Fish That Do Not Have Scales

Catfish are bottom-dwelling fish that typically have smooth skin without scales, often covered in a mucous layer.

Eels, such as the American eel and moray eel, have long, slender bodies covered in smooth skin, lacking traditional fish scales.

Lungfish are unique freshwater fish that have a smooth, slimy texture and can breathe air, and they do not possess scales.

Hagfish are jawless fish known for their eel-like appearance and are completely scaleless, with a slimy, mucus-covered skin.

Lampreys are also jawless fish, characterised by their smooth skin and lack of scales, often parasitic in nature.