Some aspects of population biology of edible orange mud crab Scylla olivacea (Herbst 1796) during pre and post monsoon in Setiu Wetlands Terengganu Malaysia

Nur Azna Saari, . and Mohammad Tajuddin Abdul Manaf, . and Khairulbariyyah Zakaria, . and Nadirah Musa, . and Mazlan Abd. Ghaffar, . and Alia Syafiqah Aznan, . and Laith Abdul Razzak, . and Mhd Ikhwanuddin, . and Wan Norhafizah Wan Ibrahim, . and Mohd Effendy Abdul Wahid, . and NorHazwani Hamzah, . and Zainathan Sandra Catherine, . and Najiah Musa, . and Mohd Azmi Ambak, . and Shahrul Hafiz Abd Ghani, . and Faizah Shaharom-Harrison, . Some aspects of population biology of edible orange mud crab Scylla olivacea (Herbst 1796) during pre and post monsoon in Setiu Wetlands Terengganu Malaysia. pp. 29-37. ISSN 1823-8556

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. Males 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 (b3) was observed in females during pre-monsoon month. Significant difference (P0.05) 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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Abstract

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. Males 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 (b3) was observed in females during pre-monsoon month. Significant difference (P0.05) 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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Item Type:	Article
AGROVOC Term:	Scylla olivacea
AGROVOC Term:	Crabs
AGROVOC Term:	Aquatic animals
AGROVOC Term:	Aquatic organisms
AGROVOC Term:	Population structure
AGROVOC Term:	Mangroves
AGROVOC Term:	Mangrove forests
AGROVOC Term:	Seasons
AGROVOC Term:	Dissolved oxygen
AGROVOC Term:	Temperature
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 07:08
URI:	http://webagris.upm.edu.my/id/eprint/24180

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