these are the gills of a slow-going rather than an active fish. The scales are hard, woven tight as armor, and rough to the touch. The roughness comes from tiny, tooth-like spikes called denticles ...

They have gills that allow them to breathe underwater. Surprisingly most fish lay eggs. Not hard like a chicken, but soft and lots of them. Fish all have scales, even when they're newborn and tiny.

"Cleaning" a fish involves disposing of the gills, blood, and guts, along with the animal's skin and scales. Descaling is not absolutely necessary, and many cuisines the world over serve fish ...

Gills and mammalian ears bear little resemblance ... did in a tour-de-force comparative genomic study that included a fish, an amphibian, a reptile, a mammal and even a horseshoe crab (Limulus ...