04568nas a2200469 a 4500 20260817163453.0 220228s2019 th ar ||| 000 eng d .b12333955 AIT Thesis no.AQ-19-02 Weerapol Thitipongtrakul Assessing the potential escapee yield and economic losses of enlarging trawl mesh size : a case study in the inner Gulf of Thailand Pathum Thani, Thailand: Asian Institute of Technology, 2019 105 p. : ill. + 1 online resource Thesis ; no. AQ-19-02 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Aquaculture and Aquatic Resources Management, School of Environment, Resources and Development Thesis (M.Sc.) - Asian Institute of Technology, 2019 The study of potential impacts of the enlarging cod-end mesh size of pair trawl fishery was conducted by simulating the assumed case scenarios through two estimation models. The first model was used to estimate the potential yield of escaped economic juveniles caused by enlarging cod-end mesh size. Five case scenarios with different escape levels of 10%, 15%, 20%, 25% and 30% were simulated. Eleven important economic species were selected as representatives for the escaped juveniles, comprised of four pelagic species, five demersal species and two cephalopod species. The second model was used to estimate the financial impact on pair trawlers if the cod-end mesh sizes were enlarged from current used to 5.0 em and 6.0 ern respectively. The estimation on the second model was based on the escape rate of previous trawl experiment study. The input fishery data were collected from pair trawl vessels operated in the Inner Gulf of Thailand area from January to December 2018. The required biological data of the selected species, market price of fish, and cost and return of pair trawl fishery were used in estimation. The simulation results demonstrated pair trawlers will occasionally lose their income if the cod-end mesh size was enlarged but it would be compensate by the catch of larger sized escaped fish in the near future. The estimated yield and value of escaped juveniles were increased accordingly as increasing of an escape level. The yield was increased differently by species, however, the overall yield of all selected species was increased. There is slightly economic impact on pair trawlers if the cod-end meshes were enlarged to the larger sizes. They would lose about 3.4% of their total income if the cod-end meshes were enlarged to 5.0 ern, and consequentially lose about 8.9% if it was enlarged to 6.0 ern. It is recommended that the government should provide partial support to trawlers, for persuade them and mitigate the occasional loss during changing period. Thus, further practical trawl experiments should be carried out to support the results of the modeling. Marine fishes Thailand Gulf of Thailand Fishery management Thailand Gulf of Thailand Trawlers (Vessels) Thailand Gulf of Thailand Bhujel, Ram C., Chairperson Datta, Avishek, Examination Committee Ministry of Agriculture and Cooperatives (MOAC), Thailand, Scholarship Donor Asian Institute of Technology Fellowship, Scholarship Donor Asian Institute of Technology. Thesis ; no. AQ-19-02 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B06168 .b12333955 mnait m 240422 0 220228 m a m 0 mnait mnait mnarc mnarc 40 61 20 Barcode : 30050120892947 CREATED : 2019-11-19 RECORD # : i13230013 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : - CREATED : 2019-11-19 RECORD # : i13230025 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050211020218 CREATED : 2022-02-28 RECORD # : i13370261 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050211020200 CREATED : 2022-02-28 RECORD # : i13370273 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 8874 8874 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.AQ-19-02 30050120892947 2026-08-17 16:34:53 1 2026-08-17 40 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.AQ-19-02 2026-08-17 16:34:53 2026-08-17 61 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.AQ-19-02 30050211020218 2026-08-17 16:34:53 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.AQ-19-02 30050211020200 2026-08-17 16:34:53 2 2026-08-17 20