. Commercial fisheries review. Fisheries; Fish trade. 33 METHOD FOR PROTECTING LAKE TROUT TAKEN IN TRAWLS Alfred Larsen and Warren Handwork A rescue device for returning live fish to below-surface depths was used to increase survival of lake trout (Salvelinus namaycush) caught during BCK exploratory trawling in Lake Superior. Lake trout stocks, now being rehabilitated in Lake Superior and other Great Lakes after near extinction by the sea lamprey (I'cti v',0111 niariuus), en mint be fished com mercially at the present time. The develop- meiitofan effective method toreturnlive fish to their hab
. Commercial fisheries review. Fisheries; Fish trade. 33 METHOD FOR PROTECTING LAKE TROUT TAKEN IN TRAWLS Alfred Larsen and Warren Handwork A rescue device for returning live fish to below-surface depths was used to increase survival of lake trout (Salvelinus namaycush) caught during BCK exploratory trawling in Lake Superior. Lake trout stocks, now being rehabilitated in Lake Superior and other Great Lakes after near extinction by the sea lamprey (I'cti v',0111 niariuus), en mint be fished com mercially at the present time. The develop- meiitofan effective method toreturnlive fish to their habitat was prompted by Incidences of losing trout to predatioii l>\ gulls when the fish were released on the surface after their removal from the trawl net. Many lake trout were unable to swim down from the surface upon release because air bladders expand at lower pressures as fish are brought to the surface. Trout that had been returned to the lake often were observed swimming at or near the surface for long periods trying to sub- merge. During these periods the fish are extremely vulnerable to preying gulls. In. Fi, and 4). The interior of the cage was Later lined. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. National Marine Fisheries Service; U. S. Fish and Wildlife Service; United States. Bureau of Commericial Fisheries. [Washington] : National Marine Fisheries Service; [for sale by the Supt. of Docs. , U. S. Govt. Print. Off. ]
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