Growth Analysis in Artificially Hatched Pacific Bluefin Tuna Thunnus orientalis

抄録

Growth of artificially hatched and cultured Pacific bluefin tuna (PBT) Thunnus orientalis, was examined for individuals of 2.2 yr-old or older and less than 5.5 yr-old. Fitted von Bertalanffy growth curves of standard length (SL), body weight (BW), body mass index (BMI) was not significantly different among sexes (P>0.05). Growth rates of SL and BW showed a seasonal fluctuation that was synchronous with the seawater temperature seasonal fluctuation, especially at the younger age, at the farming site. This indicates strong temperature dependence of growth of the PBT at the younger age and no gender difference in growth during the immature stage.