Bingo. A long quote, but hey.
Oscar ended up being a cleaner wrasse, which is a colorfully striped fish of blue, black and yellow. True to its name, a cleaner wrasse’s actual job is to clean other fish and its environment, which made working at the Whale Wash the perfect job for Oscar. Appropriately, Angie is an angelfish. Character technical director co-supervisor Kevin Ochs says, “We were looking for something elegant and the big, billowing fin, which we used as Angie’s hair, is characteristic to an angelfish—very flowing, very elegant.”
Lola, on the other hand, is predominantly a lion fish, with a little dragonfish mixed in for effect, making her as lethal as she is beautiful. “Lion fish are very beautiful,” Ochs relates, “but they are also very deadly. They have very powerful venom in their spines, so they basically lure their prey close only to deal a deadly end, so that was very fitting for Lola.”
Sykes is a puffer fish, with spines that make him look like he’s some sort of tough guy, but when he gets nervous, he puffs up and his voice gets high, which basically destroys the pretense. While traits of their respective species can be seen in the different fish characters, there are also none-too-subtle hints of the actors playing them evident in each one. Sykes’ Scorsese-esque “eyebrows” are among the most obvious features that reflect the actor behind the character, but they are only a fraction of what an observant moviegoer might catch.
EDIT- I think Oscar is based on this -http

/www.johneasley.com/gallery/albums/Underwater/Hawaiian_Cleaner_Wrasse_1.jpg