Organic shrimp is the main export product of the National Organic Agriculture Development
Plan in Thailand. However, organic shrimp farming is limited by high price of the organic
feeds which in turn limits the total protein level and protein sources. To solve this problem and
to develop a management system for organic marine shrimp feed for black tiger prawn
(Penaeus monodon), a trial was conducted to replace the current of 25% fermented soybean
meal protein with 100% of fish meal diet. After rearing shrimp in a cage for 30 days with the
different test diets, the final growth, ADG and survival rates were compared. In addition,
evaluation of fish meal replacement using soybean meal as protein source was conducted in the
laboratory scale for 30 days to compare growth, survival rate, digestibility and percentage of
protein in shrimp muscle. The results show there were no significant differences of shrimp
ADG growth performance and survival rate among the test diets in cage culture experiment.
The laboratory experiment confirmed that 25% fermented soybean replacement was equally
effective to 100% fish meal diets for shrimp growth and performance, although the survival
rate is lower. No significant differences in shrimp digestibility were measured between the
soybean meal replacement and fish meal diets. However the protein in shrimp muscle which
received fish meal diet was higher than soybean meal replacement diet. These results
demonstrate that soybean meal of at least 25% can be replaced by fish meal protein source in
practical organic shrimp feed without compromising production and economic performance