. Commercial fisheries review. Fisheries; Fish trade. 42 COMMERCIAL FISHERIES REVIEW Vol. 20, No. 1. North Pacific Exploratory Fishery Program THIRD MIDWATER TRAWLING CRUISE COMPLETED (M/V John N_. Cobb Cruise 34): Varied results were experienced during several weeks of midwater trawling experiments by the U. S. Bureau of Commercial Fisheries exploratory fish- ing vessel John N. Cobb. The vessel returned to Seattle on November 8, 1957, from a cruise in waters off the Washing- ton and British Columbia coasts - - the third midwater trawling trip this year to determine commer- cial fishing potent
. Commercial fisheries review. Fisheries; Fish trade. 42 COMMERCIAL FISHERIES REVIEW Vol. 20, No. 1. North Pacific Exploratory Fishery Program THIRD MIDWATER TRAWLING CRUISE COMPLETED (M/V John N_. Cobb Cruise 34): Varied results were experienced during several weeks of midwater trawling experiments by the U. S. Bureau of Commercial Fisheries exploratory fish- ing vessel John N. Cobb. The vessel returned to Seattle on November 8, 1957, from a cruise in waters off the Washing- ton and British Columbia coasts - - the third midwater trawling trip this year to determine commer- cial fishing potential for this new type of gear. Using nylon midwater trawls with square openings of approxi- mately 60 feet and 70 feet, the John N. Cobb made fair to good catches of several species of fish over the offshore continental shelf. However, as on previous trips, no significant quantities of the more valuable commercial species, such as cod or Pacific ocean perch, MiowATER TRAWL DEPRESSOR WITH RUNNERS FOR TOW- were located in midwater. ING CLOSE TO BOTTOM. The largest midwater catches contained black rockfish, hake, and dogfish. In a 20-minute tow with the net at 64-68 fathoms over a bottom depth of 70 fathoms, 930 pounds of black rockfish were taken. The best catch of hake was 2,500 pounds in 45 minutes, towing at 79-83 fathoms where the water was 90-97 fathoms deep. Another tow at 53-69 fathoms over bot- tom depths of 83-87 fathoms caught a ton of hake in 30 minutes. Extensive midwater echo traces on Swiftsure Bank were verified as schools of dogfish. One tow in this area produced 6,500 pounds of dogfish in 15 minutes with the net at 27-30 fathoms and a bottom depth of 37 fathoms. Another 30-minute tow caught 4,500 pounds of dogfish and 25 pounds of herring. Both herring and saury were observed over a good part of Swiftsure Bank, but neither species was sufficiently schooled for good midwater trawling results. In cooperation with the Washington State Department of Fisheries, severa
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