Infection status of masu salmon Oncorhynchus masou by the parasite Salmonema cf. ephemeridarum (Nematoda, Cystidicolidae)

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...

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Bibliographic Details
Published in:Journal of fish biology 2024-04, Vol.104 (4), p.920-928
Main Authors: Ogura, Yuhei, Hasegawa, Koh
Format: Article
Language:English
Subjects:
Body condition
Condition factor
Energy reserves
Fish
Fish parasites
Fork length
Freshwater
hatchery fish
Hokkaido
Inland water environment
Nematodes
Oncorhynchus masou
Parasites
Salmon
Salmonema
salmonid
Salmonidae
Salmonids
Seawater
Shiribetsu River
wild fish
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Summary: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.
ISSN:0022-1112
1095-8649
DOI:10.1111/jfb.15631