>>217091It could definitely be fish less, but most of the fishless lakes I know are much more northern, where they were glaciated more recently - hence my attached pic of the Laurentide Ice Sheet in the last post.
10,000 years ago all of Canada was covered in ice. As far as I know much of Washington was not... all this to say that the lake you know has had a longer ice-free history where it could have had fish introduced in some way or another.
Biologically speaking, isolated lakes are very interesting. If shut off from outside systems for long enough the species in there can develop in unique ways, sometimes becoming entirely new species.
An extreme example of this would be the rift lakes in Africa. Highest freshwater fish diversity in the world (and rapidly getting fucked by humans).
