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

doi:10.13287/j.1001-9332.201707.023

Abstract

Abstract: 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.

HE Yong-feng, WU Xing-bing, WANG Xu-ge, ZHU Yong-jiu, YANG De-guo. Otolith carbon and oxygen stable isotopes in laboratory-reared Schizothorax kozlovi[J]. Chinese Journal of Applied Ecology, 2017, 28(7): 2339-2343.

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