Abstract
Two distinct gonadotropins, GtH I and GtH II have been evidenced in most of the teleost species, especially in salmonids. GtH II release is controlled by a dopaminergic inhibitory tone. An oestrogenic activation of a dopaminergic preoptico-hypophysial pathway should be involved in the rainbow trout. GtH I release depends in salmonids upon a negative oestrogenic feedback, but a control by catecholamines is not evidenced. Some targets of sexual steroids on catecholaminergic neurones in fish are evoked.
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