There's a sub-genre of furries who are into anthro lizards and whatnot known as scalies; I'm not sure if there is an equivalent for anthro fish.
Though, scalies are still furries. Kinda like how if you live in the greater metropolitan area surrounding a large city, you can still say you live in that large city (ex. Someone living in Burnaby can validly say they live in Vancouver).
So basically, if it's an anthro animal of any kind, it's a furry ;)