Is a goldfish an exoskeleton

No, a goldfish is not an exoskeleton; it is a vertebrate with an internal skeleton made of bones. Goldfish belong to the class Actinopterygii, which are bony fish. An exoskeleton is a hard outer structure that provides support and protection, typically found in invertebrates like insects and crustaceans. Goldfish have scales covering their bodies, which are part of their skin rather than an exoskeleton.