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Many fishermen think that representatives of the Salmonidae family are the only fish that inhabit seas, lakes and rivers. They are sure that there is nothing more there, except for the ichthyofauna. Fish is salmon, that’s it. Some people can be touched, when they hear this approach, others ridicule or…

Chondrostei, the subclass of Actinopterygii (ray-finned fishes), has already existed on the planet since the Paleozoic Era, so its modern representatives can be considered living dinosaurs for sure. (Penny Postcard: Columbia River Sturgeon, ca.1910. columbiariverimages.com) Representatives of Chondrostei existing nowadays can be up to 4.2 meters long (and according to…