Ben, welcome to Pond Boss.

The unqualified answers to your questions are basically "yes."

But you should give us a lot more details.

What all fish are in there?

How big are the stunted crappies?

Are you wanting the keep the crappies or get rid of them?

So many questions, but without the answers, it's hard to help.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."