatch of seabirds such as albatross. Results show that over 40 % of the ocean is, at least annually, within 30 km of a set, and this is the distance within which an albatross can detect a vessel. Additionally, the vast majority at sets occur during daylight hours even though setting hooks entirely at night is an effective way to reduce albatross bycatch, and night setting is lower than suggested from on-board observer programs.

This study attempts to develop a global dataset of longline fisheries using four years of GPS data from the global longline fleet in order to reduce bycatch of seabirds such as albatross. Results show that over 40 % of the ocean is, at least annually, within 30 km of a set, and this is the distance within which an albatross can detect a vessel. Additionally, the vast majority at sets occur during daylight hours even though setting hooks entirely at night is an effective way to reduce albatross bycatch, and night setting is lower than suggested from on-board observer programs.

This study attempts to develop a global dataset of longline fisheries using four years of GPS data from the global longline fleet in order to reduce bycatch of seabirds such as albatross. Results show that over 40 % of the ocean is, at least annually, within 30 km of a set, and this is the distance within which an albatross can detect a vessel. Additionally, the vast majority at sets occur during daylight hours even though setting hooks entirely at night is an effective way to reduce albatross bycatch, and night setting is lower than suggested from on-board observer programs.

This study summarized data from bycatch of marine birds in Alaska salmon gillnet fisheries from 1990-2013 in order to model and estimate bycatch rates. Bycatch was highly variable by area and year, but common murres (Uria aalge) and marbled murrelets (Brachyramphus marmoratus) were highest, and longer soaking time indicated higher likelihood of seabird bycatch. The authors suggest the following practices to reduce seabird bycatch: tending nets more frequently, ensuring nets remain clean and under tension, and reducing/stopping effort during night and twilight.

This study summarized data from bycatch of marine birds in Alaska salmon gillnet fisheries from 1990-2013 in order to model and estimate bycatch rates. Bycatch was highly variable by area and year, but common murres (Uria aalge) and marbled murrelets (Brachyramphus marmoratus) were highest, and longer soaking time indicated higher likelihood of seabird bycatch. The authors suggest the following practices to reduce seabird bycatch: tending nets more frequently, ensuring nets remain clean and under tension, and reducing/stopping effort during night and twilight.

This study summarized data from bycatch of marine birds in Alaska salmon gillnet fisheries from 1990-2013 in order to model and estimate bycatch rates. Bycatch was highly variable by area and year, but common murres (Uria aalge) and marbled murrelets (Brachyramphus marmoratus) were highest, and longer soaking time indicated higher likelihood of seabird bycatch. The authors suggest the following practices to reduce seabird bycatch: tending nets more frequently, ensuring nets remain clean and under tension, and reducing/stopping effort during night and twilight.

This study summarized data from bycatch of marine birds in Alaska salmon gillnet fisheries from 1990-2013 in order to model and estimate bycatch rates. Bycatch was highly variable by area and year, but common murres (Uria aalge) and marbled murrelets (Brachyramphus marmoratus) were highest, and longer soaking time indicated higher likelihood of seabird bycatch. The authors suggest the following practices to reduce seabird bycatch: tending nets more frequently, ensuring nets remain clean and under tension, and reducing/stopping effort during night and twilight.

This study summarized data from bycatch of marine birds in Alaska salmon gillnet fisheries from 1990-2013 in order to model and estimate bycatch rates. Bycatch was highly variable by area and year, but common murres (Uria aalge) and marbled murrelets (Brachyramphus marmoratus) were highest, and longer soaking time indicated higher likelihood of seabird bycatch. The authors suggest the following practices to reduce seabird bycatch: tending nets more frequently, ensuring nets remain clean and under tension, and reducing/stopping effort during night and twilight.

This paper reports on successful seabird mitigation methods implemented in a CCAMLR fishery. The sub-Antarctic Patagonian toothfish fisheryhad a high seabird bycatch mortality rate, particularly of black-browed albatross and white-chinned petrels, when it began (>5,000 birds per 1,000 hooks); due to successful mitigation measures and compliance, it has since significantly reduced (<0.01 bird per 1,000 hooks).

This paper reports on successful seabird mitigation methods implemented in a CCAMLR fishery. The sub-Antarctic Patagonian toothfish fisheryhad a high seabird bycatch mortality rate, particularly of black-browed albatross and white-chinned petrels, when it began (>5,000 birds per 1,000 hooks); due to successful mitigation measures and compliance, it has since significantly reduced (<0.01 bird per 1,000 hooks).

This paper reports on successful seabird mitigation methods implemented in a CCAMLR fishery. The sub-Antarctic Patagonian toothfish fisheryhad a high seabird bycatch mortality rate, particularly of black-browed albatross and white-chinned petrels, when it began (>5,000 birds per 1,000 hooks); due to successful mitigation measures and compliance, it has since significantly reduced (<0.01 bird per 1,000 hooks).

This paper reports on successful seabird mitigation methods implemented in a CCAMLR fishery. The sub-Antarctic Patagonian toothfish fisheryhad a high seabird bycatch mortality rate, particularly of black-browed albatross and white-chinned petrels, when it began (>5,000 birds per 1,000 hooks); due to successful mitigation measures and compliance, it has since significantly reduced (<0.01 bird per 1,000 hooks).

This paper reports on successful seabird mitigation methods implemented in a CCAMLR fishery. The sub-Antarctic Patagonian toothfish fisheryhad a high seabird bycatch mortality rate, particularly of black-browed albatross and white-chinned petrels, when it began (>5,000 birds per 1,000 hooks); due to successful mitigation measures and compliance, it has since significantly reduced (<0.01 bird per 1,000 hooks).

Using modeling (specifically Bayesian multilevel network meta-regression modelling), this  study presents a synthesis of the effectiveness of alternative pelagic longline weighting in mitigating seabird bycatch.  There is a high probability (97%) that all weighting designs do reduce seabird bycatch when compared to no weight, but the designs with weights >60g and >1m from the hook performed significantly better than designs with less weight but attached closer to the hook. 

Using modeling (specifically Bayesian multilevel network meta-regression modelling), this  study presents a synthesis of the effectiveness of alternative pelagic longline weighting in mitigating seabird bycatch.  There is a high probability (97%) that all weighting designs do reduce seabird bycatch when compared to no weight, but the designs with weights >60g and >1m from the hook performed significantly better than designs with less weight but attached closer to the hook.