There are many ways in which scales assist a fish. The easiest one to explain and probably the most accurate to answer your question is that the scales are smooth and provide an aerodynamic facade, which helps them swim more efficiently.
the scientifical function of scales on fish is to weigh the fish. If the fish is really fat, it has more scales because there is more weight. Some fat fish lose their scales though because they are self-conscious of their weight.
there not scales there solar panels
Cuz they DO!
Scales
Scales can help to protect a fish and make it more comfortable when it swims or moves around; scales are typically hard, sturdy, and slippery which can also make it more difficult for predators to catch it.
Protection,swim better, waterproof
Scales help to protect the fishes body. They also help the fish be able to glide through the water.
to help the fish swim and float
tough scales
Because if fish had fur then the fur would get wet and weigh them down and they wouldn't be able to swim very well. Scales help them move swiftly in the water and give them an armor-like outer covering.
Some of the adaptations that allow fish to live in the water are gills, fins, and scales. The gills allow the fish to live in the water. The gills allow the fish to extract oxygen from the water. The fins allow the fish to swim through the water and help it stear itself. For the scales I'm not sure!
Fins on a fish is what fish use to swim around, normally there would be three fins, one at the top and one on each side of the body. Scales would normally be on the body, to keep it secure. The sizes can be different, but it depends on the size of the fish. A big fish would have big scales and a small fish would have small scales.
it help the fish to move swiftly threw the water
help the fish breathe