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Tuna Longline Fishery in the Indian Ocean by Thai Fleet during 2010-2012









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    Billfish fishery of Thailand 2013
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    Thai tu longline that composed of 3 tu longlines in 2007 and 2 tu longliners during 2008-2012. The main fishing ground was central and southern part of the Indian Ocean. This report was based on the data extracted from fishing longsheets which were delivered to Department of Fisheries, Thailand During 2007-2012, is summarized and calculated the hook rate in Catch Per Unit Effort (CPUE). The fishing operations were recorded 2,276 fishing days. The highest total catch was in 2010 with 607.69 tonne s followed by 2012, 2007, 2011, 2009 and 2008, respectively (494.95,461.64, 370.39, 295.23 and 265.57 tonnes). The highest CPUE was found in 2010 with 13.62 fish/1,000 hooks followed by 2012 and 2007, respectively (10.80 and 10.20 fish/1,000 hooks). The major catch species wer bigeye tu (Thunnus obesus) , yellowfin tu (T. albacores) Albacore tu (T. alalunga), swordfish and shark. In 2012, the numbers of individual billfish were 736 individual fishes with 25.05 tonnes. The highest total catch of Billfish was in 2010 with 80.58 tonnes followed by 2008, 2009, 2012, 2011 and 2007, respectively (59.35, 54.63, 25.05, 16.00 and 8.23 tonnes) The highest CPUE was found in 2008 and 2010 with 1.0 fish/1000 hooks.
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    National Report – Thailand 2013
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    Neritic tu species in the Andaman Sea Coast, Thailand comprise 7 species (Thunnus tonggol, Euthynnus affinis, Auxis thazard, A. rochie, Katsuwonus pelamis and Sarda orientalis, Scomberomorus spp.). These species were caught from purse seine, king mackerel gill net and trawl, while purse seine was the main fishing gear. The trend of neritic tu catches have been decreasing from 45,083 tons in 1997 to 13,093 tons in 1999. The production was quite stable around 10,711 and increase to 11,861 in 2009. These neritic tu species are more or less have its production trend similarity. Three Thai tu longliners were operated in the Indian Ocean in 2007 and in 2008- 2012 only two Thai tu longliners kept on fishing there. Fishing grounds were mainly in the western coast of Indian Ocean. The fishing operations were recorded 2,276 fishing days. The highest total catch was in 2010 with 607.69 tonnes followed by 2012, 2007, 2011, 2009 and 2008, respectively (494.95,461.64, 370.39, 295.23 and 265.57 tonne s). The highest CPUE was found in 2010 with 13.62 fish/1,000 hooks followed by 2012 and 2007, respectively (10.80 and 10.20 fish/1,000 hooks). The major catch species wer bigeye tu (Thunnus obesus) , yellowfin tu (T. albacores) Albacore tu (T. alalunga),swordfish and shark.
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    Sharks: Bycatch in the tuna longline fishery in the Indian Ocean by Thai tuna longliners in 2012 2013
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    This report was based on the data extracted from fishing logsheets by two Thai tu longliners mely, “Mook Andaman 018” and “Mook Andaman 028”, which declared to Department of Fisheries, Thailand. Data from their logsheets displayed important information of their fishing operation and effort. In 2012, fishing grounds were mainly in the Western coast of Indian Ocean. The total catches were 470.40 tons with 387 days of fishing effort. The average catch rate of total catch was 10.83 individual fish/1 ,000 hooks. The major catch species were bigeye tu (Thunnus obesus), yellowfin tu (T. albacares), swordfish and shark. Sharks are present as an important role in the ocean ecosystem. The fishing operation was reduced their population. Among the bycatch of tu longline fishery, The percentage of sharks to the total catch is 4.64% by weight and 3.94% by number. Numbers of shark were 544 individual fishes with 18,528 kg. The catch rate was 0.5 individual fish/1,000 hooks, 17.10 kg/1,000 hooks. Catch data of sharks are classed into a single group of “sharks”, due to species unidentification.

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