ABSTRAK
Ikan tuna mata besar (Thunnus obesus LOWE, 1839) merupakan ikanpelagis besar yang mempunyai nilai ekonomis yang sangat penting sebagaihasil tangkapan kapal rawai tuna di Pelabuhan Benoa, Bali. Hasil tangkapantuna mata besar yang didaratkan di Pelabuhan Benoa, Bali mengalamipenurunan. Penelitian ini bertujuan untuk memperoleh informasi tentangaspek biologi dan mengestimasi status pengelolaan sumberdaya tuna matabesar hasil tangkapan rawai tuna di Pelabuhan Benoa, Bali.Metodepenelitian yang dilakukan meliputi pengukuran aspek biologi, CPUE danMSY. Berdasarkan analisa aspek biologi diduga bahwa ikan tuna mata besaryang ditangkap pada bulan April-Mei telah melewati masa pijah, polapertumbuhan ikan tuna mata besar bersifat isometrik yang berartipetumbuhan panjang sama dengan pertumbuhan berat. Hubungan antaraupaya penangkapan dan CPUE menunjukkan bahwa nilai CPUE naik apabilaterjadi penambahan alat tangkap. Berdasarkan Single Quantitative Modellingmethod (ASPM) diperkirakan nilai MSY ikan tuna mata besar adalah103.000 ton. Jumlah rata-rata tangkapan pada tahun 2007-2011 sebesar101.639 ton. Nilai tersebut masih dibawah nilai MSY yang berarti belumterjadi tangkap lebih ikan tuna mata besar.

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ABSTRACT
Bigeye tuna, Thunnus obesus, is the most commercially economicimportant pelagic fish resources which is the main target of the pelagiclongline fisheries landing at Benoa Fishing Port in Bali Province. However,the production of bigeye tuna at Benoa Fishing Port has shown the decliningtrend in the past years. The objectives of this research are to get someinformation on biological aspects and to estimate the status of big eye tunamanagement which was landed at Benoa Fishing Port. The methodologyincludes the measurement of biological aspects. Bigeye tunas were caughtin April-May has passed the spawning time. The growth patterns of thebigeye tuna are isometric, which means that the increasing length was thesame with weight. Based on the Single Quantitative Modeling methology(ASPM) MSY bigeye tuna was estimated at 103.000 tons. Average numberof catches in 2007-2011 was 101.639 tons. As this value is still below theaverage value of MSY, so it can be concluded that the overfishing of bigeyetuna has yet occured.