Lessons from seabird conservation in Alaskan longline fisheries

Autor: Robert M. Suryan, Edward F. Melvin, Shannon Fitzgerald, Kimberly S. Dietrich
Rok vydání: 2019
Předmět:
渔场特异的解决方案
0106 biological sciences
Conservation of Natural Resources
bird scaring lines
减缓影响的最佳实践
Fisheries
Fish species
seabird bycatch
010603 evolutionary biology
01 natural sciences
Demersal zone
Birds
fishery specific solutions
biology.animal
pesquerías demersales con palangre
night setting
captura accesoria de aves marinas
líneas espanta aves
Animals
海鸟兼捕
Northern fulmar
Contributed Papers
historia de caso
Ecology
Evolution
Behavior and Systematics
Nature and Landscape Conservation
soluciones específicas por pesquería
Models
Statistical
Ecology
biology
010604 marine biology & hydrobiology
Fishes
历史案例
mitigación de mejor práctica
Catch per unit effort
底层延绳钓渔场
biology.organism_classification
夜间布设钓竿
Contributed Paper
demersal longline fisheries
Bycatch
Fishery
puesta nocturna
Vigilance (behavioural ecology)
Geography
Fish
Seabird
鸟类警戒线
best practice mitigation
case history
Zdroj: Conservation Biology
ISSN: 1523-1739
0888-8892
DOI: 10.1111/cobi.13288
Popis: Although bycatch of seabirds and other long‐lived species is a critical conservation issue in world fisheries, case studies documenting significant reductions in the mortality of these low‐productivity species in a fishery are rare. We studied progress toward seabird conservation in the Alaskan longline fisheries, one of the largest and most diverse demersal fisheries. We generated annual seabird bycatch rates in 4 target fisheries and all fisheries combined from 23 years of fisheries observer data. We used 0‐inflated negative binomial models to evaluate variables influencing seabird bycatch per unit effort (BPUE) in 2 target fisheries. Following adoption of streamer lines, at first voluntarily and then mandatorily, seabird BPUE was reduced by 77–90%, preventing mortality of thousands of birds per year. Despite this, BPUE increased significantly in 2 of 4 target fisheries since streamer lines were adopted. Although night setting yielded significant reductions (74–97%) in seabird BPUE and significant increases (7–11%) in fish catch per unit effort over daytime setting, nighttime setting increased the BPUE of Northern Fulmar (Fulmarus glacialis) by 40% and nontarget fish species by 5–17%. Thus, best practices to prevent seabird mortalities in longline fisheries varied by species assemblage and fishery. Our results inform global efforts toward fisheries bycatch reduction by illustrating that successful conservation requires fishery‐specific solutions, strong industry support, constant vigilance in analysis and reporting observer data, and ongoing outreach to fleets, especially to vessels with anomalously high BPUE.
Article impact statement: Streamer lines, a seabird bycatch deterrent, reduced seabird bycatch 77–90% over 14 years in Alaskan longline fisheries.
Databáze: OpenAIRE
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