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Billfish fishery of Thailand









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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 caught by Malagasy longline in 2012 2013
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    Madagascar started exploring longline fishery in 2007 by shifting from trawl gear to small longliners. The number of vessels, targeting tu and tu-like species in the IOTC area of competence, has been increasing. In 2012, Malagasy flag deployed 8 longliners less than 24 m off the east coast (Annexe1). Note that some of them are multigear, wherebery fishing vessels may target demersal resources and at othertimes they may target tu and tu-like species. The following results were obtained from the M alagasy observer program database and from pelagic species companies’ declarations. The trend of total declared catches decreased throughout recent years and ranged from 497 tons to 388 tons in 2010 and 2012, respectively. The decline of catches is due to the reduction of number of big vessels. Indeed, a significant declining trend in percentage of shark landings (from 17% to 13%) was observed over the period. This paper figured out that monthly effort ranged from 14,000 hooks deployed in April to 49,447 hooks deployed in October. Total catch was 388,361 tons which was composed of 44.66% tu, 25.38% billfishes, 13.24% sharks and 16.72% of others species. Sharks landed were composed mainly of mako shark (92.42%) and blue shark (6.84%) and their CPUEs’ were 143.5 Kg/1,000 hooks and 13.6 Kg/1,000 hooks, respectively. Two specimens of shortfin mako ranged from 212 to 258 cm FL were identified by observers on board. In the same way, 37 specimens of Blue shark ranged from 164 cm to 352 cm FL. This study showed some biological information of all observed species such as length, weight, sex, GSI maturity. Observers reported that Malagasy longliners still caught IOTC prohibited species such as bigeye thresher and thresher.
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    Tuna Longline Fishery in the Indian Ocean by Thai Fleet during 2010-2012 2013
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    Thai tu longline fishery were operated in the Indian Ocean during 2010 - 2012 composed of 2 tu longliners. The main fishing ground was located in the western part of the Indian Ocean. In 2010-2011 fishing ground was located cover the central and the western part of the ocean whereas in 2012 the fishing ground was located mostly in the central part of the Western Indian Ocean. The data of tu fishery was collected from Thai longliner logbooks. The fishing operations targeted on tropical tu species , bigeye tu and yellowfin tu. During 2010-2012, the fishing operation amount 1,232 days or 3,449,600 hooks were recorded. The highest catch of these species was in 2012, followed by 2011 and 2010, respectively. A total of bigeye tu and yellowfin tu composition during 2010-2012 was 61.33% by number and 71.01% by weight of total catch. The highest CPUE of total catch was found in 2012, followed by 2011 and 2010, respectively.

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