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1 October 1997 A Trematode Metacercaria Causing Gill Cartilage Proliferation in Steelhead Trout from Oregon
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Abstract

Gills of steelhead trout (Oncorhynchus mykiss) held in liveboxes to detect the presence of pathogens in the Willamette River (Oregon, USA) became heavily infected with trematode metacercariae. The metacercariae encysted adjacent to the cartilaginous rods of gill filaments and elicited a host response of cartilage proliferation from the perichondrium. Although some hyperplasia of gill epithelium and fusion of lamellae was apparent, the extent of damage to the respiratory surface was apparently insufficient to cause trout mortality. Morphological characteristics of the metacercariae did not allow precise identification, but they suggested affinities to either the Heterophyidae or Cryptogonimidae. Some heterophyids are known to cause proliferation of cartilage in fish gills, while cryptogonimids are not. This is the first report of trematode induced gill cartilage proliferation in steelhead trout.

Olson and Pierce: A Trematode Metacercaria Causing Gill Cartilage Proliferation in Steelhead Trout from Oregon
Robert E. Olson and Jack R. Pierce "A Trematode Metacercaria Causing Gill Cartilage Proliferation in Steelhead Trout from Oregon," Journal of Wildlife Diseases 33(4), 886-890, (1 October 1997). https://doi.org/10.7589/0090-3558-33.4.886
Received: 10 August 1996; Published: 1 October 1997
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