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New Zealand Journal of Marine and Freshwater Research abstractsDistribution of helminths in the digestive tracts of New Zealand freshwater eels 1. Distribution of digeneansP. M. HINEFisheries Research Division, Ministry of Agriculture and Fisheries, P.O. Box 19062, Wellington, New ZealandAbstract The distributions of Stegodexamene anguillae and Telogaster opisthorchis in Anguilla dieffenbachii and A. australis studied over two years are described. Peak occurrence of S. anguillae was in the anterior intestine, declining posteriorly, except for mature flukes under crowded conditions in A. dieffenbachii which predominated in the mid intestine, declining anteriorly and posteriorly. Peak occurrence of T. opisthorchis was in the rectum of A. australis and posterior intestine of A. dieffenbachii; occurrence declined anteriorly. Distributions appeared to be maintained by selective site segregation. Flukes moved down the tract, with or without subsequent loss, in both host species held live or examined after death. T. opisthorchis were lost before S. anguillae, and the larger mature flukes of both parasite species were lost before the less mobile immature flukes. Fluke loss from electric-fished A. dieffenbachii was more rapid than from netted A. australis. Chilling and freezing retarded movement in, and evacuation from, dead hosts.Keywords Anguilla australis; Anguilla dieffenbachii; gut helminths; digeneans; gut distribution; Stegodexamene anguillae; Telogaster opisthorchis; parasites. New Zealand Journal of Marine & Freshwater Research, 1980, 14(4): 329-338
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