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Individual variations in fatty acid composition and concentration as indicators of the nutritional condition of wild pointhead flounder larvae

机译：脂肪酸组成和浓度的个体差异作为野生尖头比目鱼幼虫营养状况的指标

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摘要

We investigated the fatty acid compositions and concentrations of wild marine fish larvae with a highly accurate method because our knowledge of them has been seriously limited compared with cultured larvae. This study presents estimates of the fatty-acid-based nutritional condition of individual larvae in the field. Because the pointhead flounder Cleisthenes pinetorum displays relatively high stock size fluctuations, we investigated the developmental change in the fatty acid compositions of the body trunk, head, and eye and the annual fluctuations in the fatty acid concentrations in the trunk. We show that the process of fatty acid accumulation is not uniform across body parts and that the trunk is a better indicator of larval nutritional status than other parts because there is less time lag. Starved larvae with simultaneously high docosahexaenomic acid ratios and low total fatty acid concentrations, as observed in laboratory experiments, are rare in the wild. Thus, starved larvae must be removed rapidly by predators before they can experience a relatively long period of starvation in the wild. Fatty acid accumulation was greater in the larvae of the 2005 year class than in those of the 2006 year class in their first feeding stage, according to the optimal model derived with generalized linear model. A previous study indicated that the 2005 year class showed stronger recruitment than the 2006 year class. We conclude that the fatty acid analysis of wild larvae is a useful index of their nutritional status and mortality, especially in the first feeding stage.
机译：我们使用高度精确的方法调查了野生海鱼幼虫的脂肪酸组成和浓度，因为与养殖幼虫相比，我们对它们的了解受到严重限制。这项研究提出了在田间个体幼虫的脂肪酸为基础的营养状况的估计。因为尖头比目鱼Cleisthenes pinetorum显示出相对较高的种群大小波动，所以我们调查了身体躯干，头部和眼睛的脂肪酸组成的发育变化以及躯干中脂肪酸浓度的年度波动。我们表明，脂肪酸积累的过程在身体各部位之间并不均匀，并且与其他部位相比，躯干是幼虫营养状况的更好指标，因为时滞更短。在实验室实验中观察到，同时具有高二十二碳六烯酸比率和低总脂肪酸浓度的饥饿幼虫在野外很少见。因此，饥饿的幼虫必须先被捕食者迅速清除，然后才能在野外经历相对较长的饥饿时间。根据广义线性模型推导的最佳模型，在其第一个喂养阶段，2005年级幼虫中的脂肪酸累积量高于2006年级幼虫中的脂肪酸累积量。先前的研究表明，2005年班级的招生比2006年班级的招生要强。我们得出的结论是，野生幼虫的脂肪酸分析是其营养状况和死亡率的有用指标，尤其是在第一个喂养阶段。

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  • 来源
    《Marine biology》 |2014年第7期|1615-1625|共11页
  • 作者

    Yuko Hiraoka; Tetsuya Takatsu; Yasuhiro Ando;

  • 作者单位

    National Research Institute of Far Seas Fisheries, Orido, Shimizu, Shizuoka 424-8633, Japan;

    Faculty of Fisheries Sciences, Hokkaido University, Minato, Hakodate, Hokkaido 041-8611, Japan;

    Faculty of Fisheries Sciences, Hokkaido University, Minato, Hakodate, Hokkaido 041-8611, Japan;

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