Abstract:
This study was conducted at Tg.Sedili, Johor Coastal Water area of South
China Sea. The objectives of this study is to determine species composition and to
obtain biological information which included carapace width (CW) - body weight
(BW) relationship, size distribution and sex ratio of mud crab, genus Scylla.
Randomly, 1126 mud crab genus Scylla samples from various species, size range and
sex was measured and weight in July and December 2010. The study shows that the
mud crab species composition was dominated by S. tranquebarica by 36.68%,
followed by S. olivacea at 36.59% and S. paramamosain at 26.73% and no S. serrata
were sampled. The male crabs are significantly bigger and heavier than female mud
crab for all species. The rate of increase in body weight for S. olivacea is more than
two other species which are S. tranquebarica and S. paramamosain. The size range
for S. olivacea is 9-9.9 cm, S. tranquebarica is 10-10.9 cm and S. paramamosain is
11-11.9 cm. The male mud crabs are relatively more abundant than female for S.
olivacea and S. tranquebarica. However, for S. paramamosain, the female mud crab
is more abundant than male.
