STUDIES ON EFFECT OF CLAW-ABLATION ON GROWTH AND SURVIVAL OF Macrobrachium rosenbergii
نویسندگان
چکیده
Sexual dimorphism and differential growth rate is evident in Macrobrachium rosenbergii and one of the major hurdles in the uptake of commercial farming. Two of the main difficulties for communal culture of many crustaceans are cannibalism and the social suppression of the growth. But crustaceans are blessed with ‘Autotomy; regeneration of organs’. There was a statistically significant difference among treatments due to added substrates. Added substrates produced 41% higher survival and significant increase in average prawn weight (P < 0.05). In the second phase, the identified substrate i.e., baked earthen pipe was selected and study was continued to evaluate the optimum stocking density. The different stocking densities tried were 30/m 2 as control and as treatments 40/m 2 , 50/m 2 and 60/m 2 . There was no significant (P > 0.05) interaction between stocking density and presence of added substrate, but there was significant change in the growth rate among treatments. Stocking density of 40/m 2 proved to be better with the higher mean weight of 19.20 ± 0.35 g in 90 days of rearing. This study revealed that baked earthen pipe is a better substrate to increase the survival and growth rate of juvenile of M. rosenbergii both in the nursery and grow out phases, even at a high stocking density of 40/m 2 .
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