Author(s): Md. Amirul Islam, Shikder Saiful Islam, Prosenjit Debnath, Joyanta Bir and Khandaker Anisul Huq

Abstract: The present study was conducted to evaluate the effects of C/N ratio on the volume of floc formation as well as on the load of several potential microbes of the fresh water prawn (Macrobrachium rosenbergii) culture tanks. The experiment was designed with three different C/N ratios viz. 10:1, 15:1, and 20:1 as T₁, T₂ and T₃ were applied with a control (C) at laboratory condition. It was observed that C/N ratio 15:1 (12.22 ± 1.08 ml/L) and 20:1 (15.33 ± 1.37 ml/L) gave higher floc development compared to control C (5.22 ± 0.62 ml/L) and T₁ (7.22 ± .46 ml/L) (P<0.05). The loads of Enterococcus spp.was found to be highest in T₂, followed by T₁, C and T₃ (P<0.05). Higher Lactobacilllus spp. load was found in T₁ and T₂ compared to T₃ and C, which indicates that growth of Lactobacillus spp. require a fair range of carbon source. No Salmonella spp. was found in any treatment. The present findings indicate that C/N ratio 15:1 could be applied in sustainable freshwater prawn culture.

DOI: 10.22271/fish.2021.v9.i1d.2417

Pages: 310-317  |  776 Views  136 Downloads

Download Full Article: Click Here