Protein Profile and Ammonia Excretion of Mud Crab Scylla serrata with Recirculation System.

Abstract

Mud crabs have a high level of cannibalism so as to increase the growth of maximum mud crab and reduce the level of stress it is necessary environmental manipulation that supports it as a container maintenance with dark and bright conditions. This study aimed to determine the optimum container condition for survival and growth of mud crab by protein profile and ammonia excretion. Mud crab derived from the fisherman Pasuruan East Java with initial weight 45-65 g kept in containers (60×40×30 cm3) in recirculation systems for 42 days with feeding trash fish restricted by 5% twice daily. The study was conducted with two treatments and three replications of bright containers and dark containers. Several stress indicators including protein retention, total serum protein, ammonia secretion were determined and growth performance of the mud crab was also evaluated. The dark container resulted in optimum condition for mud crab indicated by the highest survival 30±6%, specific growth rate 0.44±0.02%/day, absolute longevity 1.29±0.03 cm, absolute weight growth 10.5±0.31 g, protein retention 15.59±0.46% and feed conversion ratio 6.38±0.27. This study concluded that better growth performance was observed in dark container for nursery of mud crabs.