Age structure, growth rate and condition factor of Squalius orpheus (Cyprinidae) of Maritsa river’s middle zone, Bulgaria
Keywords:Orpheus dace, weight growth, linear growth, size and age composition
Age, growth and condition factor were determined for Squalius orpheus of the Maritsa River’s middle zone. A comparison was made of length differences for the same age group of stream and reservoir populations. A total of 114 S. orpheus were caught and examined. The fish were classified in six age groups (1-6 years). One-year-old fish dominated the samples. Standard body lengths (SL) ranged from 3.4 to 30.5 cm and the length of the majority of the samples was between 5.0 and 7.0 cm. A length-weight relationship was described as W = 0.000009∙SL3.0934, (r2 = 0.9796, P < 0.05). Length growth was expressed as SL = 2.1554S+16,588, (r2 = 0.9927, P < 0.05). Condition factors and the coefficient from Fulton’s equation ranged from 1.26 to 1.53, with a mean value of 1.28. Fulton’s coefficient increased from one-year-old to five-year-old fish. The present study of Orpheus dace’s population parameters contributes to the knowledge of the species’ population biology.
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