The research was conducted at the Tuna Fisheries Research Station, Denpasar, Bali in July 2018. There was several types of high-value fish including tuna, skipjack, shrimp, cob, mackerel, snapper, squid, reef fish (grouper, baronang, lobster / barong shrimp), ornamental fish and assault including seaweed. Benoa Fishing Port is one of the tuna landing base bases in Indonesia which is the main port in Bali Province besides Muara Baru (Jakarta), Pelabuhan Ratu (West Java) and Cilacap (Central Java). This research aim to identified length-weigt relationship, and proportion of proper catch size of big eye tuna. Identification of bigeye tuna (Thunnus obesus) identified by visually analize. The first is seen is the size of the eye that tends to be large. The growth pattern of big eye tuna (Thunnus obesus) landed in Benoa Fishing Portis isometric where length increase is equal to weight gain (isometric positive). The length distribution of big eye tuna in range of 81-170 cm FL (334 fishes are obtained), and the distribution of weights in size of 11-95 kg with the most caught size which is in the range of 16-20 kg (95 fishes). The catch of big eye tuna in July 2018 for 3 weeks of data collection at Benoa Fishing Port, 60% of the fish have not reached the proper catch size.
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 Blackwell, B.G., Brown, M.L & Willis, D.W. 2000. Relative weight (Wr) status and current use in fisheries assessment and management. Reviews in Fisheries Science 8: 1-44.
 Bojolly, D., Doyen, P., Le Fur, B., Christaki, U., Verrez-Bagnis, V. and Grard, T., 2017. Development of a qPCR Method for the Identification and Quantification of Two Closely Related Tuna Species Bigeye Tuna (Thunnus obesus) and Yellowfin Tuna (Thunnus albacares), in Canned Tuna. Journal of agricultural and food chemistry, 65(4), pp. 913-920.
Financed by the National Centre for Research and Development under grant No. SP/I/1/77065/10 by the strategic scientific research and experimental development program:
SYNAT - “Interdisciplinary System for Interactive Scientific and Scientific-Technical Information”.