An abnormal increase in the number of skeleton counting elements in two specimens of the roach Rutilus rutilus (L.) from industrially polluted ponds

The cases of catching adult specimens of roach with an unusually high number of branched rays in the dorsal fin (14) and the double-row formula of pharyngeal teeth (1.6-5) in two small ponds of the Udmurt Republic with a high level of technogenic pollution are described.