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Neritic tunas and seerfishes in the Andaman Sea of Thailand are caught by small-scale purse seiners. There are four species of neritic tuna, i.e., longtail tuna (Thunnus tonggol), Kawakawa (Euthynnus affinis), frigate tuna (Auxis thazard) and bullet tuna (A. rochei), and two species of seerfish, i.e., narrow-barred Spanish mackerel (S. commerson) and Indo-Pacific king mackerel (Scomberomorus guttatus) caught by the purse seiners. The neritic tuna and seerfish catch data are annually submitted to the IOTC secretariat. However, there are some major discrepancies between the species composition of the annual retained catches (reported through form 1RC) and the geo-referenced catches (reported through form 3AR). In addition, there are some species aggregates that were reported in the geo-referenced catches, e.g., species code AG06, standing for a mix of Kawakawa, frigate, and bullet tuna and a mix of narrow-barred Spanish mackerel and Indo-Pacific king mackerel. This paper aims to reconstruct the species composition of neritic tuna and seerfish by using monthly port sampling information. The mixed neritic tuna and seerfish catches were disaggregated back to 2006 by month while the total catches remained the same as previously reported. The form 1RC and form 3AR were corrected and will be submitted to the IOTC secretary.
