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Hatching in the monogenean parasite Dictyocotyle coeliaca from the body cavity of Raja naevus

Published online by Cambridge University Press:  06 April 2009

Graham C. Kearn
Graham C. Kearn
Affiliation:
School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ, U.K.
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Extract

When eggs of the monogenean Dictyocotyle coeliaca, a parasite from the body cavity of Raja naevus, are incubated in alternating 12 h periods of light and darkness at 12 °C the marginal hooklets appear between 75 and 90 days after collecting the eggs from the host's body cavity and hatching begins after about 102 (96–109) days. Hatching occurs continuously throughout the light and dark periods so that there is no daily hatching rhythm, and host skin mucus and fluid from the host's body cavity (previously deep frozen and thawed before use) are ineffective as hatching stimulants. The significance of these observations in relation to host behaviour is discussed.

Type
Research Article
Information
Parasitology , Volume 70 , Issue 1 , February 1975 , pp. 87 - 93
Copyright
Copyright © Cambridge University Press 1975

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