Original scientific paper
SUCCESSION AND STRUCTURE OF THE FISH IN THE MAVROVO RESERVOIR (THE REPUBLIC OF MACEDONIA)
S. Georgijev
Abstract
Hereby are presented some ecological features of the fish inhabiting the Mavrovo Reservoir, one indigenous and six brought in; Salmo trutta (Linnaeus, 1758), Oncorhynchus mykiss (Walbaum, 1796), Leuciscus cephalus (Linnaeus, 1758), Pachychilon pictum (Heckel & Kner, 1858), Phoxinus phoxinus (Linnaeus, 1758), Barbus peloponnesius Valenciennes, 1844 and Alburnus alburnus (Linnaeus, 1758). The Ph. phoxinus species has disappeared in the course of the investigation. The most commonly found population is A. alburnus, followed by the P. pictum, an endemic species for the watershed and a benthal one, as the B. peloponnesius is. L. cephalus when young is a littoral and a free–swimming fish, and when adult it becomes benthal. The population of the indigenous S. trutta is devastated. Data on the condition coefficient, the l–w relationship, the coefficient of the maturity, nutrition, shows that all the species, with exception to the Ph. phoxinus that disappeared, enjoy favorable ecological conditions, in spite of the height of the reservoir of about 1233 m above the sea level and the harsh climate conditions during the winter time.
Keywords
Mavrovo Reservoir; Macedonia; fish ecology; Salmo trutta; limnetic habitat; Nacional Park; introduction
Hrčak ID:
4690
URI
Publication date:
25.6.2003.
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