The authors tested bycatch rates in various soak times and durations in shallow-set gillnets in the Atlantic herring (Clupea harengus) bait fishery in Canada. Nearly all bycatch, including seabird, occurred during control (24+ hour) sets as opposed to short (12 hour) daytime or overnight sets. Because seabirds associated with fishing vessels during the daytime, the […]
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Factors associated with bycatch of marine mammals in United Kingdom static net fisheries | Consortium for Wildlife Bycatch Reduction
The authors evaluated factors influencing marine mammal bycatch in static net fishing operations in the UK between 1996 and 2023. Since 2014, harbour porpoise (Phocoena phocoena) bycatch has been decreasing while common dolphin (Delphinus delphis) bycatch has been increasing; grey seal (Halichoerus grypus) and harbour seal (Phoca vitulina) bycatch has been increasing gradually across the […]
Australian sea lion | Consortium for Wildlife Bycatch Reduction
The Australian sea lion population decreased due to harvests in the 17th and 18th centuries and traditional subsistence hunting by aborigines (Goldsworhty & Gales 2008). Isolated reports of deliberate killings have persisted into the 21st century as well (DEWHA 2010). Although the species is now protected by Australian law throughout its range, recovery towards pre-sealing […]
Determining the safety range of electrical pulses for two benthic invertebrates: brown shrimp (Crangon crangon L.) and ragworm (Alitta virens S.) | Consortium for Wildlife Bycatch Reduction
A laboratory study was conducted to determine the impact of an electrical field on mortality rates and histological changes on model marine organisms. The tests were carried out to provide more information on the impact of electrotrawling om marine species. Two species of invertebrates, brown shrimp (Crangon crangon L.0) and king ragworm (Alita virens S.) […]
Seasonal variation in seabird abundance and bycatch at artisanal bottom-set net fisheries in the southern Iberian Atlantic coast | Consortium for Wildlife Bycatch Reduction
This study utilized onboard observations and fishermen interviews to investigate seabird seasonal abundance and interactions with artisanal bottom-set net fisheries off the southern-eastern coast of mainland Portugal between 2020 and 2022. 25 species of seabirds were recorded as bycatch, with lesser black-backed and Yellow-legged gulls (Larus fuscus and Larus michahellis) the most abundant. Great shearwaters […]
Black-browed albatross | Consortium for Wildlife Bycatch Reduction
The Endangered black-browed albatross is threatened throughout its range by commercial fisheries bycatch, primarily from longline vessels. Its vulnerability is due to the fact that, like other albatross species, the black-browed albatross is attracted to the easy food source provided by baited longline hooks, and consequently become hooked and drowned (Reid & Sullivan 2004). Black-browed […]
Does incidental fisheries bycatch in Canadian waters have population level impacts for northern fulmars breeding in Arctic Canada | Consortium for Wildlife Bycatch Reduction
The authors performed multuple analyses to assess northern fulmar (Fulmarus glacialis) bycatch and impacts from the Greenland halibut (Reinhardtius hippoglossoides) fishery in Arctic Canada. Results show that low to average levels of probable bycatch across fulmar populations will likely severely impede recovery or cause long-term declines of the northern fulmar populations in Arctic Canada, and […]
Bycatch in the balance: the trawl fisheries impact on South American sea lions in San Matias Gulf, with comments on other species | Consortium for Wildlife Bycatch Reduction
The authors used onboard observers and fishing records to evaluate marine mammal bycatch in trawl fisheries of the San Matías Gulf, Argentina. Results show that, of 46 incidentally caught species, the American sea lion (Otaria byronia) was caught most frequently, and that catch was associated with proximity to colonies and the target species identity. Significantly […]
Concurrent bycatch and population assessments of Burmeister’s porpoises in northern Peru reveal unsustainable levels of mortality | Consortium for Wildlife Bycatch Reduction
The authors performed onboard surveys (line transects and passive acoustic monitoring) and interviewed gillnet fishers to assess abundance and bycatch of the endemic Burmeister’s porpoises (Phocoena spinipinnis) in northern Peru in 2023. The population abundance in the study area was estimated at 1,696 spatially distributed individuals, with the highest densities found within 25km of shore […]
Use of rapid assessments of fishery bycatch of Humboldt penguins Spheniscus humboldti in Peru and Chile to help identify conservation priorities | Consortium for Wildlife Bycatch Reduction
The authors interviewed 779 fishers to assess the bycatch of Humboldt penguins (Spheniscus humboldti) in small-scale surface and bottom gillnet and purse-seine fisheries in Peru and Chile. Results estimated 4,067 penguins were caught as bycatch in 2023 alone, with the highest rates associated with the following: gillnets, location of larger penguin colonies, larger mesh sizes, […]
Smalltooth Sawfish | Consortium for Wildlife Bycatch Reduction
Bycatch is the most serious issue threatening the smalltooth sawfish today (Seitz & Poulakis 2006; NMFS 2009). The historical range of the species stretched along the coast from New York to Texas, but is now restricted to the coastal waters of Florida (Seitz & Poulakis 2006). Smalltooth sawfish populations have declined so drastically that an […]
Fishery bycatch rates largely driven by variation in individual vessel behaviour | Consortium for Wildlife Bycatch Reduction
The authors used observer data to investigate variations in threatened species bycatch among individual operators with varying performance levels from five industrial fisheries in Australia. High-target and low-bycatch vessels were found in all five fisheries amongst varying gear types, and individual vessels were significant predictors of interaction rates. The authors suggest that fleet-wide bycatch reduction […]
Enhanced data collection in the Canadian Arctic for seabird bycatch information yields highly variable results | Consortium for Wildlife Bycatch Reduction
The authors assessed accurate reporting of seabird bycatch in the Greenland halibut (Reinhardtius hippoglossoides) fishery in northern Canada. The amount of bird bycatch reported by at-sea observers and carcass collections yielded different (0.5-11-fold higher) results from that of the at-sea observers database. This highlights huge discrepancies in methods which suggest that seabird bycatch data is […]
Reducing bycatch with better technology in the Gulf of California shrimp fishery; Final technical and financial report to the Walton Family Foundation, submitted by World Wildlife Fund | Consortium for Wildlife Bycatch Reduction
Bycatch reduction device prototypes (“RS_INP”) (industrial and artisanal versions) were tested on vessels targeting shrimp in the Gulf of California to compare bycatch-to-shrimp ratios, catch efficiency, drag resistence indicators, fuel consumption rate and selectivity with traditional versions. The industrial version of the prototype reduced bycatch-to-shrimp ratios from 20-50% and shrimp production was not reduced. The […]