COMPARATIVE STUDY OF LENGTH-WEIGHT RELATIONSHIP, SIZE STRUCTURE AND FULTON’S CONDITION FACTOR FOR PRUSSIAN CARP FROM DIFFERENT ROMANIAN AQUATIC ECOSYSTEMS

Abstract

Length-weight relationship, Fulton’s K condition factor and the size structure were assessed for unsexed Prussian carp, Carassius gibelio (Bloch, 1782) caught from three different Romanian aquatic ecosystems: Cişmigiu Lake (Bucharest, October 2014), Brăneşti 3 Lake (Ilfov County, May 2015) and Sâi River (Teleorman County, April 2015). Positive allometric growth was estimated for specimens sampled from Cişmigiu Lake and Sâi River, while Prussian carp from Brăneşti 3 Lake exhibited a negative allometric growth pattern. Some physico-chemical parameters (pH, total dissolved solids, nitrite, nitrate, ammonium, phosphate, electrical conductivity, total hardness) were also recorded, in order to estimate the impact of water quality on C. gibelio population from Cişmigiu and Brăneşti 3 lakes. Both lentic ecosystems were found to be within the suitable range for well being of fish. To our knowledge, this paper provides first published information on length-weight relationship of a fish species inhabiting the freshwater ecosystems Sâi River and Brăneşti 3 Lake.