Institute of Oceanography, College of Science, National Taiwan University, Taipei 10617, Taiwan, R.O.C.
J Fish Biol. 2012 May;80(6):2328-44. doi: 10.1111/j.1095-8649.2012.03292.x.
The age and growth of North Pacific albacore Thunnus alalunga were investigated using obliquely sectioned sagittal otoliths from samples of 126 females and 148 males. Otolith edge analysis indicated that the identified annulus in a sagittal otolith is primarily formed during the period from September to February. The assessments of the fish age at first annulus formation indicated that the first annulus represents an age of <1 year. This study presents an age estimate (0·75 years) for the formation of the first annulus. The oldest fish ages observed in this study were 10 years for females and 14 years for males. The von Bertalanffy growth parameters of females estimated were L(∞) = 103·5 cm in fork length (L(F) ), K = 0·340 year(-1) and t(0) = -0·53 years, and the parameters of males were L(∞) = 114·0 cm, K = 0·253 year(-1) and t(0) = -1·01 years. Sexual size dimorphism between males and females seemed to occur after reaching sexual maturity. The coefficients of the power function for expressing the L(F) -mass relationship obtained from sex-pooled data were a = 2·964 × 10(-5) and b = 2·928.
本研究采用斜切矢耳石对 126 尾雌鱼和 148 尾雄鱼样本进行分析，研究了北太平洋大目金枪鱼的年龄和生长情况。耳石边缘分析表明，矢耳石中识别出的轮纹主要形成于 9 月至 2 月期间。对首次形成轮纹的鱼类年龄的评估表明，第一个轮纹代表小于 1 岁的年龄。本研究提出了首次形成轮纹的年龄估计值（0.75 岁）。本研究观察到的最老鱼龄为雌鱼 10 龄，雄鱼 14 龄。雌性的 von Bertalanffy 生长参数估计值为 L（∞）= 103.5 厘米（叉长 L（F）），K = 0.340 年（-1），t（0）= -0.53 年，雄性的参数为 L（∞）= 114.0 厘米，K = 0.253 年（-1），t（0）= -1.01 年。雌雄鱼之间的性二型似乎在达到性成熟后发生。从雌雄混合数据中得出的 L（F）-质量关系的幂函数系数为 a = 2.964×10（-5）和 b = 2.928。
