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Differences in susceptibility of the European eel (Anguilla anguilla) and the Japanese eel (Anguilla japonica) to the swim-bladder nematode Anguillicola crassus

Published online by Cambridge University Press:  14 September 2004

K. KNOPF  and
M. MAHNKE
K. KNOPF
Affiliation:
Department of Inland Fisheries, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany
M. MAHNKE
Affiliation:
Department of Inland Fisheries, Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany
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Abstract

The swim-bladder nematode Anguillicola crassus originates from the Far East where it is a parasite of the Japanese eel (Anguilla japonica). After A. crassus was introduced to Europe, it became a predominant parasite of the European eel (Anguilla anguilla). A study performed with experimentally infected eels (98 days, 23 °C) revealed significant differences in the susceptibility of the two eel species to this parasite. The recovery rate of 30 administered infective A. crassus larvae (L3) from A. japonica was less than half of that from A. anguilla (33·2% and 13·8%, respectively). Almost 60% of the worms recovered from A. japonica were found as dead, encapsulated and necrotic larvae in the swimbladder wall. In contrast, no dead larvae were found in A. anguilla. Additionally, the development of the worms was shown to be significantly slower in A. japonica compared with A. anguilla. The lower survival rate of the worms, together with their slower development, resulted in a significantly lower adult worm burden (11 and 428 mg wet weight, respectively) and in a decreased reproductive success in A. japonica compared with A. anguilla. These results demonstrate that the original host, A. japonica, possesses more effective defence mechanisms against A. crassus than does the non-adapted host, A. anguilla.

Keywords

Anguilla anguillaAnguilla japonicaAnguillicola crassussusceptibilityexperimental infection
Type
Research Article
Information
Parasitology , Volume 129 , Issue 4 , October 2004 , pp. 491 - 496
Copyright
2004 Cambridge University Press

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