LAJU PERTUMBUHAN, LAJU KEMATIAN DAN EKSPLOITASI IKAN TONGKOL KOMO, Euthynnus affinis (Cantor 1849), DI PERAIRAN SAMUDERA HINDIA BARAT SUMATERA

Abstract

Tongkol komo (Euthynnus affinis Cantor, 1849)merupakan hasil tangkapan utama bagi nelayan pukat cincin di Samudera Hindia sebelah barat Sumatera. Penelitian ditujukan untukmemperoleh data dan informasi tentang estimasi laju pertumbuhan, laju kematian dan laju eksploitasi ikan tongkol komo. Analisis dilakukan berdasarkan himpunan data frekuensi panjang cagak sebanyak 1.325 ekor hasil tangkapan pukat cincin yang didaratkan di Pelabuhan Sibolga. Contoh ikan dikumpulkan secara bulanan dari bulan Juli 2012 hingga Februari 2013. Pendugaan parameter dilakukan menggunakan program FISAT II (FAO-ICLARM Stock Assessment Tools). Hasil kajian menunjukkan kisaran panjang cagak antara 30 - 60 cm, panjang asimptotik (L∞)= 63,5 cm, laju pertumbuhan(K) = 0,63/tahun dan umur teoritis pada saat panjang ke 0 ( t0 ) = -0,21 tahun. Estimasi laju kematian total tahunan (Z) sebesar 2,40/tahun, laju kematian alami (M) sebesar 1,07/tahun dan laju kematian akibat penangkapan(F) sebesar 1,33/tahun. Perkiraan Laju eksploitasi (E) = 0,55 mengindikasikan bahwa tingkat pemanfaatan berada pada tingkat yang moderat.Kawakawa (Euthynnus affinis Cantor, 1849) is the one of the major catch of fishermen in the Indian Ocean west off Sumatera. This study was aimed to investigate data and information on growth, mortality and the exploitation rates of kawakawa. Analyses were carried out based on a number of 1,325 length frequency data from purse seine fishery landed in Sibolga Fishing Port. Monthly base data were collected from July 2012 to February 2013. The specimens ranged from 30 to 60 cm FL. parameters were determined through a packageprogramof FISAT II (FAO-ICLARM StockAssessment Tools). The result showed that asymptotic length (L∞) were 63.5 cmFL, growth rates (K) 0.63/yr and estimated t0 -0.21 years. The annual instantaneous rate of total mortality (Z) was 2.40/yr, the natural mortality (M) was 1.07/yr and the fishing mortality (F) was 1.33/yr. The exploitation rate (E = 0.55) indicated that E. affinis was moderately exploited in the area

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