Article: Assessment of skipjack tuna (Katsuwonus pelamis) spawning activity in the eastern Pacific Ocean.(Statistical Data Included)

Abstract--An investigation of skipjack tuna, Katsuwonus pelamis, spawning activity was conducted to test an earlier established and widely accepted hypothesis that significant spawning of skipjack does not occur in the eastern Pacific Ocean (EPO). Skipjack tuna ovaries were collected, from fish greater than 50 cm in length, from commercial landings of purse seiners fishing in the EPO during 1995. A total of 76 samples, each consisting of approximately 25 females, were collected, processed, and analyzed. The characteristics used to classify the reproductive condition of the individual fish were the mean diameter of the oocytes of the most advanced mode and the presence or ...

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