* Variable Definition: What constitutes a "kind" of fish is subjective. Do we count subspecies? Do we consider introduced species?
* Ongoing Research: Fish populations and diversity are constantly changing, and research on the Yukon River is ongoing.
* Data Accessibility: While there are resources available, a comprehensive list might not be publicly available.
However, here's what we do know:
* Diverse Ecosystem: The Yukon River is a rich and varied ecosystem, known for its diverse fish species.
* Salmon Species: It's particularly famous for its salmon runs, including Chinook, sockeye, coho, and chum salmon.
* Other Notable Species: The Yukon River is home to a variety of other fish, including grayling, whitefish, pike, and burbot.
To get a better idea of the specific number, you could:
* Contact a local fish and wildlife agency: The Yukon Department of Environment or the Alaska Department of Fish and Game might have more specific data.
* Consult scientific publications: Research papers on the Yukon River's fish fauna may offer more precise estimates.
I hope this helps!