On some problems in biology of minnow, Phoxinus phoxinus (L.) (Cyprinidae) in the river Skawa

A preliminary biological characteristics of Phoxinus phoxinus (L.) in the river Skawa is given. Age of the individuals examined was determined from opercular bones; the age was found to range from 1+ to 6+ yr. Growth rate was back calculated. Filamentous algae and insect larvae turned out to be the main food items of the species within the period of study.;