The artificial propagation effects comparison of African catfish in rainy season and dry season.

This paper focuses on the problems of the shortage of fish species in the process of aquaculture production in Nigeria,to explore the reproductive law of African catfish in the rainy season and dry season.The reproductive effects of African catfish in different season were compared by using local African catfish fed by native fisherman with artificial propagation of oxytocin,in which induced spawning groups were 14 in rainy season and 10 in dry season with male and female ratio of 1∶2.The results show that the average egg number of per kg female is 29 593 in the rainy season,which is 89.06 percent more than that in dry season,and the best spawning is in August reaching the egg number of 33 330.The fry hatch ratio is 83.66 percent in the rainy season which is higher of 39.3 percent than that in the dry season,and the best hatch ratio is 89.25 percent in July.Nurturing survival rate of the fry is 44.81 percent in the rainy season that is higher of 21.02 percent than that in the dry season,and the best survival rate is 58.31 percent in September.Annually artificial induced spawning breeding of African catfish is practical under an appropriate temperature.