Scales-less Fish Protection
Location: Outside U.S.
Date: Summer 2013
How do naked fish protect their bodies?
By secreting a mucoprotein slime coating over their skin which protects against invasive bacteria, parasites, and fungus. Also, scale-less fish have a quite tough outer skin composed of fibrous connective tissue.
Cowsar, John D Jr CIV (US)
Thanks for the question. I would think that the skin on scale-less or "naked" fish would be sufficiently tough in order to protect against abrasion and other mechanical damage.
I hope this helps. Please let me know if you have more questions.
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Update: November 2011