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National Report – Thailand







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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 – Australia 2013
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    Pelagic longline and purse seine are the two main fishing methods used by Australian vessels to target tu and billfish in the Indian Ocean Tu Commission (IOTC) Area of Competence. In 2012, three Australian longliners from the Western Tu and Billfish Fishery and one longliner from the Eastern Tu and Billfish Fishery operated in the IOTC Area of Competence. They caught 13.1 t of albacore (Thunnus alalunga), 167.4 t of bigeye tu (Thunnus obesus), 23.0 t of yellowfin tu (Thunnus albacares), 209.3 t of swordfish (Xiphius gladius) and 2.5 t of striped marlin (Tetrapturus audax). These catches represent approximately 13 per cent of the peak catches taken by Australian vessels fishing in the IOTC Area of Competence in 2001, for these five species combined. In addition, Australian vessels using minor line methods took a small amount of catch. The number of active longliners and levels of fishing effort have declined substantially in recent years due to reduced profitability, primarily as a resu lt of lower fish prices and higher operating costs. The catch of southern bluefin tu (Thunnus maccoyii) in the purse seine fishery was 4503 t in 2012. A small amount of skipjack tu (Katsuwonus pelamis) was caught by purse seine fishing in 2012 (0.2 t). In 2012, less than 1 t of shark was landed by the Australian longline fleet operating in the IOTC Area of Competence and 11 371 sharks were discarded/released. In 2012, 17.8 per cent of all hooks set in WTBF longline operations were observed over three trips in the IOTC Area of Competence.
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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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