Abstract
The spawning season and area of Chilean jack mackerel, Trachurus murphyi, outside of 100mile zone of the Chile (south of 30°S) were estimated using the materials collected by mid-water trawl surveys conducted by the Japan Marine Fishery Resources Research Center during the period from 1983 to 1989. The results obtained are as follows: (1) The spawning season was estimated to be in austral summer (January-March). (2) The spawning took place over the oceanic waters off Chile. (3) Maturation size of the jack mackerel was estimated to be 24cm in male and 26cm in feamale in fork length.
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