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Discrimination of Trisopterus luscus stocks in northern Portugal using otolith elemental fingerprints

机译：使用耳石元素指纹识别葡萄牙北部的毛s属种群

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The pout, Trisopterus luscus, is one of the most important gadoid fish captured by northern Portuguese traditional fisheries. In spite of a substantial decrease in fish catches, little data are available either on the population structure or on the management of the species. In this study, chemical analysis with inductively coupled plasma mass spectrometry of whole otoliths of 90 pouts (age group 2, total length: 17.9-25.0 cm) provided location-specific elemental signatures. Sampling took place in shallow waters along the coastline in three fishing grounds off the Portuguese north coast (Viana do Castelo, Matosinhos and Aveiro) between February and March 2010. Otolith fingerprint analysis detected the presence of several informative trace elements. Molar concentrations for each site were analysed through uni-and multivariate statistical tests. Strontium, barium, magnesium and lithium (Sr, Ba, Mg and Li) differed significantly among locations, while no significant differences were found for manganese (Mn) and nickel (Ni). Canonical analysis allowed us to discriminate the tested individuals with respect to their sampling origin with a mean classification accuracy of 69%. The observed site-specific elemental differences in pout otoliths suggest a high level of site-fidelity in relation to their growing/feeding areas. Pouts from these locations can be regarded as a single, although not necessary homogenous, stock. Furthermore, this study also suggests that the populations of juvenile fish mix partially and, therefore, cannot be assumed to be separate units for fisheries management purposes.
机译：s嘴Trisopterus luscus是葡萄牙北部传统渔业捕捞的最重要的角质鱼类之一。尽管渔获量大大减少，但是关于种群结构或物种管理的数据很少。在这项研究中，使用电感耦合等离子体质谱仪对90 out嘴的整个耳石进行化学分析（年龄组2，总长度：17.9-25.0 cm）提供了特定位置的元素特征。在2010年2月至3月之间，在葡萄牙北部海岸外的三个渔场（维亚纳堡，马托西纽什和阿威罗）的沿海沿岸浅水区进行了采样。Otolith指纹分析检测到了一些有用的痕量元素。通过单变量和多变量统计检验分析了每个部位的摩尔浓度。锶，钡，镁和锂（Sr，Ba，Mg和Li）的位置之间存在显着差异，而锰（Mn）和镍（Ni）则没有显着差异。规范分析使我们能够根据样本来源来区分被测个体，其平均分类精度为69％。在p嘴耳石中观察到的特定于位点的元素差异表明，相对于它们的生长/饲喂面积，其位点保真度很高。来自这些位置的out鱼可被视为单一的种群，尽管不一定是同质的种群。此外，这项研究还表明，幼鱼种群部分混合，因此，出于渔业管理目的，不能假定它们是单独的单位。

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