Unanswered Forum Topics

Factors associated with bycatch of marine mammals in United Kingdom static net fisheries

Submitted by allykristan on

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 time period. Influential factors included seasonal patterns, water depth, and level of fishing effort. 

 

 

Read More

Factors associated with bycatch of marine mammals in United Kingdom static net fisheries

Submitted by allykristan on

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 time period. Influential factors included seasonal patterns, water depth, and level of fishing effort. 

 

 

Read More

Factors associated with bycatch of marine mammals in United Kingdom static net fisheries

Submitted by allykristan on

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 time period. Influential factors included seasonal patterns, water depth, and level of fishing effort. 

 

 

Read More

Factors associated with bycatch of marine mammals in United Kingdom static net fisheries

Submitted by allykristan on

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 time period. Influential factors included seasonal patterns, water depth, and level of fishing effort. 

 

 

Read More

Factors associated with bycatch of marine mammals in United Kingdom static net fisheries

Submitted by allykristan on

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 time period. Influential factors included seasonal patterns, water depth, and level of fishing effort. 

 

 

Read More

Factors associated with bycatch of marine mammals in United Kingdom static net fisheries

Submitted by allykristan on

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 time period. Influential factors included seasonal patterns, water depth, and level of fishing effort. 

 

 

Read More

Factors associated with bycatch of marine mammals in United Kingdom static net fisheries

Submitted by allykristan on

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 time period. Influential factors included seasonal patterns, water depth, and level of fishing effort. 

 

 

Read More

Enhanced data collection in the Canadian Arctic for seabird bycatch information yields highly variable results

Study Type
Field study in the wild
Location
northern Canada
Target catch
Greenland halibut (Reinhardtius hippoglossoides)
Effect on bycatch species
mitigation not assessed
Effect on target catch
mitigation not assessed
Bycatch species
Fishing Gear

Enhanced data collection in the Canadian Arctic for seabird bycatch information yields highly variable results

Study Type
Field study in the wild
Location
northern Canada
Target catch
Greenland halibut (Reinhardtius hippoglossoides)
Effect on bycatch species
mitigation not assessed
Effect on target catch
mitigation not assessed
Bycatch species
Fishing Gear

Enhanced data collection in the Canadian Arctic for seabird bycatch information yields highly variable results

Study Type
Field study in the wild
Location
northern Canada
Target catch
Greenland halibut (Reinhardtius hippoglossoides)
Effect on bycatch species
mitigation not assessed
Effect on target catch
mitigation not assessed
Bycatch species
Fishing Gear

Enhanced data collection in the Canadian Arctic for seabird bycatch information yields highly variable results

Study Type
Field study in the wild
Location
northern Canada
Target catch
Greenland halibut (Reinhardtius hippoglossoides)
Effect on bycatch species
mitigation not assessed
Effect on target catch
mitigation not assessed
Bycatch species
Fishing Gear

Enhanced data collection in the Canadian Arctic for seabird bycatch information yields highly variable results

Submitted by allykristan on

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 not accurate.

 

 

 

Read More

Enhanced data collection in the Canadian Arctic for seabird bycatch information yields highly variable results

Submitted by allykristan on

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 not accurate.

 

 

 

Read More

Enhanced data collection in the Canadian Arctic for seabird bycatch information yields highly variable results

Submitted by allykristan on

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 not accurate.

 

 

 

Read More

Altering gillnet soak duration and timing minimizes bycatch and maintains target catch

Study Type
Field study in the wild
Location
Newfoundland and Labrador, Canada
Target catch
Atlantic herring (Clupea harengus)
Effect on bycatch species
no bycatch in short (12 hour) sets
Effect on target catch
significantly lower during short day sets, but no difference between 24+ hour sets and short night set
Reduction technique
Fishing Gear

Altering gillnet soak duration and timing minimizes bycatch and maintains target catch

Study Type
Field study in the wild
Location
Newfoundland and Labrador, Canada
Target catch
Atlantic herring (Clupea harengus)
Effect on bycatch species
no bycatch in short (12 hour) sets
Effect on target catch
significantly lower during short day sets, but no difference between 24+ hour sets and short night set
Reduction technique
Fishing Gear

Altering gillnet soak duration and timing minimizes bycatch and maintains target catch

Study Type
Field study in the wild
Location
Newfoundland and Labrador, Canada
Target catch
Atlantic herring (Clupea harengus)
Effect on bycatch species
no bycatch in short (12 hour) sets
Effect on target catch
significantly lower during short day sets, but no difference between 24+ hour sets and short night set
Reduction technique
Fishing Gear

Altering gillnet soak duration and timing minimizes bycatch and maintains target catch

Submitted by allykristan on

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 authors recommend that fishers set overnight and haul nets in the early morning to minimize seabird bycatch risk. 

 

Read More

Effectiveness of northern shrimp trawls designed to reduce megafauna bycatch

Study Type
Field study in the wild
Location
Gulf of St. Lawrence, Canada
Target catch
Northern shrimp (Pandalus borealis)
Effect on bycatch species
Unknown. No Greenland sharks were observed during the study.
Effect on target catch
No difference in catch rates vs. traditional gear, but a slight reduction in catch of larger shrimp. However, when escape openings were located before the Nordmore grid, rather than at the grid, catch decreased by 18%.
Bycatch species
Reduction technique
Fishing Gear

Effectiveness of northern shrimp trawls designed to reduce megafauna bycatch

Study Type
Field study in the wild
Location
Gulf of St. Lawrence, Canada
Target catch
Northern shrimp (Pandalus borealis)
Effect on bycatch species
Unknown. No Greenland sharks were observed during the study.
Effect on target catch
No difference in catch rates vs. traditional gear, but a slight reduction in catch of larger shrimp. However, when escape openings were located before the Nordmore grid, rather than at the grid, catch decreased by 18%.
Bycatch species
Reduction technique
Fishing Gear