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Summary: Modified ground gear in the North Sea brown shrimp (Crangon crangon) bottom trawl fishery utilized electromagnetic deterrents and a raised groundrope to obtain catch separation. Preliminary results of the modified gear indicate a selective effect on fish and invertebrate species. Bycatch of various fish and invertebrate species were decreased with a negligible effect on shrimp catch. The results showed great promise, but the authors indicate more testing is necessary.

Summary: Modified ground gear in the North Sea brown shrimp (Crangon crangon) bottom trawl fishery utilized electromagnetic deterrents and a raised groundrope to obtain catch separation. Preliminary results of the modified gear indicate a selective effect on fish and invertebrate species. Bycatch of various fish and invertebrate species were decreased with a negligible effect on shrimp catch. The results showed great promise, but the authors indicate more testing is necessary.

Summary: Modified ground gear in the North Sea brown shrimp (Crangon crangon) bottom trawl fishery utilized electromagnetic deterrents and a raised groundrope to obtain catch separation. Preliminary results of the modified gear indicate a selective effect on fish and invertebrate species. Bycatch of various fish and invertebrate species were decreased with a negligible effect on shrimp catch. The results showed great promise, but the authors indicate more testing is necessary.

Summary: Modified ground gear in the North Sea brown shrimp (Crangon crangon) bottom trawl fishery utilized electromagnetic deterrents and a raised groundrope to obtain catch separation. Preliminary results of the modified gear indicate a selective effect on fish and invertebrate species. Bycatch of various fish and invertebrate species were decreased with a negligible effect on shrimp catch. The results showed great promise, but the authors indicate more testing is necessary.

Summary: Pingers were tested to reduce harbour porpoise (Phocoena phocoena) bycatch in bottom-set gillnets in the Swedish Skagerrak Sea. During the experiment, no harbour porpoise were caught in control or experimental gillnets, possibly as a result of a combination of factors including displacement of porpoise, high prey availability in other areas, or pingers acting as passive reflectors. Pingers did not affect the catch of target species, including cod and pollock.

Summary: Deep water setting techniques, tested on longline gear in Hawaii, reduced bycatch of sea turtles and striped marlin. Bycatch of target species, bigeye tuna, increased 1.27 times.

Summary: Deep water setting techniques, tested on longline gear in Hawaii, reduced bycatch of sea turtles and striped marlin. Bycatch of target species, bigeye tuna, increased 1.27 times.

Summary: Magnets placed above hooks on longline gear created a strong magnetic field to reduce bycatch of nurse, lemon, and 4 additional shark species.

Summary: Streamers added to the warp line of trawl gear reduce bycatch of seabirds attempting to feed on or near trawl fishing gear.

Summary:

A flexible sorting grid placed in trawl gear reduced bycatch of cod and saithe by 95% while only decreasing catch of targeted blue-whiting by 1%. Trials in other fisheries around the world are now underway.