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Apreliminary study on species composition of aKorean purse seine catch landed at cannery was conducted inApril2011. In the cannery, alltuna catch are sliding through asorting grid panelthatfilters and drops fish in thebuckets by size class (above 9kg, 3.49kg, 1.83.4kg, 1.41.8kg and below 1.4kg). In cannery processing,species sorting was made for skipjack tuna and yellowfin tuna only from catches greater than 3.4kg duringfiltering butnotfor bigeye tuna because of difficulties in species identification between bigeye tuna and yellowfintuna under frozen state. As no species identification was carried outfor catch groups less than 3.4kg in the canneryprocess, this study focused on sorting outskipjack tuna and yellowfin tuna from these groups and then identifyingbigeye tuna from all size groups of yellowfin tuna. Using the mixture rate of species obtained from the samplestaken, species composition of the landed catch was estimated. As results, cannery research showed 95% forskipjack tuna, 3% for yellowfin tuna and 2% for bigeye tuna in species composition, while vessel logbook datarepresented 96%, 3% and 1% for skipjack tuna, yellowfin tuna and bigeye tuna, respectively. The proportion ofbigeye tuna identified in the cannery was slightly higher than shown in logbook data by 1%.Keywords: Purse seine catch, Species composition, Mixture rate, Skipjack tuna, Yellowfin tuna, Bigeye tuna

Pilot research on species composition of Korean purse seine catch at cannery