Is a mermaids hair long

They can have hair of any type and color it depends on what the artist or writer wants them to look like. Since they are not real they can be anything. <- this is wrong.

No mermaids do not have hair. Mermaids actually lost there hair when they evolved into mermaids. Hair slows a creature down that is trying to swim. So through evolution these mermaids lose there hair. In conclusion, no mermaids do not have long hair. They have no hair at all.