MORPHOLOGICAL CHARACTERISTICS OF TENCH (TINCA TINCA L) OF SUMY AND CHERNIHIV REGIONS

Abstract

The purpose of the work was to conduct a morphobiological analysis of tench from two reservoirs of the Sumy (2011) and Chernihiv (2012) regions, which, according to certain characteristics, are similar.
It can be argued that out of 24 signs belonging to the body, 14 signs and 7 signs on the head differ the most. Features that differ the most in terms of body parameters: body length, which is greater in the Sumy tench than in Chernihiv, antianal distance, pectroventral and ventroanal distance, length of the base of the fins – dorsal, pectoral, abdominal and caudal. In turn, tench from the reservoirs of Chernihiv region prevailed over tench from Sumy region according to such indicators as the length of the tail stalk, the height of the dorsal fin and the length of the base of the anal fin, and the length of the head. In relation to the head, the tench from Sumy region prevails over Chernihiv region in terms of: snout length, extraocular distance, forehead width, head height, height of the head near the back of the head, and, conversely, the tench from Chernihiv region prevails over the tench from Sumy region only in terms of eye diameter.
Tench from the reservoir of the Sumy region has a longer body length, displaced dorsal and anal fins to the tail stem, enlarged pectoral, abdominal and tail fins, which indicates a more mobile lifestyle. The head, although smaller, is more adapted for finding food. The tench from the Chernihiv region has a more elongated tail stem, the height of the dorsal and anal fins, which indicates that it is more settled and moves around the pond seasonally, the head is larger, but the diameter of the eye is also large, which indicates that the tench is on greater depth than the tench from the reservoir of the Sumy region.