Unanswered Forum Topics

This study was a controlled experiment within in a harbor that investigated the effectiveness of attaching small, reflective objects (8mm wide acrylic glass spheres) to standard gillnets to increase acoustic reflectivity and therefore mitigate bycatch of small, echolocating cetaceans.  The study found that the spheres increased the acoustic backscattering strength and echo, which suggests that the spears would be an effective way to reduce small cetacean bycatch. Gillnets with sphere-sphere distance of 20cm performed best. 

This study was a controlled experiment within in a harbor that investigated the effectiveness of attaching small, reflective objects (8mm wide acrylic glass spheres) to standard gillnets to increase acoustic reflectivity and therefore mitigate bycatch of small, echolocating cetaceans.  The study found that the spheres increased the acoustic backscattering strength and echo, which suggests that the spears would be an effective way to reduce small cetacean bycatch. Gillnets with sphere-sphere distance of 20cm performed best. 

This study was a controlled experiment within in a harbor that investigated the effectiveness of attaching small, reflective objects (8mm wide acrylic glass spheres) to standard gillnets to increase acoustic reflectivity and therefore mitigate bycatch of small, echolocating cetaceans.  The study found that the spheres increased the acoustic backscattering strength and echo, which suggests that the spears would be an effective way to reduce small cetacean bycatch. Gillnets with sphere-sphere distance of 20cm performed best. 

This study was a controlled experiment within in a harbor that investigated the effectiveness of attaching small, reflective objects (8mm wide acrylic glass spheres) to standard gillnets to increase acoustic reflectivity and therefore mitigate bycatch of small, echolocating cetaceans.  The study found that the spheres increased the acoustic backscattering strength and echo, which suggests that the spears would be an effective way to reduce small cetacean bycatch. Gillnets with sphere-sphere distance of 20cm performed best. 

This study was a controlled experiment within in a harbor that investigated the effectiveness of attaching small, reflective objects (8mm wide acrylic glass spheres) to standard gillnets to increase acoustic reflectivity and therefore mitigate bycatch of small, echolocating cetaceans.  The study found that the spheres increased the acoustic backscattering strength and echo, which suggests that the spears would be an effective way to reduce small cetacean bycatch. Gillnets with sphere-sphere distance of 20cm performed best. 

This study tests the impact of skids placed on scallop dredges in various habitats to reduce seabed impact; skids raise the scallop collecting bag 10-11cm off the seabed. The modified skid dredge caught more marketable scallops per unit area, but also retained more bycatch overall and more undersize scallops. Results were habitat specific.

This study tests the impact of skids placed on scallop dredges in various habitats to reduce seabed impact; skids raise the scallop collecting bag 10-11cm off the seabed. The modified skid dredge caught more marketable scallops per unit area, but also retained more bycatch overall and more undersize scallops. Results were habitat specific.

This study tests the impact of skids placed on scallop dredges in various habitats to reduce seabed impact; skids raise the scallop collecting bag 10-11cm off the seabed. The modified skid dredge caught more marketable scallops per unit area, but also retained more bycatch overall and more undersize scallops. Results were habitat specific.

This study tests the impact of skids placed on scallop dredges in various habitats to reduce seabed impact; skids raise the scallop collecting bag 10-11cm off the seabed. The modified skid dredge caught more marketable scallops per unit area, but also retained more bycatch overall and more undersize scallops. Results were habitat specific.

This study tests the impact of skids placed on scallop dredges in various habitats to reduce seabed impact; skids raise the scallop collecting bag 10-11cm off the seabed. The modified skid dredge caught more marketable scallops per unit area, but also retained more bycatch overall and more undersize scallops. Results were habitat specific.

This study analyzes the impacts of annual temporal fishing closures of gillnet fisheries in Lake Saimaa, Finland on bycatch/recovery of the Saimaa ringed seal population from 1991-2021. Results show that  fishing was responsible for 26% of observed mortality and 90% of that was from gillnet entanglement, but most bycatch mortalities are likely not observed and therefore underestimated. Longer temporal coverage of annual closures would improve juvenile survival, but the coverage may be regionally adequate. 

This study analyzes the impacts of annual temporal fishing closures of gillnet fisheries in Lake Saimaa, Finland on bycatch/recovery of the Saimaa ringed seal population from 1991-2021. Results show that  fishing was responsible for 26% of observed mortality and 90% of that was from gillnet entanglement, but most bycatch mortalities are likely not observed and therefore underestimated. Longer temporal coverage of annual closures would improve juvenile survival, but the coverage may be regionally adequate. 

This study analyzes the impacts of annual temporal fishing closures of gillnet fisheries in Lake Saimaa, Finland on bycatch/recovery of the Saimaa ringed seal population from 1991-2021. Results show that  fishing was responsible for 26% of observed mortality and 90% of that was from gillnet entanglement, but most bycatch mortalities are likely not observed and therefore underestimated. Longer temporal coverage of annual closures would improve juvenile survival, but the coverage may be regionally adequate. 

This study analyzes the impacts of annual temporal fishing closures of gillnet fisheries in Lake Saimaa, Finland on bycatch/recovery of the Saimaa ringed seal population from 1991-2021. Results show that  fishing was responsible for 26% of observed mortality and 90% of that was from gillnet entanglement, but most bycatch mortalities are likely not observed and therefore underestimated. Longer temporal coverage of annual closures would improve juvenile survival, but the coverage may be regionally adequate. 

This study analyzes the impacts of annual temporal fishing closures of gillnet fisheries in Lake Saimaa, Finland on bycatch/recovery of the Saimaa ringed seal population from 1991-2021. Results show that  fishing was responsible for 26% of observed mortality and 90% of that was from gillnet entanglement, but most bycatch mortalities are likely not observed and therefore underestimated. Longer temporal coverage of annual closures would improve juvenile survival, but the coverage may be regionally adequate.