Bycatch mitigation Fact-sheet; Introduction: Seabird bycatch mitigation measures

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This series of 14 Seabird Bycatch Mitigation Factsheets describes the range of potential mitigation measures available to reduce seabird bycatch in longline and trawl fisheries. The sheets assess the effectiveness of each measure, highlight their limitations and strengths, and make best practice recommendations for their effective adoption. They are designed to help decision-makers choose the most appropriate measures for their longline and trawl fisheries.

Bycatch mitigation Fact-sheet 1; Demersal Longline: Streamer lines

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Streamer lines are the most commonly prescribed mitigation measures for longline fisheries and are regarded as one of the most effective known mitigation measures (a primary measure). Streamer lines are cheap, simple to use and do not require modification of the fishing gear.

Bycatch mitigation Fact-sheet 2; Demersal Longline: Line weighting – external weights

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Seabirds are vulnerable to mortality during the short period between hooks leaving the vessel and sinking beyond the bird’s diving range. Line weighting is an essential component of seabird bycatch mitigation strategies, being one of the more effective known mitigation measures (a primary measure). Best practice weighting regimes should result in rapid initial line sink rates that will reduce the likelihood of seabird bycatch.