Freshwater equivalent of this sub?

I adore lurking in this sub. The quality of posts and information is top notch and you guys are amazing!

As much as I admire marine life, I'm not keen on working with it as a primary focus and would love to focus on freshwater ecology in future studies. When I type in the app search all the recommended subs seem to be...well...dead.

Can anyone recommend a quality freshwater ecology sub to join?