Incidental catch and mortality of striped bass, Morone saxatilis, in the commercial bay shrimp trawl fishery in the San Francisco estuarine complex
1991
Reilly, Paul N.
The commercial bay shrimp fishery was monitoredfrom April 1989 to September 1990 in south San FranciscoBay, and from September 1989 to September 1990 inSan Pablo Bay and Carquinez Strait, to estimate incidentalcatch and mortality of young-of-the-year (YOY),juvenile and adult striped bass. Of the total estimatedby-catch of 44,000 to 52,000 YOY bass, 98.5% weretaken in San Pablo Bay. Of the total estimated bycatchof 3160 to 3570 older bass, approximately 75%were taken in San Pablo Bay. Estimated mortality fromshrimp tows was 22% for YOY and 2% for older bass.More than 99% of mortalities occurred in San Pablo Bay.July and August 1990, when YOYs were smallest and mostvulnerable to trawling, was considered a criticalperiod. A reduction in tow duration as well as effortin San Pablo Bay during this period may be effective insignificantly reducing total mortality.(42pp.)
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