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Evidence of return of chum salmon released from Tangwang River by strontium marking method


In order to assess the effect of enhancement release of chum salmon (Oncorhynchus keta), otolith strontium (Sr) marking method was used to tag chum salmon released in Tangwang River in 2016. The homing chum salmon were detected and the samples were collected in Tangwang River, Ussuri River and Suifen River in the autumn of 2018. The samples were analyzed by examining Sr and calcium (Ca) fingerprints in the otolith using electron probe microanalysis. The results suggested that two samples collected in Tangwang River had the marking ring near the core of otolith where the Sr concentration and Sr/Ca ratio were significantly higher than comparative samples. Proving that the two fish belonged to the released population in Tangwang River in 2016. This article indicated the success of the enhancement release of chum salmon from the Tangwang River for the first time and also confirmed the validity of Sr marking in enhancement release of fishes.

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We greatly appreciate assistance provided by the fisherman at the three sampling stations in obtaining specimens. We are also grateful to the anonymous reviewers for their valuable suggestions.

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Corresponding author

Correspondence to Wei Liu.

Additional information

Foundation item

The Natural Science Foundation of Heilongjiang Province of China under contract No. YQ2019C034; the Special Financial Funds of the Ministry of Agriculture and Rural Affairs under contract No. 2130135.

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Wang, J., Liu, W., Li, P. et al. Evidence of return of chum salmon released from Tangwang River by strontium marking method. Acta Oceanol. Sin. 40, 182–186 (2021).

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Key words

  • chum salmon (Oncorhynchus keta)
  • otolith
  • strontium (Sr) marking
  • enhancement release