Population Dynamics and Reproductive Biology of three Sesarmid Crabs in Trat’s Mangrove Forest
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Abstract
The study on population dynamics and reproductive biology of three Sesarmid crabs were conducted in Trat’s mangrove forest in the east of Thailand. Episesarma singaporense showed the highest proportion in catch composition, followed by Episesarma mederi and Episesarma versicolor, respectively. An Allometric growth pattern was found for all of the three species. The asymptotic external carapace widths were 4.40, 4.10, and 4.20 centimeter for E. singaporense, E. mederi, and E. versicolor, respectively. The same value of growth coefficient (i.e. 1.51) was found among these species. The total mortality coefficients were 7.45, 8.40, and 8.18 per year. The natural mortality coefficient was 2.35 per year for all studied crabs. The fisheries mortality coefficients were 5.10, 6.05, and 5.83 per year and the current exploitation levels were 0.68, 0.72, and 0.71, respectively. Two periods of the spawning peaks were found during the year, the first period was between March to June and the second period was around the end of the year i.e. August to December. The average external carapace widths of the berried female were 3.42+0.32, 3.35+0.29, and 3.45+0.29 centimeter for E. singaporense, E. mederi and E. versicolor, respectively.
Article Details
บทความที่ได้รับการตีพิมพ์เป็นลิขสิทธิ์ของ วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยอุบลราชธานี
ข้อความที่ปรากฏในบทความแต่ละเรื่องในวารสารวิชาการเล่มนี้เป็นความคิดเห็นส่วนตัวของผู้เขียนแต่ละท่านไม่เกี่ยวข้องกับมหาวิทยาลัยอุบลราชธานี และคณาจารย์ท่านอื่นๆในมหาวิทยาลัยฯ แต่อย่างใด ความรับผิดชอบองค์ประกอบทั้งหมดของบทความแต่ละเรื่องเป็นของผู้เขียนแต่ละท่าน หากมีความผิดพลาดใดๆ ผู้เขียนแต่ละท่านจะรับผิดชอบบทความของตนเองแต่ผู้เดียว
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