Stock assessment for the horse mackerel, Trachurus indicus, caught by purse seine and trawl in the Gulf of Suez
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This report describes an assessment of the horse mackerel stock based on catch sampling undertaken during the three seasons from 1979/80 (incl.). Spawning is shown to occur from January through May in each year; and first sexual maturity to occur during the year prior to age 3 years. The recruitment of young fish is concluded as taking place between seasons. Yield per recruit analyses indicate that increases above the contemporary levels of fishing effort would be associated with negligible addi tional catch, and possibly reduced catches; while substantial reductions in fishing effort would be associated with only small consequential decreases in catch. Reduction in the duration of the fishing season, while maintaining fishing efforts constant, are shown likely to be associated with little change in catch.