Do all fish have scales?
No, some like catfish and bullheads, have smooth skins.
No, many fish are scaleless such as the catfish family, eel family, and
no dear ...even fishes often have scales, gills and fins...
some have not...for example some of them instead
of scales have a very hard skin...
an thanks for asking NEWTON!
(Dr. Mabel Rodrigues)
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Update: June 2012