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MeetingA review on oceanic tuna fishery in Sri Lanka and estimation of the length-weight relationships for yellowfin tuna and bigeye tuna 2013
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No results found.There are three domint oceanic tu species frequently found in Sri Lankan waters mely yellowfin tu (Thunnus albacares), bigeye tu (Thunnus obesus) and skipjack tu (Katsuwonus pelamis). This paper reviews the trends of oceanic tu landings in Sri Lanka. Also, attempt was made to estimate the length weight relationships of two major species: yellowfin tu (Thunnus albacares) and big eye tu (Thunnus obesus). The annual production of oceanic tu has increased rapidly over the period 1950-2010 and the hi ghest production was reported in 2004. Skipjack tu was the major contributor throughout the period followed by yellowfin tu. Oceanic tu resources are frequently targeted by offshore fishing crafts of three categories: UN3A (9.8 - 12.2 m in length), UN3B (12.2-15.2m) and UN4 (15.2-18.3m). Gillnet has effectively been contributing for catching oceanic tu. The estimated length -weight relationships for yellowfin tu (Thunnus albacares) and bigeye tu (Thunnus obesus) were W= 0.033L2.848 and W=0.011L3 .08 respectively.
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