The aim of this study was to develop a method to kill or expel the gill-dwelling crustacean parasite Paraergasilus rylovi from a common freshwater clam, Anodonta piscinalis. Naturally infected clams were exposed to different water-quality treatments and monitoring in the laboratory. In a high-temperature treatment (26 C vs. control 18 C), the mean abundance of the parasite decreased to near zero in 7 days. Because only 2 clams of 72 died in this treatment during the 14-day experiment, the survival of the host was not seriously at risk at the high temperature. ‘Low oxygen, no water change’ (18 C) was the second most effective treatment, followed by a ‘low-oxygen, water-flow’ (18 C) treatment. At the end of the experiment, the mean parasite abundance was significantly lower in all the treatments than in the control clams (18 C). A few P. rylovi individuals abandoned the host at 26 C but died in a couple of days outside the host. However, the parasites lived on average (±SE) 12.7 ± 0.9 days outside the clam, and were also shown to be capable of infecting another uninfected host individual, at 18 C. The results of the present study suggest that high temperature provides an effective, ecologically sustainable method to manipulate the intensity of P. rylovi infection.
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December 2003
INVERTEBRATE-PARASITE RELATIONSHIPS|
December 01 2003
REDUCTION IN THE LEVEL OF INFECTION OF THE BIVALVE ANODONTA PISCINALIS BY THE COPEPOD PARAERGASILUS RYLOVI USING HIGH TEMPERATURE AND LOW OXYGEN
M. Saarinen;
M. Saarinen
Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, FIN-40014 University of Jyväskylä, Finland. marisaar@bytl.jyu.fi
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J. Taskinen
J. Taskinen
Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, FIN-40014 University of Jyväskylä, Finland. marisaar@bytl.jyu.fi
* Institute of Applied Biotechnology, University of Kuopio, P.O. Box 1627, FIN-70211 Kuopio, Finland
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J Parasitol (2003) 89 (6): 1167–1171.
Citation
M. Saarinen, J. Taskinen; REDUCTION IN THE LEVEL OF INFECTION OF THE BIVALVE ANODONTA PISCINALIS BY THE COPEPOD PARAERGASILUS RYLOVI USING HIGH TEMPERATURE AND LOW OXYGEN. J Parasitol 1 December 2003; 89 (6): 1167–1171. doi: https://doi.org/10.1645/GE-3238
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