Why are round whitefish endangered?

There is no fish species commonly known as "round whitefish". It's possible there's a misunderstanding or a less common name.

To help me understand what you're looking for, could you please provide:

* The full scientific name of the fish you're interested in, if you know it.

* Any other details about the fish, like its habitat, location, or any specific characteristics.

With more information, I can give you a more accurate answer about why a specific fish species might be endangered.