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Temperature-dependent reproduction and survival of Gyrodactylus salaris Malmberg, 1957 (Platyhelminthes: Monogenea) on Atlantic salmon (Salmo salar L.)

Published online by Cambridge University Press:  06 April 2009

P. A. Jansen  and
T. A. Bakke
P. A. Jansen
Affiliation:
Zoological Museum, University of Oslo, Sars Gt 1, N-0562 Oslo 5, Norway
T. A. Bakke
Affiliation:
Zoological Museum, University of Oslo, Sars Gt 1, N-0562 Oslo 5, Norway
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Summary

The relationship of survival and reproduction of Gyrodactylus salaris Malmberg on the Atlantic salmon (Salmo salar) to water temperature (2·5–19·0 °C), was studied on the basis of temporal sequence of births and age at death of individual parasites on isolated salmon, and of infrapopulation growth on isolated and grouped salmon. Mean life-span of the parasite was negatively correlated with water temperature: 33·7 days at 2·5 °C and 4·5 days at 19·0 °C. The average number of offspring per parasite peaked between 6·5 and 13·0 °C, and was approximately 2·4 at these two temperatures. Both the period between the successive births of the offspring (max 4) and the estimated generation time were negatively correlated with temperature. The innate capacity for increase (rm) was positively correlated with temperature: from 0·02 (/parasite/day) at 2·5 °C to 0·22 (/parasite/day) at 19·0 °C. Growth of the infrapopulations was positively correlated with water temperature and was higher on isolated fish than on grouped fish, though less than the potential parasite population growth estimated from rm. In the infrapopulations the mean intensity of parasites continued to increase throughout all the experiments on both isolated fish and on grouped fish.

Keywords

Gyrodactylus salarisSalmo salarsurvivalreproductive ratetemperaturepopulation growth
Type
Research Article
Information
Parasitology , Volume 102 , Issue 1 , February 1991 , pp. 105 - 112
Copyright
Copyright © Cambridge University Press 1991

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