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Parasite effects on the survival, growth, and reproductive potential of yellow perch (Perca flavescens Mitchill) in Canadian Shield lakes

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Abstract:

Three parasites of yellow perch, Perca flavescens, in four Canadian Shield lakes were studied for their effects on perch growth and mortality. Glugea sp. xenomas in cells of the intestinal wall and in visceral fat and Apophallus brevis metacercariae infecting the musculature reduced the growth of perch, causing mortality in younger and smaller fish. High numbers of Raphidascaris acus encysted in the liver of yellow perch correlated significantly with a reduction in visceral-fat mass in age 1+ females and age 0+ and 1+ males. A significant correlation in these subsamples indicates that host sex, size, trophic status, and relative mass of the liver are linked to R. acus density. Our data suggest that interactions among parasitic infections and age, size, and sex of the fish host can affect growth and survival of the host, especially during periods of low energy inputs and reproductive stress.

Nous avons étudié les effets de trois parasites de la Perchaude (Perca flavescens) sur la croissance et la mortalité des poissons dans quatre lacs du Bouclier canadien. Des xénomas de Glugea sp. dans les cellules de la paroi intestinale et dans la graisse des viscères et des métacercaires d'Apophallus brevis dans la musculature ralentissent la croissance des perchaudes entraînant la mortalité de jeunes et de poissons de petite taille. Des nombres importants de Raphidascaris acus enkystés dans le foie des perchaudes sont en corrélation positive significative avec la masse des graisses viscérales des femelles 1+ et des mâles 0+ et 1+. Une corrélation significative dans ces sous-échantillons indique que le sexe, la taille, le statut trophique et la masse relative du foie de l'hôte sont reliés à la densité de R. acus. Nos données indiquent que le interactions entre les infections parasitaires d'une part et l'âge, la taille et le sexe de l'hôte, d'autre part, peuvent affecter la croissance et la survie de l'hôte, particulièrement pendant les périodes d'apports énergétiques réduits et de stress relié à la reproduction.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: November 1, 2001

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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