File:Commercial fisheries review (1969) (20480486539).jpg

Title: Commercial fisheries review
Identifier: commercialf311969united (find matches)
Year: 1946 (1940s)
Authors: United States. National Marine Fisheries Service; U. S. Fish and Wildlife Service; United States. Bureau of Commericial Fisheries
Subjects: Fisheries; Fish trade
Publisher: (Washington) : National Marine Fisheries Service; (for sale by the Supt. of Docs. , U. S. Govt. Print. Off. )
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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Fig. 8 - This 1,500-pound catch of shrimp could be dumped into the vessel's hand sorting. reduce incidental catch of unwanted cragonid shrimp, (3) improve handling alongside the vessel by lengthening the shrimp bag, and (4) increase the catch of pink shrimp. A second wing trawl was then constructed and tested aboard the Washington. It also had a 100-foot headrope and 106-foot footrope. The wings as observed by scuba divers opened about 5 feet vertically. The inner panel wings were of 2-inch No. 12 knotted nylon. Outer panel wings of g-inchknotless nylon were at- tached to 1 j^-inch No. 18 knotted nylon in the body and shrimp bag sections. Fishing trials with the modified sorting trawl continued to demonstrate the potential of this design. Catches, although still small- er than those of nearby trawlers, were of com - mercial size. Almost no trash was captured with the sorting trawl, and the shrimp could be placed directly into the hold for icing with- out sorting (Fig. 8). On the first day, the catch rates were 1,460 pounds per hour by after washing without time-consuming the Washington with the sorting trawl, 1,380 pounds per hour by Trask (conventional trawli and 1,285 pounds per hour by Western Maid (conventional trawl). The following day the Washington made 2 tows and took 805 pounds per hour, while the Trask took 2,380 pounds per hour, and the Western Maid 2,100 pounds per hour. The BCF shrimp-sorting trawl still re- tained some small shrimp because of its 1^-inch retainer web as compared to lf-inch web of commercial trawls. Table shows age Age Composition of Shrimp Taken October 8-9, 1968, in A 57-Foot Semiballoon Trawl and A BCF Shrimp-Sorting Trawl (Unpublished Data, Oregon Fish Commission) Age Carpace Length 57-Foot Semiballoon Trawl with li-Inch Web z BCF Shrimp- Sorting Trawl with 1-Inch Web lib 1 2 3 & older mm. 15.5-17.5 18.0-21.5 22.0-25.0 % 3.5 61.3 35.1 % 7.0 62.2 30.8

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