Abstract
The effects of dietary different protein levels on growth performance, body composition, digestive enzyme activity and fecundity were tested in the oriental river prawn Macrobrachium nipponense. Five iso-energetic and iso-lipidic experimental diets were formulated with graded levels of protein [31.34% (A), 33.87% (B), 36.95% (C), 39.56% (D) and 42.58% (E)]. The results showed that M. nipponense fed diets with 39.56% protein level exhibited the best growth performance, survival, feed conversion rate and protein retention. Following the measurement of digestive enzyme activity in treatment D showed significantly improved (p < 0.05) hepatopancreatic amylase and protease activities compared with treatments A and B. Interestingly, dietary protein levels significantly affected the basal composition of eggs. Furthermore, the dietary protein levels of 36.95% and 39.56% showed significantly higher total protein and lipid content in eggs than the control (31.34%). According to the results of berried females, reduced spawning frequency towards the end of the feeding trial period was observed. Broken-line regression analysis indicated that the optimal dietary protein levels for egg quality are 37% (% dry matter) for juvenile Macrobrachium nipponense.
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