Preliminary Age and Growth of Bigeye Tuna, Thunnus obesus (Lowe, 1839) from the Northeastern Indian Ocean

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Praulai Nootmorn
Sansanee Srichanngarm
Sampan Panjarat
Shettapong Meksumpun
Thon Thamrongnawasawat
Tuantong Jutagate

Abstract

The present study provides preliminary information on age and growth for bigeye tuna, Thunnus obesus (Lowe, 1839) caught in the northeastern Indian Ocean. Two hundred and ten (210) individuals (size range: 41.0–188.5 cm fork length, FL) were collected from Phuket port, Thailand. High correlations were found (r>0.95) among head length, length to first dorsal fin and fork length. Age determined in 69 fish (size range: 41.0 to 137.1 cm FL) ranged between 133 and 1,530 days. Length and age data were fitted to the von Bertalanffy, Logistic and Gompertz growth models. The lowest sum of squares was obtained from the Logistic model, for which the asymptotic length was 180.49 cm FL, growth coefficient was 0.72 year-1, and theoretical age at size equal to zero was 1.95 years. These findings serve as a baseline for further use in assessment of the status of bigeye tuna stocks in the Indian Ocean.

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