. Commercial fisheries review. Fisheries; Fish trade. June 1958 COMMERCIAL FISHERIES REVIEW 23 DUNGENESS CRAB--YEAR-CLASSES SURVEYED AND OTTER TRAWL AND BEAM TRAWL TESTED FOR SAMPLING (M/V Nautilus Cruise SS-N-l-CrabTi The January 10-January 24, 1958, cruise of the California Department of Fish and Game's small research vessel Nautilus was made in San Francisco Bay and in the ocean area from Pedro Point to Bolinas Bay to continue studies being made on the dungeness crab (Cancer magister). During the cruise, 27 tows with the 10-foot shrimp- mesh beam trawl and the 12-foot shrimp- mesh otter tra
. Commercial fisheries review. Fisheries; Fish trade. June 1958 COMMERCIAL FISHERIES REVIEW 23 DUNGENESS CRAB--YEAR-CLASSES SURVEYED AND OTTER TRAWL AND BEAM TRAWL TESTED FOR SAMPLING (M/V Nautilus Cruise SS-N-l-CrabTi The January 10-January 24, 1958, cruise of the California Department of Fish and Game's small research vessel Nautilus was made in San Francisco Bay and in the ocean area from Pedro Point to Bolinas Bay to continue studies being made on the dungeness crab (Cancer magister). During the cruise, 27 tows with the 10-foot shrimp- mesh beam trawl and the 12-foot shrimp- mesh otter trawl yielded a catch of 33 male and 113 female dungeness crabs. The trip was planned to (1) determine the year-classes of the Dungeness crab (market crab) present in San Francisco Bay and in the ocean from Pedro Point to Bolinas Bay; (2) determine the size of the "crabs-of-the-year" in these two areas; (3) determine the expediency of using the 12-foot shrimp-mesh otter trawl compared to the 10-foot shrimp-mesh beam trawl in crab sampling. The gear used was shrimp experimental gear consisting of a 10-foot beam trawl with a net of 1-inch mesh. This net was fished with floats on the anterior portion of the mouth. The lead line had just enough weight to keep it on the bottom. The otter trawl was a 12-foot wide net of l|-inch mesh. The doors were 4 by 5 feet and weighed aDoroxi- / / _ . ,„ on ^ , <:J-S"c^ dHPKJAl i^/y NAUT ILUS CRUISE 58-N-l JANUARY 10- mately 80 poimds each. 24 1958).. The size of the crabs was recorded. This is the shoulder width, i. e. a caliper measurement just anterior to the most lateral spines. Preliminary inspection of the size frequency record of male crabs was made for groupings reflecting the age classes. This inspection was made with consideration of data from previous cruises. There were 4 and possibly 5 year-classes present. The fifth year-class appears as crabs over 190 millimeters in width; the fourth from 160 to 190 millimeters; th
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