Evidence of return of chum salmon released from Tangwang River by strontium marking method
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Abstract: 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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Key words:
- chum salmon (Oncorhynchus keta) /
- otolith /
- strontium (Sr) marking /
- enhancement release
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Figure 1. Sampling stations for chum salmon in Tangwang River, Ussuri River and Suifen River.
Figure 2. Fluctuation of otoliths Sr/Ca concentration ratios along line transects from the core (0 μm) to the edge in otoliths of Oncorhynchus keta.
Figure 3. Otolith Sr content of marked and unmarked Oncorhynchus keta with X-ray intensity mapping analysis. Values corresponding to Sr concentration are represented from red (highest) through yellow and green, to blue (lowest). The reddish annular band indicates marking ring.
Table 1. The basic information of chum salmon samples
Samples Sex Body fork length/cm Body weight/g Age Sampling river C1 Female 65.5 2 859.5 3+ Tangwang River C2 Female 58.8 2 385.2 2+ Tangwang River C3 Male 48.9 1 019.7 2+ Tangwang River C4 Female 58.2 1 807.6 3+ Tangwang River C5 Male 55.1 1 703.7 2+ Ussuri River C6 Female 66.2 3 013.6 4+ Ussuri River C7 Female 69.8 3 902.5 4+ Ussuri River C8 Male 71.9 3 012.3 5+ Ussuri River C9 Male 46.3 1 205.9 1+ Suifen River C10 Male 44.9 1 098.2 1+ Suifen River C11 Male 49.2 1 322.5 2+ Suifen River C12 Female 54.9 1 761.6 2+ Suifen River 
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