Some studies on artificial propagation of tilapia

The relative ease of culture of Tilapia and its rapid growth rate under tropical climates has lead to its widespread distribution in warmwater. However uncontrolled breeding is problem with intensively managed management of these species.These studies were carried out on 1572 healthy sexual mature Tilapia nilotica to through a light on the possibility of artificial propagation of these species. Determining the effective dose of HCG hormone, latency time and the effect of some environmenta, The results revealed that the sutable brood stock for artificial-s, propagation must showed the extemal features of sexual maturity whichappears as rounded and soft belly and red anus of the females with releaseof some eggs by slight pressure on the abdomen. The male must be reddishin colour of the head and trunk region, protrusion of the genital papillaewith release of DROPs of milt by slight pressure on its abdomen. • The dose 2.5 i.u./gm. B. w. ofHCG for female and 1.25 i.u./gm. B. w. of male were sutable for producing satisfactory results for artificial propagation. F ourteen hours for female and 6-10and survivability of the newly hatched larvae. No variation was observed in the quantity of milt at any doses andlatency times in male. While histological examinations revealed that at 6-