. Commercial fisheries review. Fisheries; Fish trade. 27 Fishing trials of the prototype bottomless trawl were conducted on shrimp grounds near Newport, Oregon. To test the efficiency of the experimental trawl, the John N. Cobb made 2 tows adjacent to a commercial trawl- er, the M/V 'Jaka-B,' which was using a con- ventional, 57-foot, semiballoon trawl. The comparative tows produced about the same amount of shrimp for each vessel. Owing to low availability of shrimp during the testing period, shrimp catches were very small; therefore, results were not conclusive. Further testing is planned. BC
. Commercial fisheries review. Fisheries; Fish trade. 27 Fishing trials of the prototype bottomless trawl were conducted on shrimp grounds near Newport, Oregon. To test the efficiency of the experimental trawl, the John N. Cobb made 2 tows adjacent to a commercial trawl- er, the M/V 'Jaka-B,' which was using a con- ventional, 57-foot, semiballoon trawl. The comparative tows produced about the same amount of shrimp for each vessel. Owing to low availability of shrimp during the testing period, shrimp catches were very small; therefore, results were not conclusive. Further testing is planned. BCF Shrimp-Sorting Trawl In design this new trawl departs radically from conventional shrimp trawls. It has neither a top nor bottom panel but a double wall of webbing in the wings to separate shrimp from fish and bottom debris (Fig. 6). The inner panels of the double-walled wings are of meshes large enough for shrimp to pass through, and the outer panels are of meshes small enough to retain the sorted catch. Size of shrimp contained in the outer bag would naturally be governed by mesh size. Smelt and other fish that tend to swim up- ward could pass over the top of the new trawl. Fish and debris that did not pass through the large meshes of the inner panel in the wings eventually pass through a trash chute out of the trawl unharmed. Because all shrimp were not expected to pass through the wing sieve web, the trash chute was construc- ted of large-mesh web, which would allow some of these shrimp to go into the retainer bag. Those shrimp that continued through the chute without passing through any meshes would eventually be captured in the trash bag, or deposited back onto the sea bed if the ex- ternal portion of the chute was not closed. After construction of the new trawl, diver observations determined that the overall con- figuration was adequate for testing. Fishing Trials Initial field trials of the BCF shrimp- sorting trawl were conducted on shrimp beds off Newport, Oregon. T
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