INDUCED NATURAL SPAWNING IN PONDS AND TANKS

INDUCED NATURAL SPAWNING IN PONDS AND TANKS

       A further step in the controlled breeding of fish is to induce the broodstock through hormonal stimulation before pairing them up in breeding tanks or ponds. Natural production is inadequate due to the low survival of hatchlings caused by factors such as predation, poor water quality, pests and parasites in the natural environment. Apart from the fact that in nature most cultured species, especially Clarias gariepinus, do not spawn year-round, a better control of fry production is required. At the inception of induced breeding trials in Nigeria in the 1980s, the following hormones are used: carp pituitary (fresh and acetone-dried) Desoxycorticosteroneacetate (DOCA), human chronic gonadosterone (HCG) and fresh catfish pituitary. With more research and networking, cheaper and more effective synthetic hormones are now in use, the most popular being Ovaprim used in catfish breeding. Various other derivatives are also available, especially those from Asia such as Suprefact and Motilium from Thailand.

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