Effect of stocking density on growth and survival of endangered Mystus bleekeri (Day, 1877) in nursery system.
Journal Title: International Journal of Biological Innovations - Year 2022, Vol 4, Issue 2
Abstract
The effect of stocking densities on growth, survival and production of gulsa tengra, Mystus bleekeri fry and fingerlings were practiced in a nursery rearing system. The experiment was designed with 3 treatments and 3 replications and conducted for seven weeks in nine earthen nursery ponds of 0.032 ha each. Four-days-old hatchlings were stocked at 0.60 million/ha, 0.80 million/ha and 1.0 million/ha was designated as treatment T1¬, T2 and T3. At stocking, hatchlings had a mean length and weight of 0.91±0.01 cm and 0.001±0.01g. Hatchlings in all treatments were fed with 32.90% crude protein and 8.80% crude lipid. Physico-chemical parameters (temperature, transparency, pH, dissolved oxygen and total alkalinity) and plankton populations were at the optimum level for fish culture. The highest weight gain (3.16±0.66g) was measured in treatment T1 and the lowest (2.01±0.88 g) in treatment T3. Final length, final weight and survival of fingerlings followed the similar trends as weight gain. Specific growth rate and feed conversion ratio was significantly better (P<0.05) in treatment T1 followed by treatment T2 and T3. Survival rate was also higher (P<0.05) in treatment T1 than in treatment T2 and T3, respectively. Despite this, higher economic returns (Bd Tk. 367733/ ha) were observed for treatment T1 than from treatment T2 and T3.
Authors and Affiliations
B. K. Chakraborty
Keywords
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- EP ID EP709939
- DOI https://doi.org/10.46505/IJBI.2022.4206
- Views 79
- Downloads 0
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