The Effect of Different Density on Mud Crab (Scylla paramamosain) Nursing in First Crab Stage

Abstract

The aims this study were to examine the effect of different density on mud crab (Scylla paramamosain) in hapa size 2 x 3 x 1.5 m with 3 replicates of 2 stocking densities 166 and 333 crabs/m2 in the earthen pond. Mud crab were fed with steamed egg three times a day for 30 days. It was conducted during 16 August 2020 – 14 September 2020 at Samutsongkhram Fisheries Research Station. Mud crab with the initial average carapace width were 0.363 ± 0.016 cm and body weight were 0.013 ± 0.001 g, respectively. The result showed that the average carapace width were 2.746 ± 0.098 cm and 2.622 ± 0.05 cm, average weight were 3.491 ± 0.495 g and 3.093 ± 0.246 g, average daily gain were 0.119 ± 0.017 g and 0.106 ± 0.008 g/day, respectively. There was not significant difference (P>0.05). As well as observed survival rates 33.067 ± 0.033 % and 19.658 ± 0.037 %. There was significant difference (P<0.05). It was concluded from the experiment of mud crab in Hapa of in learn of survival rate were at 166 crabs/m2 was the optimum densities.