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Necropsy-based Wild Fish Health Assessment
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Neoplasms of the urinary tract in fish
E D Lombardini1, G C Hard2, J C Harshbarger3
1Armed Forces Research Institute of Medical Sciences, Bangkok, Thailand Lombardinied@afrims.org.
Veterinary Pathology
|December 10, 2013
Summary
Primary urinary tract tumors in fish are rare, with most kidney and bladder neoplasms being single reports. Genetic predisposition, environmental factors, or infections may contribute to specific fish tumor development.
Area of Science:
- Veterinary Pathology
- Ichthyology
- Oncology
Background:
- Primary urinary tract tumors in fish are infrequently documented in scientific literature.
- Most reported cases of kidney and urinary bladder neoplasms are isolated incidents.
- Existing reports suggest potential genetic, environmental, or infectious etiologies for fish neoplasms.
Purpose of the Study:
- To review and consolidate existing knowledge on primary urinary tract tumors in fish.
- To highlight potential contributing factors in the development of fish neoplasms.
- To provide context for rare cases of renal lymphoma and plasmacytic leukemia in fish.
Main Methods:
- Literature review of published case reports and studies on fish urinary tract tumors.
- Analysis of data from the Registry of Tumors in Lower Animals.
- Synthesis of information regarding suspected etiologies such as genetic predisposition, environmental carcinogenesis, and infectious agents.
Main Results:
- Scattered reports of fish urinary tract tumors date back to 1906.
- Nephroblastomas in Japanese eels and adenomas/adenocarcinomas in Oscars suggest possible genetic links.
- Hematopoietic neoplasms, including renal lymphoma and plasmacytic leukemia, are infrequently primary to fish kidneys.
Conclusions:
- Primary urinary tract neoplasms in fish are rare, often presented as single case reports.
- Further research is needed to elucidate the roles of genetics, environment, and infectious agents in fish carcinogenesis.
- This review consolidates understanding of these rare conditions and informs future investigations.
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