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Histopathologic alterations associated with Anisakis larvae in Pacific herring from Oregon
Journal of Wildlife Diseases
|July 1, 1977
Summary
Anisakis sp. larvae cause significant tissue damage in Pacific herring, including pancreatic and liver lesions. Immune cells like macrophages and lymphocytes respond to these parasitic infections in the fish.
Area of Science:
- Veterinary Pathology
- Parasitology
- Ichthyology
Background:
- Anisakis sp. are common parasites in marine fish.
- Pacific herring (Clupea harengus pallasi) are important commercial and ecological species.
- Understanding parasite-host interactions is crucial for fish health.
Purpose of the Study:
- To histopathologically examine tissue alterations caused by Anisakis sp. larvae in Pacific herring.
- To identify the cellular responses within affected tissues.
Main Methods:
- Histopathologic examination of Anisakis sp. infected Pacific herring.
- Microscopic analysis of tissue samples from liver, pancreas, and pyloric caeca.
Main Results:
- Observed mechanical compression of the pancreas and liver.
- Identified granulomatous inflammation and necrosis in the liver.
- Documented trauma to the muscularis externa of the pyloric caeca.
- Found macrophages (histiocytes) and lymphocytes in host exudate within lesions.
Conclusions:
- Anisakis sp. larvae induce significant histopathologic changes in Pacific herring.
- The host immune system mounts an inflammatory response involving macrophages and lymphocytes to Anisakis infections.