Species Composition and Index of Relative Importance of Coastal Species Caught by Collapsible Crab Trap in Ban Don Bay
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Abstract
The study on species composition of coastal species caught by collapsible crab traps in Bandon Bay, Surat Thani Province was investigated between October, 2017 and November, 2018. The traps used were rectangular shape of 35x55x17 cubic centimeter. There was three types of mesh used including Type 1 had mesh size of 1 inch net around the body, Type 2 had mesh size of 1 inch net on top and the sides but 2.5 inches on the bottom, and Type 3 had mesh size of 1 inch net around the body. The totally of 26 orders 61 families and 118 species were observed. Crab trap type 1 showed the highest species caught of 109 species, while 98 and 68 species were collected by type 2 and type 3, respectively. Statistics proved that catch per unit effort of crab trap type 1 had significantly higher than type 2 and 3 (P value ≤ 0.01). However, there was no significant difference in number and weight of Blue swimming crab (BSC) caught by three types of trap (P value ≥ 0.05). The index of relative importance indicated that Charybdis affinis, Portunus pelagicus, Takifugu oblongus, Dorippe quadridens, were commonly observed and dominant in Bandon Bay. This finding indicated that using trap type 1 to catch BSC possibly resulted to the reduction of bycatch biomass in Bandon Bay. For sustainable management, this study suggested that encouraging the fishermen to use crab trap of type 3 can reduce exploitation rate of bycatch species in Bandon Bay.
Article Details
บทความที่ได้รับการตีพิมพ์เป็นลิขสิทธิ์ของ วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยอุบลราชธานี
ข้อความที่ปรากฏในบทความแต่ละเรื่องในวารสารวิชาการเล่มนี้เป็นความคิดเห็นส่วนตัวของผู้เขียนแต่ละท่านไม่เกี่ยวข้องกับมหาวิทยาลัยอุบลราชธานี และคณาจารย์ท่านอื่นๆในมหาวิทยาลัยฯ แต่อย่างใด ความรับผิดชอบองค์ประกอบทั้งหมดของบทความแต่ละเรื่องเป็นของผู้เขียนแต่ละท่าน หากมีความผิดพลาดใดๆ ผู้เขียนแต่ละท่านจะรับผิดชอบบทความของตนเองแต่ผู้เดียว
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