Author(s): Mizanur Rahman Washim, Syed Lutfor Rahman and Shamsun Nahar

Abstract: Culture potential of SPF (specific pathogen-free) shrimp (Penaeus monodon) was assessed for the period of 63 days in nine on station ponds of Brackish water Station from June to August 2015. Three different stocking densities were examined for each treatment viz.3 PL/m² (T₁), 5PL/m² (T₂) and 7 PL/m² (T₃). Water quality parameters were not significantly (P>0.05) different among the treatments except dissolved oxygen (DO). The growth and survival of SPF (specific pathogen-free) shrimp were higher in T₁ than those obtained from T₂ and T₃ respectively and did not differ significantly (P>0.05). The final weight gain was significantly (P<0.05) higher in T₁ than the other two treatments. Significantly (P<0.05) the lowest food conversion rate (FCR) was in T₃ then followed by T₁ and T₂. The production was highest in T₃ than those of T₂ and T₁ but showed significant (P<0.05) difference among the treatment. However, the highest net benefit was derived from T₃ where the stocking density was 7 PL/m². Meanwhile, the benefit cost ratio (BCR) of T₂ found significantly (P<0.05) higher than T₁ and T₃ which implies that stocking density of 5 PL/m² is more feasible than others. The present study reveals that, lower stocking density of SPF shrimp with short culture period would be appropriate to achieve higher growth, production and net benefit.

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