Chelon labrosus is the only repressentative of genus Chelon I could find in Google Imagesearch. The picture and species information comes from a French-language website. This species is apparently native to coastal western Europe, from southern Sweden and Norway to Greece and Turkey.
These are mullets, an order of fish containing a single family. The taxonomy of this group of fishes is a little unstable, probably because not many people are working on them - a Web of Science search for "Mugiliformes" came up with 12 hits.