Bycatches of common guillemot (Uria aalge) in the Baltic Sea gillnet fishery
In: Biological Conservation. Elsevier: Barking. ISSN 0006-3207; e-ISSN 1873-2917, more
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| Keywords |
Aquatic organisms > Marine organisms > Aquatic birds > Marine birds
By catch
Conservation > Nature conservation
Fisheries
Fisheries > Finfish fisheries > Gadoid fisheries
Fisheries > Finfish fisheries > Salmon fisheries
Fishing > Commercial fishing
Mortality causes
Nets > Fishing gear > Fishing nets > Gillnets
Population functions > Mortality
Gadus morhua Linnaeus, 1758 [WoRMS]; Salmo salar Linnaeus, 1758 [WoRMS]; Uria aalge (Pontoppidan, 1763) [WoRMS]
ANE, Baltic [Marine Regions]
Marine/Coastal |
| Authors | | Top |
- Österblom, H.
- Fransson, B.
- Olsson, O.
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| Abstract |
Bycatch of common guillemots (Uria aalge) appears to be the single most serious threat to the population, and the proportion of recoveries of ringed birds in fishing gear, compared with other finding circumstances, has significantly increased during a 28 year period (P<0.01). Out of 1952 ringed common guillemots reported found between 1972 and 1999 in the Baltic Sea, 980 (50.2%) were caught in fishing gear. The bycatch in set gillnets for cod (Gadus morhua) constituted 22.3%, drift gillnets for salmon (Salmo salar) 65.5%, and other fishing gear 12.2%. The proportion of recoveries in cod gillnets has significantly increased during the study period (P<0.05), while no clear trend was observed in the recoveries in salmon gillnets. The Swedish fishing effort follows a similar pattern for cod but has decreased for salmon. The observed increased use of cod gillnets in the Baltic Sea may have contributed to the observed decrease in adult survival rate, and we provide two different estimates suggesting that significant proportions of the guillemot population are caught annually in the Baltic Sea gillnet fishery. We suggest several available techniques to reduce bycatch in the Baltic Sea fishery. |
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