Some aspects of population biology of edible orange mud crab, Scylla olivacea (Herbst, 1796) during pre and post monsoon in Setiu Wetlands, Terengganu, Malaysia
2017
Nur Azna Saari | Mohammad Tajuddin Abdul Manaf | Khairulbariyyah Zakaria | Nadirah Musa | Mazlan Abd. Ghaffar | Alia Syafiqah Aznan | Laith Abdul Razzak | Mhd Ikhwanuddin | Wan Norhafizah Wan Ibrahim | Mohd Effendy Abdul Wahid | NorHazwani Hamzah | Zainathan, Sandra Catherine | Najiah Musa | Mohd Azmi Ambak | Shahrul Hafiz Abd Ghani | Faizah Shaharom-Harrison
Population biology is regarded as one of the important domain for nature resource management particularly when any species of economic and social importance is involved. In this study, the population structure of tropical orange mud crab, Scylla olivacea (Herbst 1796) was investigated in a tropical mangrove forest in Setiu Wetlands, Terengganu, Malaysia. This study specifically address some aspects of population biology of this species particularly of sex ratio, carapace width-weight and growth pattern. Mud crabs were sampled during pre and post monsoon season i.e. during October 2014 and January 2015, respectively. Mud crabs were collected using crab-baited collapsible traps in the identified areas. A total of 30 crabs were captured, of which 18 were male (60.0%) and 12 were female (40.0%). The overall sex ratio, male to female for pre monsoon and post monsoon were (and 3:1, respectively. Male’s mud crab were bigger and heavier than females. Positive correlation was observed between carapace width and body weight in both sexes (r2= more than 0.8). Negative allometric growth (b<3) was observed in females during pre-monsoon month. Significant difference (P<0.05) was found between the condition factor (K) of pre monsoon and post monsoon month of both sexes. As such, our results provide some important biological information on the population biology of mud crabs in Setiu Wetlands which may help to reduce the fishing pressure on this crustacean species.
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