Species composition and diel variation of fish caught by traditional longline fishing
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Abstract
The study of fish species composition and diel variation of fish caught by traditional longline fishing was conducted during December 2020 to January 2022. Many sizes of circle hooks ranging from No. 9/0 – No. 18/0 attached with branch lines, main lines and baits (earthworm and small live fish) were used to collect fish samples from 3 stations along the middle Chi River, Maha Sarakham, Thailand. In the current study, a total 414 fish belonging to 9 families with 21 species were found. Pangasius larnaudii was the most dominant species in terms of number (15.2%) whereas Chitala ornate was the most dominant species in terms of weight (35.6%). The most dominant species in terms of %IRI was Hemibagrus wyckioides (16.7%). Total cacth per Unit effort of longline fishing ranged from 0.01 – 15.6 kg•day-1 with an average by 2.8 ± 0.31 kg•day-1. Investigation of diel variation of caught fish during December 2021 to January 2022 found that Hemibagrus wyckioides, Hemibagrus filamentus, Pangasius larnaudii and Mastacembelus armatus were caught during both day and night. Four and 14 fish species were found during the day and night, respectively. Catch per unit effort during the night with an average of 1,845.5 ± 409.1 g. •12 hours-1 was significantly greater than the catch per unit effort during the day with an average of 264.4 ± 132.7 g. •12 hours-1 (p< 0.05). These results suggested that longline fishing should be operated during the night to gain more catch compared to fishing during the day.
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