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The effect of stocking density on growth performance and survival rate of endangered Labeo bata , was conducted in nursery ponds from 14 th June to 13 th August, 2013. Three different stocking densities viz. 500, 600 and 700 piece -1 decimal were assigned as treatment T 1 , T 2 and T 3 , respectively. The initial average weight of L. bata was 0.15±008 g. Hatchlings in all the nursery ponds were fed indigenous feed (26.95% crude protein) for 8 weeks. Temperature, ammonia nitrogen, pH had no significant differences (P<0.05). Final weight (g) was found to be the highest (4.06±0.06) in T 1 and the lowest (3.20±0.03) in T 3 . The mean values of weight gain (g) was the highest (3.91±0.06) in T 1 and the lowest (3.05±0.03) in T 3 . SGR was highest (5.49±0.02) in T 1 and lowest (5.09±0.02) in T 3 . Yet again, survival rate was highest (70.33±0.88) in T 1 where stocking density was the lowest among those aforementioned three treatments and lowest (61.00±0.58) in T 3 where the stocking density was the highest among the treatments. And finally production (kg -1 ha) was found highest (352.66±4.42) in T 1 and lowest (337.50±3.19) in T 3 . Rearing of the Labeo bata fry in those three different stocking densities showed significant (p<0.05) variation both in highest survival and growth performance. Overall production of L. bata in treatment T 1 was significantly higher than that of the other two treatments T 2 and T 3 . Despite of this, consistently higher CBR was found from treatments T 1 (1:1.78) than from treatment T 2 (1:1.25) and T 3 (1:1.06). J. Environ. Sci. & Natural Resources, 9(1): 67-73 2016

Density-dependent Growth of Endangered Labeo bata (Hamilton, 1822) in Nursery Ponds