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The development of an in vitro brain-pituitary perfusion technique allowed both the measurement of gonadotropin release and the recording of electrical activity in various brain areas of the rainbow trout. 2. 2. GnRH sensitive neurons were found in the nucleus preopticus (NPO). 3. 3. Gonadotropin release was evoked after microinjections of LHRH-A into the pituitary or into the NPO. 4. 4. 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