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首页> 外文期刊>Journal of Fish Biology >Development stage distribution as a proxy for feeding success and growth for first feeding Norwegian spring spawning herring larvae
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Development stage distribution as a proxy for feeding success and growth for first feeding Norwegian spring spawning herring larvae

机译：发展阶段分配作为喂养成功和增长的代理，以便首次喂养挪威春天产卵鲱鱼幼虫

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摘要

The estimation of growth rates in young herring larvae (Clupea harengus) in the field can be difficult because the primary increments in the otoliths may not be discernible or formed at a daily level. Likewise, the estimation of mortality rates of fish larvae in the field is very difficult to achieve, especially in a rigorous quantitative manner. In this study, the authors suggest the use of a stage-based proxy of feeding success, growth and potential survival or mortality risk of field-caught larvae. The stage-based proxy is derived based on observations from previous laboratory studies where larvae successfully completing start-feeding on external food sources will advance through the early development stages, whereas those that do not (unsuccessful larvae) remain and accumulate in the development stage preceding first feeding. The relative occurrence of larvae in the early development stages is therefore expected to reflect feeding conditions of the larvae, with higher ratios of unsuccessful larvae indicative of poor feeding success and higher mortality risk. Using field data on Norwegian spring spawning herring, the authors document that the relative occurrence of larvae in the late non-feeding stage is significantly higher at lower average zooplankton concentrations, in line with the predictions of the authors that this novel approach of using a stage-based proxy could be a useful indication of feeding success, growth and mortality in the field. Further, there was a significant interaction effect with ambient temperature, with the ratio being higher at low zooplankton concentrations at higher temperatures. This study also suggests that these findings are not population specific as the same accumulation of non-feeding larvae in the late non-feeding stage was observed in laboratory-reared larvae of both autumn and spring spawning herring populations.
机译：由于耳石中的主要增量可能无法识别或在日常水平上无法形成，因此很难在野外估计青鱼幼体（Clupea harengus）的生长速率。同样，估计现场的鱼苗死亡率非常困难，尤其是以严格的定量方式。在这项研究中，作者建议使用一种基于阶段的指标来衡量现场捕获的幼虫的喂养成功率、生长和潜在存活或死亡风险。基于阶段的替代物是根据之前实验室研究的观察得出的，在这些研究中，成功完成开始进食外部食物来源的幼虫将在早期发育阶段提前，而那些没有成功完成进食的幼虫（不成功的幼虫）则会在第一次进食之前的发育阶段继续存在并积累。因此，幼虫在早期发育阶段的相对发生率预计将反映幼虫的摄食条件，不成功的幼虫比例较高，表明摄食成功率较低，死亡率较高。利用挪威春季产卵鲱鱼的现场数据，作者证明，在较低的平均浮游动物浓度下，非摄食后期幼虫的相对发生率显著较高，这与作者的预测一致，即使用基于阶段的代理的这种新方法可能是现场摄食成功、生长和死亡率的有用指示。此外，与环境温度存在显著的相互作用效应，在较低的浮游动物浓度和较高的温度下，这一比例更高。这项研究还表明，这些发现并不是群体特异性的，因为在秋季和春季产卵鲱鱼群体的实验室饲养的幼虫中，在非摄食后期观察到相同的非摄食幼虫积累。

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