2026-03-12T00:54:08Z https://fra.repo.nii.ac.jp/oai

oai:fra.repo.nii.ac.jp:02000179 2025-03-28T08:45:35Z 15

Infection status of masu salmon Oncorhynchus masou by the parasite Salmonema cf. ephemeridarum (Nematoda, Cystidicolidae) Ogura, Yuhei 小倉, 裕平 オグラ, ユウヘイ Ogura 小倉 オグラ Yuhei 裕平 ユウヘイ 00603325 0000-0001-6827-8322 Hasegawa, Koh 長谷川, 功 ハセガワ, コウ Hasegawa 長谷川 ハセガワ Koh 功 コウ Hokkaido; Shiribetsu River; condition factor; hatchery fish; salmonid; wild fish Nematodes that parasitize salmonids are found in both seawater and freshwater. Unlike seawater species such as those in family Anisakidae, freshwater species have not been well studied. In particular, the influences of these nematodes on the body condition of salmonids remain unclear. We studied the effects of Salmonema cf. ephemeridarum on the body condition of masu salmon Oncorhynchus masou. We found a positive relationship between the number of parasites and fish fork length. In contrast, we found a negative relationship between the body condition (condition factor) of fish and the number of parasites. These results suggest that nematode infection could affect host energy reserves for future growth. Wiley 2023-11-27 eng journal article AO https://fra.repo.nii.ac.jp/records/2000179 38009677 10.1111/jfb.15631 23241003 水産資源研究所　さけます部門　資源生態部 https://onlinelibrary.wiley.com/doi/10.1111/jfb.15631 WILEY : Online Library https://pubmed.ncbi.nlm.nih.gov/38009677/ Pub Med 1095-8649 Journal of fish biology