Word for a body of water that is sufficiently populated with fish and worthy of fishing in

My game is exploration-and-interaction base. Now that the player has struggled and found a fishing rod, I would like my character to convey the message that "this pond appears to be sufficiently populated with fish, and it is a worthy place to consider fishing."

How can I convey these two ideas in one word or in a short phrase?

I think the word you're probably looking for is "teeming", which describes something as being densely populated or swarming with life.

In your case, the appropriate phrase would probably be something like:

"This pond is teeming with fish! Maybe I can catch one."

A piscary is a body of water natural or artificial (a piscine would only be an artificial one) under active piscicultural care to render it fit for piscation and related piscatorial—or simply piscatory—pursuits perpetrated by piscivorous piscators, at which point said piscose body will be perfectly pisculent — that is, it will be fit for fishing.

But I predict a potential problem if you go with pisculent and related terms.

Although all these words are of obvious meaning and attested by the OED, it is always possible that some petty pissants hearing such words will perceive them as presenting the pissants not with a piscary but with a pissoir, and perforce pitch a personal pot of puissant poison into your pretty poisson pond in a puerile act of piscicide instead of fishing it per your preference.

Pity, that.

How about: "This pond looks well-stocked. I can fish here."

You could put more fish icons in a pond that's well-stocked; and fewer fish icons, or even green-blue algae in an ill-stocked pond. "This pond is filled with algae. I can't fish here"

The answer "this pond looks like a good place to fish", is an excellent phrase for your purposes. However, if you want a short way to describe a pond that is "fishing-worthy", the usual way of doing it in English is to say:

This pond has good fishing.

This pond looks quite fishable.

Yes, it is a real word.

(Dictionary.com)