Abstract
A study was conducted to assess the effects of different kinds of inorganic fertilizers on the production of fishes in six ponds during October to December 2011. There were three treatments with two replications under each treatment and each of the ponds was stocked with 80 fish fry. In treatments I, II and III, ponds were fertilized fortnightly @ urea 100 g decimal-1, T.S.P. 100 g decimal-1 and urea 50 g decimal-1 + T.S.P. 50 g decimal-1, respectively. Selected water-quality parameters of ponds under study were more or less similar and within the productive range. Mean phytoplankton and zooplankton densities under treatments I, II and III were 57.08 ± 1.35, 8.80 ± 0.09 and 77.29 ± 3.72, 12.88 ± 0.74 and 98.93 ± 1.61, 16.16 ± 1.75 (x103) cells L-1, respectively. The net and gross fish productions of the ponds under treatments I, II and III were 0.85 and 3.11 t ha-1 yr-1 and 1.32 and 3.58 t ha-1 yr-1 and 1.85 and 4.11 t ha-1 yr-1, respectively. Fish production under treatment III was better than those under treatments I and II because plankton population densities under treatment III was the highest. Therefore, the mixed fertilization is suitable for production of plankton that enhance growth and production of fishes. DOI: http://dx.doi.org/10.3329/ijarit.v4i2.22639 Int. J. Agril. Res. Innov. & Tech. 4 (2): 16-21, December, 2014
Highlights
Optimizing production in pond fish culture by the use of fertilizers is an important task
All physical and chemical parameters of the ponds were found to be within the acceptable ranges for fish culture in all treatments
The present study was conducted to evaluate the effects of fertilization on growth and production of fishes in polyculture of tilapia, silver carp and mrigal
Summary
Optimizing production in pond fish culture by the use of fertilizers is an important task. Plankton is the basic food of all the organisms living in the water. Fishes and other aquatic organisms depend on this basic food directly and indirectly. Extensive work on water quality and pond fertilization has been conducted elsewhere (Boyd, 1982) but very few of them have relevance to the Asian carp culture. Both over and under fertilization may cause adverse effects on fish production, water quality and economic returns. It is necessary to evaluate fertilization regimes and recommend appropriate fertilization strategies to farmers in order to maximize fish production, maintain good water quality, reduce environmental bad impact and maximize economic returns
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