Abstract

This study evaluates the effect of different salinities and four experimental diets on percent specific growth rates (%SGR), weight gain (WG), daily weight gain (DWG), daily growth rate (DGR), relative growth rate( RGR) and survival of Penaeus monodon. Juveniles of P. monodon were cultured at salinities of 5, 10, 15, 20, ppt by feeding with four experimental diets (F1, F2, F3 and F4) for 45 days. In this study, the feed’s fishmeal protein was replaced with concentrated microbial protein as an approach to blue economy challenge and aquaculture sustainability. Results of this study showed that different growth rates of P. monodon were not significantly affected by four different diets. However, significantly lower %SGR was observed at 10 ppt, which ranged from 1.144±1.19 to -0.364±0.53 (P<0.05). No significant differences was observed in DGR (ranged from 10.760±0.08 to -0.253±0.53) as well as in %RGR (ranged from 378.143±26.03 to - 4.553±20.68) values. In contrast, salinities were found to have a significant effect on the combined dependent variable (P< 0.05). However, different feeds, and feed-salinity interaction did not show any significant effect on the variation of combined dependent variables (P>0.05). Finally, test of between subject effects demonstrated that different feeds, salinities, and interaction of feeds and salinities had no significant effect on the individual dependent variable in different tanks (P>0.05). In conclusion, different salinity might affect the culture and production of tiger shrimp in Bangladesh. Although we did not get any effect but further studies with close observation and with proper culture facilities different diets might also impact tiger shrimp production.