Age and Growth of the Chub, Leuciscus cephalus L. from the Maritza River (South Bulgaria)

E. STEFANOVA1, E. UZUNOVA1, T. HUBENOVA2, P. VASILEVA2, D. TERZIYSKI2 and I. ILIEV2
1 University of Sofia, Faculty of Biology, Department of General and Applied Hydrobiology, BG - 1164, Sofia, Bulgaria
2 Institute of Fisheries and Aquaculture, BG-4003 Plovdiv, Bulgaria

Abstract

STEFANOVA, E., E. UZUNOVA, T. HUBENOVA, P. VASILEVA, D. TERZIYSKI and I. ILIEV, 2008. Age and growth of the chub, Leuciscus cephalus L. from the Maritza River (South Bulgaria). Bulg. J. Agric. Sci., 14: 214-220

Age-size structure and growth parameters of chub, Leuciscus cephalus were studied to obtain information on population status of this species from the middle section of the Matritza River. A total of 161 specimens were collected by electrofishing during the period between March to June 2007. Age groups 1+ to 4+ were observed in the chub population. The age group 2+ was most abundant (57.5%) followed by the fish from age group 1+ (27.5 %). In the investigated population dominated fish with size between 121 to 150 mm. The calculated weight-length relationship for chub could be explained by the follow equation: W=0.0148.L3.0595(r2 = 0.994; n=161). The length growth curve was calculated according to the von Bertalanffy equation: Lt = 488[1-e- 0.152(t- 0.05)]. The average condition factor for females and male fish was 2.52 and 2.01 respectively:

Key words: Leuciscus cephalus, Maritza River, length and weight relationships, growth, age and size composition, von Bertalanffy’s parameters, condition factor

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