Original scientific paper
About loach in the Sava river
D. Ivelić
I. Jablan
S. Svjetličić
M. Piria
Abstract
Cobitidae family contains cca 160 species but there isn't enough data on the genus Cobitis. In the Sava river near Zagreb, two species of the genus Cobitis were recorded C. elongata and C. elongatoides. Both species live together in the mud covered slow flowing sections of the river. As no data on the biology of these two loach were found in literature, the aim of this study was to research the conditions of the loach from the Sava river.
The fish were caught by electric gear on three locations in May 2006. Also, macroinvertebrates were collected and physical and chemical analyses of water were performed. Quality of water of the Sava river is sufficient for growth, reproduction and presence of C. elongata, it is less so for C. elongatoides. Macroinvertebrates are present with 10 taxa at three investigated sites. Crustacea was dominant at Medsave site, Oligochaeta at Lijevi Dubrovčak site and Diptera and Gastropoda at Setuš site.
There are some differences in morphometric parameters of both species, due to the differences in the body dimensions. Main differences occurred when measuring the value of prepectoral distance, the end of prepectoral distance and preventral distance of the fin. Condition factor of C elongata was lower (0,61) than that of C. elongatoides (0,81). Length-mass relationships of C. elongata could be expressed by the following formula: W= 0,0039 * SL3,2063, and C. elongatoides W= 0,0057 * SL 3,1872
Keywords
C. elongata; C. elongatoides; Sava river; macroinvertebrates
Hrčak ID:
18902
URI
Publication date:
15.10.2007.
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