Infection seasonality of Tracheliastes maculatus Kollar, 1835 (Copepoda, Siphonostomatoida, Lernaeopodidae) in the warm-water canal of "Dolna Odra" power plant.

Freshwater bream Abramis brama inhabiting warm-water discharge canal of the "Dolna Odra" Power Plant (Poland) were surveyed within 1983-1986 for their copepod parasites Tracheliastes maculatus. A total of 812 bream was studied and 561 females and 7 males of the parasite were recovered. The overall prevalence (for the whole survey) was 23.3% and the overall abundance was 0.69. T. maculatus were prevalent and abundant in winter while in summer they were encountered sporadically. The seasonality of the parasite exhibited consistent pattern within the studied period and it showed no signs of rise beyond the natural balance limits.