What organs or modifications would be needed to have hairy fish?

I mean fish (not necessary to be a trout), not aquatic mammals, and real fur, not from fungi or mold (or looks like fur because of the dead cell, like Mirapinna esau).

What kind of organs are needed, so a fish can have/grow fur (I assumed the fur probably is waterproof, but correct me if such thing will hinder the fish) either combine with/on the fish scale? Can this hinder their hydrodynamic or gills to breathe?

Since it grows hair, I assume the fish probably live in a cold climate, but I am also curious if this kind of fish can live in other climates or not.

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What organs or modifications would be needed to have hairy fish?

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