Catch Composition and Species Selection of Traditional Traps in the Chi River, Ubon Ratchathani Province
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Abstract
This research aimed to examine catch composition and size selection of aquatic animals, caught by the horizontal and vertical traditional traps, under the difference sampling months and lunar phases. Each trap was 180 cm x 60 cm in size with 3 mesh sizes including 3, 5 and 7 cm. Five traps for each mesh size were used. Therefore, a total of 30 traps (sets) were used, 15 horizontal traps and 15 vertical traps. The study was conducted in the Chi River at Ban Thatnoi, Thatnoi Sub-district, Khuang Nai District, Ubon Ratchathani Province. From the study, 25 species (9 families) of aquatic animals were found, 1 species of shrimp and 24 species of fish. One bird species was accidentally caught during the study. Cyprinidae was the most caught fish family. Fourteen fish species in this family were caught. The overall average catch was 1.15 ± 1.08 kg/night/set. Catches were significantly different among sampling months (p<0.05). The lowest catch was in March 2021 at 0.21 ± 0.10 kg/night/set while the highest catch was in September 2021 at 2.31 ± 1.68 kg/night/set. However, catches were not significantly different (p>0.05) according to trap types and lunar phases. Cluster analysis showed 3 groups of catch composition, according to sampling months and trap types. The lengths of the sampling aquatic animals were between 7.02 - 46.47 (18.25 ± 7.06) cm and significantly different (p<0.001) depending on mesh sizes. The results indicated that sampling month, which related to hydrology cycle, affected the catches of fisheries using traps in the Chi River. Furthermore, fisheries using small mesh-size traps tended to catch aquatic animals with sizes smaller than the size at first maturity. These findings should be taken into a consideration in planning of fisheries management in the Chi River.
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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
บทความที่ได้รับการตีพิมพ์เป็นลิขสิทธิ์ของ วารสารวิทยาศาสตร์และเทคโนโลยี มหาวิทยาลัยอุบลราชธานี
ข้อความที่ปรากฏในบทความแต่ละเรื่องในวารสารวิชาการเล่มนี้เป็นความคิดเห็นส่วนตัวของผู้เขียนแต่ละท่านไม่เกี่ยวข้องกับมหาวิทยาลัยอุบลราชธานี และคณาจารย์ท่านอื่นๆในมหาวิทยาลัยฯ แต่อย่างใด ความรับผิดชอบองค์ประกอบทั้งหมดของบทความแต่ละเรื่องเป็นของผู้เขียนแต่ละท่าน หากมีความผิดพลาดใดๆ ผู้เขียนแต่ละท่านจะรับผิดชอบบทความของตนเองแต่ผู้เดียว
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