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The identity of the larval nematodes found in the body muscles of the cod (Gadus callarias L.)

Published online by Cambridge University Press:  06 April 2009

J. N. R. Grainger
J. N. R. Grainger
Affiliation:
Department of Zoology, The University, Hull
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Extract

Larval nematodes occurring in cysts in the body musculature of Icelandic cod have been identified as belonging to Porrocaecum Raillet & Henry, 1912 (subgenus Terranova Leiper & Atkinson, 1914), probably P. decipiens Krabbe and Anisakis Dujardin, 1845. Identification was made possible by rearing them in vitro to the pre-adult condition. The experiments show that the following conditions are necessary for the moult to the pre-adult state; (1) a fairly high culture temperature (37° C.); (2) the presence of pieces of fish for 24 hr. towards the beginning of the culture period. 1 % pepsin, while it assists the hatching from the cysts, is not essential for the moult to the pre-adult condition. Experiments indicate that the moult takes place 3–5 days after fish has been supplied.

The larvae and pre-adults of both genera are described. Samples of larvae from cod from Greenland and the Barents Sea probably consist only of Porrocaecum and Anisakis, but a sample from West Scotland contained only Porrocaecum. The significance of the moult to the pre-adult state is discussed.

Type
Research Article
Information
Parasitology , Volume 49 , Issue 1-2 , May 1959 , pp. 121 - 131
Copyright
Copyright © Cambridge University Press 1959

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