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Author Karvonen, Anssi ♦ Savolainen, Miia ♦ Seppälä, Otto ♦ Valtonen, E. Tellervo
Source SpringerLink
Content type Text
Publisher Springer-Verlag
File Format PDF
Copyright Year ©2006
Language English
Subject Domain (in DDC) Technology ♦ Medicine & health
Subject Keyword Microbiology ♦ Medical Microbiology ♦ Immunology
Abstract Ecologically sustainable disease prevention in intensive monocultures, such as fish farming, is based on the knowledge of the ecology of parasites and the identification of the key proportion of host populations for parasite life cycles. In this paper, we examined the life cycle dynamics of the pathogenic trematode Diplostomum spathaceum at a fish farm during a period of 1 year, focusing especially on the pattern of infection in the snail host (Lymnaea stagnalis) population, which is the key phase in the parasite life cycle regarding preventative actions. We found that (1) the infection varied seasonally in snails, being highest in late August; (2) the prevalence of infection and the proportion of individuals releasing cercariae were strongly dependent on snail size; (3) the parasite over-wintered in snails as dormant sporocysts and 4) the mortality of infected snails was not likely to differ from uninfected individuals during winter. Furthermore, the seasonality and development of the infection in the snails corresponded to the pattern of infection observed in the tracer rainbow trout caged in the farm area. This pattern of infection also indicated strong spatiality of the infection, probably because of differences in the size of the snail population between the ponds rather than differences in the prevalence of infection. Overall, present results indicate a possibility for late-summer outbreaks of D. spathaceum, but also that snail prevention at farms could be conducted more efficiently by considering both size-dependent infection and the timing of cercarial release.
ISSN 09320113
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2006-03-25
Publisher Place Berlin/Heidelberg
e-ISSN 14321955
Journal Parasitology Research
Volume Number 99
Issue Number 4
Page Count 5
Starting Page 341
Ending Page 345

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Source: SpringerLink