Growth Performance and Yield of Nile Tilapia (Oreochromis niloticus (Linnaeus, 1758)) under Different Stocking Densities and Fertilization Scenarios in Earthen Pond Culture

Adugna Gindaba, Abebe Getahun, Mulugeta Wakjira

Abstract


This experiment was conducted to explore the effects of chemical and organic fertilizers at different levels of stocking density on the growth performance and yield of Nile Tilapia (Oreochromis niloticus (Linnaeus, 1758)) in earthen pond culture in southwestern Ethiopian highland located at an altitude of 1700 m above sea level. The ponds were divided into control and treatment with diammonium phosphate (DAP) and poultry manure application at three levels of stocking densities as 1, 2 and 3 fish m-2 in a completely randomized design. All the experimental ponds had two replicates. The fertilizers were applied to the treatment ponds at a rate of 2 g m-2 perweek for 150 days. Juveniles with mean initial weight of 20.9 0.19 g and mean initial length of 11.51 0.16 cm were stocked.

The results showed that the growth performance parameters (viz. weight gain, daily growth rate and specific growth rate) and yield of Nile Tilapia were dependent on both the stocking density and fertilizer type. The fishes stocked in the ponds treated with DAP at 1 fish m-2 attained the highestmean values on all the growth parameters followed by the fishes stocked in the poultry manure treated ponds at the same rate of density. In contrast, total weight gain and yield increased with an increase in stocking densities, and they were greater in the treatments with DAP than in the treatments with poultry manure at the same loading rate. Therefore, it can be concluded, from this experiment, that the most effective stocking density for Nile Tilapia earthen pond culture is at 1 fish m-2 for larger size fish demand while 3 fish m-2 gives higher gross production or yield with DAP treatment. Survival rate remained fairly similar for all levels of stocking density and fertilizer types.


Keywords


Chemical fertilizer; Diammonium phosphate (DAP); Earthen ponds; Growth performance; Nile Tilapia; Poultry manure; Yield.

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References


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