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A comparative analysis of European eel’s somatic growth in the coastal lagoon Santo André (Portugal) with growth in other estuaries and freshwater habitats
Environmental Biology of Fishes ( IF 1.4 ) Pub Date : 2021-07-15 , DOI: 10.1007/s10641-021-01123-6
Maria João Correia 1 , Isabel Domingos 1, 2 , José Lino Costa 1, 2 , Giulio A. De Leo 3
Affiliation  

Age and growth of European eel (Anguilla anguilla) from a coastal lagoon in southwestern Europe were investigated using a sample of 871 eels. Fish were caught with fyke nets in two fishing seasons, 2011/12 and 2015/16. Age was determined by reading sagittal otoliths and age estimates were validated through semi-direct methods. The yellow and silver eels ranged in length from 174 to 904 mm corresponding to an age range of 2–9 years for females and 2–6 years for males. Length-at-age was estimated through back-calculation using the measurements taken in otoliths and a common biological intercept. The von Bertalanffy growth equation fitted to the back-calculated lengths is \({L}_{t}(\mathrm{mm})= 673.5\left[1-{e}^{-0.45 \left(t - 0.17\right)}\right]\) for females, and \({L}_{t}(\mathrm{mm})= 338.1 [1-{e}^{-1.23 \left(t - 0.15\right)}]\) for males. The growth rate of the eel population in Santo André lagoon is high and the males show an early onset of maturity. The mean length of males at silvering is almost half the size of silvering females. Comparison with eel somatic growth from 17 other geographical locations revealed that the eel growth in Santo André lagoon is among the fastest reported for the species. A principal component analysis showed a gradient in somatic growth ranging from fast-growing eels in coastal lagoons (larger K, early maturity, smaller asymptotic size Linf) to slow-growing eels in freshwaters (smaller K, late maturity, larger Linf).



中文翻译:

欧洲鳗鱼在沿海泻湖圣安德烈(葡萄牙)的体细胞生长与其他河口和淡水栖息地生长的比较分析

使用 871 条鳗鱼样本研究了来自欧洲西南部沿海泻湖的欧洲鳗鱼 ( Anguilla anguilla ) 的年龄和生长情况。在 2011/12 和 2015/16 两个捕鱼季节,使用 fyke 网捕获了鱼。通过读取矢状耳石确定年龄,并通过半直接方法验证年龄估计。黄色和银色鳗鱼的长度从 174 到 904 毫米不等,对应于雌性 2-9 岁和雄性 2-6 岁的年龄范围。年龄长度是通过使用耳石中的测量值和常见的生物截距进行反算来估计的。拟合到反向计算长度的 von Bertalanffy 增长方程为\({L}_{t}(\mathrm{mm})= 673.5\left[1-{e}^{-0.45 \left(t - 0.17\ right)}\right]\)对于女性,以及\({L}_{t}(\mathrm{mm})= 338.1 [1-{e}^{-1.23 \left(t - 0.15\right)}]\)男性。圣安德烈泻湖的鳗鱼种群增长率很高,雄性成熟较早。镀银时雄性的平均长度几乎是镀银雌性的一半。与来自其他 17 个地理位置的鳗鱼体细胞生长的比较显示,圣安德烈泻湖的鳗鱼生长是该物种报告的最快的。主成分分析显示,从沿海泻湖中快速生长的鳗鱼(较大的K,早熟,较小的渐近尺寸L inf)到淡水中生长缓慢的鳗鱼(较小的K,晚熟,较大的L inf),体细胞生长呈梯度变化.

更新日期:2021-07-15
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