Invasion status of hatchery-origin pink salmon in an unstocked river at the Shiretoko World Natural Heritage Site in northern Japan

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Abstract
The reproductive success of wild anadromous salmonid populations can be reduced by genetic interactions with straying hatchery fish. We investigated the straying status of hatchery-origin pink salmon (Oncorhynchus gorbuscha), which have a higher straying rate than other salmonids, in an unstocked river in the Shiretoko World Natural Heritage Site, Japan, which is a data-poor region. Hatchery strays accounted for 40.0% and 19.0% of the total samples in 2021 and 2022, respectively. These results indicate that hatchery pink salmon have invaded unstocked rivers and potentially genetically affect wild populations.
Funding Information
  • Japan Society for the Promotion of Science (21H03647 and 22J11475)
  • Japan Science and Technology Agency (JPMJSP2119)

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