. Commercial fisheries review. Fisheries; Fish trade. December 1952 COMMERCIAL FISHERIES REVIEW FURTHER EXPERIMENTS ON THE ESCAPE OF UNDERSIZED HADDOCK THROUGH OTTER TRAWLS By John R. Clark* INTRODUCTION The results of the first of a series of recent experiments on the escape of haddock through otter-trawl meshes were reported in the September issue of this journalo In that series of experiments, nets with cod ends of 4-- and 55-inch mesh (between knot centers, new) were tested on two trips of the otter trawler Kichigan in June (1952), This report presents results of experiments with cod ends
. Commercial fisheries review. Fisheries; Fish trade. December 1952 COMMERCIAL FISHERIES REVIEW FURTHER EXPERIMENTS ON THE ESCAPE OF UNDERSIZED HADDOCK THROUGH OTTER TRAWLS By John R. Clark* INTRODUCTION The results of the first of a series of recent experiments on the escape of haddock through otter-trawl meshes were reported in the September issue of this journalo In that series of experiments, nets with cod ends of 4-- and 55-inch mesh (between knot centers, new) were tested on two trips of the otter trawler Kichigan in June (1952), This report presents results of experiments with cod ends of 5g- and 63-inch (between knot centers) mesh aboard another trawler later in the year. METHODS The experiments were conducted on a regular fishing trip of the large otter trawler Wisconsin (fig. 1) from October 14 to 23 on Georges Bank. The procedure followed was essentially the same as used on the Michigan cruises. A 5e-inch (between knot centers) cod end was used on a standard No. 41 otter trawl with a belly of 5-inch (between knot centers) mesh throughout, A 62-inch. THE OTTER TRAWLER WISCONSIN. (between knot centers) cod end was used on a Standard 1^ Iceland trawl with a belly of 5^-inch (between knot centers) mesh throughout. Both cod ends were con- structed of 50-yard, 4-thread, double twine. The 5-inch belly used on the No. 41 trawl was constructed of 75-yard, 4-thread, single twine; the 5^-inch belly used on the Iceland trawl was constructed of 60-yard, 4-thread, single twine. The cod ends were covered with a bag of 1^-inch, 24-thread cotton shrimp net- ting to catch the escaped fish. Results from the previous cruises had shown that * FISHERY RESEARCH BIOLOGIST, NORTH ATLANTIC FISHERY INVESTIGATIONS, BRANCH OF FISHERY BIOLOGY, U. S. FISH AND WILDLIFE SERVICE, WOODS HOLE, MASSACHUSETTS. NOTE: WEIGHT OF TWINE IS EXPRESSED IN NUMBER OF YARDS PER Please note that these images are extracted from scanned page images that may have been digitally enhanced for readabil
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