Search for: [Abstract = "A collection of 16,005 fish and suckers collected at 117 fishing sites from the River Nida drainage basin was arranged with the help of cenological methods. Similar river zones were distinguished on the basis of dominating and other fish species. These zones are different from the zones or reaches distinguished on the basis of river fall or on other morphological elements used to characterize the rivers and streams. The problems of combined or separated occurrence of fish species and the degree of their ecological relations were also investigated. An attempt was made to distinguish the characteristic, transistory and eurytopic fish species in the studied area."]

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