The narrow-barred Spainsh mackerel (Scomberomores commerson) is one of the major commercial fish species in waters of Taiwan. The relationships between body weight and fork length for S. commerson BW= 0.00000006FL2.962 (r² = 0.95555, n=1082).
Whole otoliths from females 268, and males 237 respectively, were examined. The oldest females was 9 years old (159 cm FL, 27 kg), and males was 5 years old (137 cm FL, 17.8 kg), respectively. The growth Von Bertalanffy growth parameters show that females S. commerson ( L∞ =148.08, K=0.358, to =-0.925years ) grew at a fast rate but reached a greater asymptotic length than males fish (L∞ =145.71, K=0.268, to =- 1.612).
The three S. commerson (ranging from 92 to 111 cm in fork length) were tagged and released. The fish were tracked to provide information on depth and temperature preferences as well as horizontal movements. The vertical movement maximum depth was 84.9 m during the daytime and 79.0 m at nighttime. The mean swimming depth was 28.8 m (±18.9 m) during the daytime and 26.03 m (±17.01 m) at nighttime, which was a contrast to the findings in the waters. The majority of the Daytime vertical movements (13%) were in the 5 m depth range, with the 10% in 20 m depth. Nighttime movements were in less than 50 m depth waters, and individual layers is relatively even in 5~13%. The most of its horizontal movements (90.0%) occurring at temperatures that ranged from 25 to 27 °C, suggesting that S . commerson have a preference for this temperature range throughout the period of PAST observation.