Is It Possible to Stick a Hydrophone in a River and Tell It's Healthy?

Is it possible, do you think, to stick a hydrophul in the river and tell whether the river is healthy or not? Oh, that's a very good question. And you can definitely hear creatures in the river. What you can listen out for su like some, some of us went to a lake and recorded just what happens in the lake. You could actually hear little creatures and i think also am frogs and things in the river through the hydrophone.