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[Otolith carbon and oxygen stable isotopes in laboratory-reared Schizothorax kozlovi].

In order to investigate the role of otolith carbon (δ13C) and oxygen (δ18O) stable isotopes in identification of freshwater fish stocks, otolith δ13C and δ18O of cultured Schizothorax kozlovi at different ages were measured by stable isotope mass spectrometer. The relationships between otolith δ13C / δ18O and environment were discussed. The results showed that δ13C and δ18O values of S. kozlovi at age 1+ were not significantly correlated with otolith mass, but both were significantly different between lapillus and asteriscus. The average lapillus δ13C and δ18O values of S. kozlovi at different ages were (-9.58±0.06)‰ and (-8.33±0.17)‰, respectively. There was no significant difference of lapillus δ13C and δ18O between the sexes, but with significant difference among diffe-rent ages. The correlation of δ13C with δ18O was an effective method in identification of different culture stocks of S. kozlovi, which indicated the isotopic signatures of otolith could be used as a method to identify freshwater fish stocks.