ABSTRACT
In the culture of penaeid shrimps, the production of healthy seed of a particular organism in sufficient quantity has hindered the potential farming of the species. Controlled reproductive maturation is the major problem in the development of commercial aquaculture programmes in penaeid shrimps. A better understanding of the mechanism that regulates the reproduction at its ultrastructural levels is fundamental to the successful aquaculture programmes. Controlling reproduction in captivity could help to provide a reliable round the year supply of juveniles, developing selective breeding progr ammes, and for obtaining disease free spawners. Neurosecretory cells are located in different ganglionic centers of the central nervous system and also in the optic ganglion of decapod crustaceans. The X-organ sinus gland complex is the most thoroughly investigated part in crustacean endocrinology, as it is the center of many of the inhibitory hormonal factors, especially the gonad inhibitory factors.
