Not all fish have thin, soft skin without scales or hair. While many fish species, such as catfish and eels, have smooth, scaleless skin, others are covered in scales that provide protection. Additionally, some fish have a tough outer layer or skin adaptations that serve various purposes. Therefore, the characteristics of fish skin can vary significantly among different species.
No just skin and hair. Animals like fish, snakes and alligators have scales
Most probably, their scales is like our skin. They breathe through their gills not their scales.
Fur/hair over Skin and Lungs
No: fish have scales, not skin, unlike reptiles which have scaly skin (there is a difference).
There is no real type of skin for cartilage fish. It varies..
yes iguanas have scaly skin. An Iguanas' skin is rough and coarse similar to dry fish scales
They have skin [its octopuses or octopi]
Most fish do in fact have scales, even some with scales that are nearly microscopic in size; many catfish however do not have scales, they have armour plating, but not scales.
No. Mammals do not have scales. Mammals have skin and hair. Some mammals feature scaly skin on some of their body parts such as their legs, but these are by no means scales. In the case of some animals, what may appear to be scales are in fact modified hairs. The pangolin is an example of this. Its scaly plates, like the scaly skin of reptiles, are made of keratin. Note that reptiles also do not have scales - just scaly skin. The only vertebrates with true scales are fish.
Scales.
A fish has scales
Reptiles have scales on their skin while mammals have hair on their skin.