Is sea slug a fish?

April 15, 2002
From: Stephaine

Dear Mr Rudman,
I wish to know whether a sea slug is a fish.

Stephaine, 2002 (Apr 15) Is sea slug a fish?. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from

Dear Stephaine,
Sea Slugs are specialised snails, and many of them, such as the nudibranchs, have 'lost' their shells. If you go to the What is a Slug? page you will find some information and links to other pages which discuss this topic.

Snails are molluscs, a Phylum of animals that also includes squid, octopus, and clams. Fish on the other hand are chordates (including vertebrates), a Phylum which includes all animals with a backbone - fish, frogs, birds, mammals etc.
Best wishes,
Bill Rudman

2002 (Apr 15). Comment on Is sea slug a fish? by Stephaine. [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from


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