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Laboratory and field tests of an improved water flushing method for removing stomach contents of live fish were conducted on largemouth bass (Micropterus salmoides) and grass pickerel (Esox americanus vermiculatus) and compared with the suction pump, stomach flush, and induced regurgitation methods. Pulsed gastric lagave was not injurious to the fish and, of the methods tested, it enabled procurement of the most accurate samples through the entire range of predator sizes and types of prey foods.
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John Foster (1977) studied this question.
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