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The fish fauna of the lower Plonia River, above and below, the discharge point of the partly treated manure from the Pig Farm at Kolbacz-was surveyed in the years of 1992-1994. Electrofishing conducted four times on the same sections of the river yielded a total of 5 773 fishes, representing 21 species. The fishes belonged to 8 families and they were assigned to four feeding guilds. The highest occurrence constancy index (100%) was observed in roach, perch, and pike. The above species represented also the highest dominance index (67.71, 14.77, and 4.07% respectively).

Dominance and occurrence constancy of the fish species in the lower Płonia River