Effect of different levels of energy and different sources of protein on the growth performance, feeding index, survival rate and body composition of juvenile pacific white shrimp

Abstract

The present study was carried out in order to establish an economical affective diet so that the white leg shrimp grows well in the suthern part conditin of Iran. With the consideration of 3 dietary energy levels (E1=262, E2=312 and E3=362 kcal 100 g -1diet) and 6 ratios of fish meal:soybean meal (P1=100%, P2=80%, P3= 60%, P4=40%, P5= 20% and P6=0%), 18 experimental diets were established. Completely randomized design was used to assign 54 polyethylene 300 litrs round tanks provided by aeration and flow through water systems and was stocked by 19 juvenile as 3 replicates to each shrimps (0.77±00 g). After 56 days growing period maximum growth and nutritional performances were respectively observed in the P6E1(containing 100% soybean meal and 262 kcal 100 g -1diet) and P5E1(containing 80% soybean meal and 262 kcal 100 g -1diet). Also most survival rate of the shrimp was in the P5E2 (containing 80% soybean meal and 312 kcal 100 g 1diet) and P3E3 (containing 40% soybean meal and 362 kcal 100 g -1diet) respectively. Results of the present study suggest the possibility replacements of at least 80% of dietary fish meal by soybean meal in the diet of white leg western shrimp in the condition of southern part of Iran