SPAWNING FREQUENCY AND BATCH FECUNDITY OF JACK MACKEREL, TRACHURUS-SYMMETRICUS, OFF CALIFORNIA DURING 1991

In southern California waters, during March-April 1991, the average ma ture female jack mackerel, Trachurus symmetricus, spawned every 5 days , and eight percent of the females spawned at 1-3 day intervals. The a verage relative batch fecundity was 112 oocytes per gram female weight (without ovary). Batch fecundity was lower for females that had spawn ed within the last 3 days than for females in which no evidence existe d for a previous spawning.