The potential use of scales for estimating age and growth of Mediterranean albacore (Thunnus alalunga)
The potential use of scales for estimating age and growth of Mediterranean albacore (Thunnus alalunga)
复制标题
使用尺度来估计地中海长鳍金枪鱼（Thunnus alalunga）年龄和生长的潜在用途
DOI：
10.1046/j.1439-0426.2003.00450.x
复制
发表时间：
2003
影响因子：
0.9
通讯作者：
J. Dean
中科院分区：
文献类型：
--
作者：
P. Megalofonou;C. Yannopoulos;J. Dean
准确估计鱼龄的能力对于进行种群评估和制定渔业管理政策至关重要。从1989-1995年在地中海捕获的长鳍金枪鱼（Thunnus alalunga）中采集鳞片，以估计其年龄和生长。年龄范围从1+到6+年，估计从473个人的尺度上的同心环的解释，叉长度从55.5到89厘米不等。男性的体型和年龄都比女性大。通过比例尺和其他技术估计的年龄平均长度的相对接近的协议构成了该方法的初步验证。将von Bertalanffy生长模型拟合为估计年龄的平均长度，得到以下组合性别的生长参数：L¥ 86 cm，K ¥ 0.4至1/4）0.8岁。参数估计值与已知的地中海物种的生活史一致。此外，增长率是一致的长度增量观测从五个标签回报，这支持我们的工作假设，即规模环是年度结构。当地中海长鳍金枪鱼的生长参数与大西洋长鳍金枪鱼的规模年龄估计相比，有显着差异，两个人口之间，地中海长鳍金枪鱼仍然显着小于大西洋长鳍金枪鱼。
Summary The ability to accurately estimate the age of fishes is critical for conducting stock assessments and developing fishery management policies. Scales were collected from albacore, Thunnus alalunga, caught in the Mediterranean Sea during the years 1989–1995 to estimate their age and growth. Ages, which ranged from 1+ to 6+ years, were estimated from the interpretation of the concentric rings on the scales of 473 individuals that ranged in fork length from 55.5 to 89 cm. Males reached a greater size and age than females. The relatively close agreement in the mean lengths at ages estimated by scales and other techniques constituted a preliminary verification of the method. The von Bertalanffy growth model was fitted to mean lengths at estimated ages, resulting in the following growth parameters for the combined sexes: L¥ ¼ 86 cm, K ¼ 0.4, to ¼ )0.8 years. Parameter estimates were in agreement with what is known about life history of the species in the Mediterranean. Moreover, the growth rates were consistent with length increment observations from five tag returns, which lend support to our working hypothesis that the scale-rings are annual structures. When the Mediterranean albacore growth parameters were compared with those of Atlantic Ocean albacore using scale age estimates, there were significant differences between the two populations, and Mediterranean albacore remain significantly smaller than Atlantic Ocean albacore.