Evaluation of phosphorus sources in the compounded diets of Penaeus indicus.

Patro, Biswamitra (2000) Evaluation of phosphorus sources in the compounded diets of Penaeus indicus. Masters thesis, Central Institute of Fisheries Education.

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Abstract

A 30- day feeding experiment was conducted to evaluate the efficacy of selected sources of inorganic phosphorus in a diet compounded for juvenile Penaeus indicus. The phosphorus sources tested were calcium phosphate dibasic, sodium phosphate monobasic, potassium phosphate monobasic and a mixture of calcium phosphate dibasic and potassium phosphate monobasic in the ratio 1:1. Ihe efficacy ol the diets was evaluated in terms of weight gain, food conversion ratio (FCR), apparent feed digestibility coefficient and apparent phosphorus digestibility. No significant differences were observed among the treatments (P>0.05) in the response parameters recorded. However the best specific growth rate (4.05+ 0.32), apparent digestibility coefficient (ADC) of the diet (93.58± 2.05) and apparent digestibility of phosphorus (ADP) (55.08±2.05) were recorded for shrimps fed the diet supplemented with sodium phosphate monobasic. but the best FCR (2.00 ± 0.33) was observed with the diet supplemented with a mixture of calcium phosphate dibasic and potassium phosphate monobasic in the ratio 1:1. The present study suggests that a diet containing good quality ingredients with sufficient available P (0.81 %) as in the control diet (diet-1) is adequate to promote survival, growth and phosphorus retention in juvenile P. indicus. However if a supplement source of P is required sodium phosphate monobasic is recommended in the diet as it provided the best response when incorporated in the diet in the tested salinity (17-19 ppt).

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