Look, she's really intense about squirrels.

[And possibly about everything. Do either of them remember what it felt like to not be old and tired? Nah.]

Well, then, obviously someone who can talk to fish wouldn't be able to talk to lizards. Or crocodiles, or whatever. There's the answer to your question.

[Unless there was some mysterious superhero with the ability to communicate with all aquatic lifeforms...nah, too far-fetched.]