Hormones and the Control of Reproduction in Aquaculture

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Abstract
The role of hormones and compounds probably intervening by hormonal mechanisms in the reproduction of teleosts are considered. First of all, the fundamental part played by the pituitary and its gonadotropic hormone or hormones in the control of reproduction are stressed by discussing problems which are still outstanding. The zoological specificity of gonadotropic hormones, the mechanism of their action, and the possibilities of using mammalian hormones are examined. The intervention of pituitary hormones other than gonadotropins is then considered. The actions of organs, tissues, and hormones secreted before the pituitary (hypothalamus, epiphysis) and that of the same formations and hormones beyond the pituitary, whose intervention is certain or under discussion (sexual steroids, hormones of the interrenal and the chromaffin tissue, ultimobranchial body and calcitonin, thyroid, urophysis) are discussed. Mention is also made of the prostaglandins.The endocrine control of reproductive behavior and the intervention of pheromones in the reproduction of teleosts are discussed. Then the effects in reproduction of certain extrabiological substances are briefly examined (for example, clomiphene citrate, copper acetate, asphalt, petrichor, methallibure).Final emphasis is given to the importance of ecophysiological studies in the endocrine control of reproduction, which should lead to much more natural and less costly techniques by applying data presently at our disposal, regarding hormonal control of reproductive function.

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