The use of fatty acid markers to distinguish hatchery and wild chum salmon fry and a description of post-stocking changes in fatty acid levels

IF 2.3 2区农林科学 Q2 FISHERIES

Fisheries Research Pub Date : 2025-09-20 DOI:10.1016/j.fishres.2025.107537

Yutaka Yano, Koh Hasegawa, Kentaro Honda, Yuhei Ogura

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Abstract

Fatty acid compositions of chum salmon (Oncorhynchus keta) fry were examined to distinguish between hatchery and wild fish in natural environments. Levels (%) of 18:2n-6 (linoleic acid) were significantly higher in fry obtained from a hatchery (13.0 %) than in wild fry collected in a river (2.1 %). Conversely, levels of 20:5n-3 (eicosapentaenoic acid; EPA) were significantly lower in the former (4.2 %) than in the latter (11.4 %). Differences in the levels of the two fatty acids between artificial pellets and wild fry stomach contents suggest that dietary differences caused the observed differences in fry fatty acid composition. The levels of 18:2n-6 and 20:5n-3 in hatchery fry collected in coastal waters decreased and increased, respectively, within days after stocking in the river. Furthermore, the levels became similar to those of riverine wild fry by approximately 20 days after stocking. These results indicate that the two fatty acids can be used to distinguish between hatchery and wild chum salmon fry in the natural environment. However, the period during which the two can be distinguished is limited.

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脂肪酸标记在区分孵化场和野生鲑鱼鱼苗中的应用，以及对放养后脂肪酸水平变化的描述

研究了鲑鱼鱼苗的脂肪酸组成，以区分自然环境下的孵化场和野生鱼苗。在孵化场获得的鱼苗中18:2n-6（亚油酸）含量（%）（13.0 %）显著高于在河流中收集的野生鱼苗（2.1 %）。相反，前者的20:5n-3（二十碳五烯酸；EPA）水平（4.2 %）显著低于后者（11.4 %）。人工鱼丸和野生鱼苗胃内容物中两种脂肪酸含量的差异表明，饲料差异导致了鱼苗脂肪酸组成的差异。在近岸水域采集的鱼苗中，18:2n-6和20:5n-3的含量在放养后数天内分别下降和上升。此外，放养后约20天，水平与河流野生鱼苗相似。这些结果表明，这两种脂肪酸可用于在自然环境中区分孵化场和野生鲑鱼鱼苗。然而，两者可以区分的时间是有限的。

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来源期刊

Fisheries Research 农林科学-渔业

CiteScore

4.50

自引率

16.70%

发文量

294

审稿时长

15 weeks

期刊介绍： This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.