Can we make the fish smaller in size?
There's a smaller catfish, but it's higher up off of the ground. The catfish summoned by the kettle are supposed to be a monstrous version of this real-world animal:
[youtube=425,350]http://www.youtube.com/watch?v=m4a-ckzpD0I[/youtube]
The monstrous version is lower to the ground and thus can pass for a "walking catfish." They're also the same CR as the carnivorous apes.
In PnP the item summoned flying fish. While there's no model currently like a flying fish in NWN at the moment, the CEP stingrays are basically modified bat models and thus look more like they are flying than swimming. If you guys would prefer that, I can replace the catfish with a "flying fish" instead. They just seemed sillier than a walking catfish.