Biological characteristics of the catch from 1983-84 Pacific herring, Clupea harengus pallasi, roe fishery in California

Spratt, Jerome D. (1984) Biological characteristics of the catch from 1983-84 Pacific herring, Clupea harengus pallasi, roe fishery in California. Monterey, CA, California Department of Fish and Game, Marine Resources Region, (Marine Resources Administrative Report, 84-4)

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Abstract

The 1983-84 Tomales Bay and San Francisco Bay gill net catch was dominated by 5-, 6-, and 7-yr-old herring, Clupea harengus pallasi. The dominant age classes in the San Francisco Bay roundhaul catch were 2- and 3-yr-old herring. Good recruitment of the 1982 yr class in San Francisco Bay is indicated by the occurrence of 47% 2-yr olds in the roundhaul catch. The mean length of herring in the Tomales Bay gill net catch declined to 199 mm BL, while the mean length of the San Francisco Bay gill net catch increased to 205 mm BL. The mean length of the San Francisco Bay roundhaul catch declined to an all time low of 165 mm BL. The mean weight of all age classes in both Tomales and San Francisco Bays was at least 20% below long-term mean levels. The herring weight loss in 1983 may have resulted from the poor availability of food caused by the 1982-83 El Nino. (20pp.)

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