Abstract
Skin neoplastic lesions have been studied in bream inhabiting the Curonian Lagoon of the Baltic Sea in 1999–2010. A total of 12163 fish specimens have been examined. Two types of lesions have been revealed: epidermal hyperplasia and skin papilloma, considered to be the successive stages of the epizootic cutaneous papillomatosis in fish. This disease has been registered in 18.5% of fish older than 5 years. The share of diseased specimens increases with age and reaches 62.5% in 15-year-old fish. The prevalence of lesions in males is significantly higher (12%) than in females (5.3%). The number of diseased fish in winter (30.2%) is higher than in summer (15.6%). The maximum share of fish with neoplasms has been recorded in 2006 (40%). Since 2007, there has been a trend towards a decrease in the prevalence of skin neoplastic lesions, and the average occurrence of diseased fish has reached 7.3%. The high prevalence of skin neoplasms (SNs) in bream is evidence of the unfavorable ecological situation in the Curonian Lagoon.
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