Aleutian disease poses a significant threat to the eel breeding industry, with widespread outbreaks and high rates of infection and mortality. This condition severely impairs the reproductive functions of eels, leading to substantial economic losses. In this report, the author presents the treatment outcomes of 12 cases, all of which were successfully cured. The findings are detailed below.
Epidemiologically, the disease is caused by the Aleutian virus, which spreads both vertically (from parent to offspring) and horizontally (through direct or indirect contact). Outbreaks are most common during autumn and winter, and the mortality rate remains alarmingly high. Infected eels often develop chronic infections, with symptoms lasting several weeks to months.
Clinically, affected eels exhibit a range of distressing signs, including loss of appetite, progressive weight loss, excessive thirst, and frequent drinking. Their mucous membranes appear pale, and they may show bleeding gums, ulcers, and dark, tar-like stools. These symptoms are indicative of systemic damage and poor health.
During necropsy, the disease primarily affects vital organs such as the liver, spleen, and kidneys. Post-mortem examination reveals that these organs are often enlarged and contain gray or white areas of necrosis. Such pathological changes are key indicators for diagnosing the disease.
Diagnosis can be made based on the combination of epidemiological data, clinical signs, and necropsy findings. For treatment, the author administered 1 mL of Banlangen injection via intramuscular or subcutaneous injection once daily in the afternoon. The treatment was repeated 3 to 6 times, depending on the severity of the case, and all patients showed full recovery.
This case series highlights the importance of early detection and timely intervention in managing Aleutian disease. Further research is needed to explore more effective prevention strategies and improve long-term outcomes for eel populations.
(Li Jun)
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