Fish

Fish or as it has been scientifically known as Pisces are cold-blooded vertebrates, which are covered in scales and have fins as their limbs for locomotion underwater. They live in both salt and fresh water. Some fish have adapted to move on land, but as long as their skin is keep wet. Fish range from tiny, primitive Haikouichthys to huge Dunkleosteus. Fish, in general are oldest type of vertebrates known to this day (and also the first who had copulative sexual reproduction with each other) and some (the lobe-finned fish) have developed into a another group of animals know as amphibians, who were first vertebrae to live on land even if only partially. (For their own part, the fish probably ha ve evolved from the boneless, conodont-like creatures similar both to the modern lancelet and to the Cambian Haikouitchthys.)

The following fish have appeared in Impossible Pictures works:

- Jawless fish (agnaths): Cambrian - Haikouichthys (Walking with Monsters); Ordovician - a nameless dead jawless fish (Sea Monsters); Silurian - Cephalaspis (Walking with Monsters); Devonian - Bothriolepis (Sea Monsters)

- Cartilaginous fish (sharks and rays): Devonian - Stethacanthus (Sea Monsters, Walking with Monsters); Jurassic - Hybodus (Walking with Dinosaurs, Sea Monsters); Cretaceous - an unidentified shark (Sea monsters); Eocene -Physogaleus (Walking with Beasts); Pliocene - Megalodon (Sea Monsters); Modern times/The future - a future shark (Primeval)

- Teleost fish (ray-finned fish): Devonian - Dunkleosteus  (Sea Monsters); Jurassic - unidentified bony fish (Walking with Dinosaurs), Leedsichthys (Sea Monsters); Cretaceous - Xiphactinus (Sea M onsters);   Eocene - unidentified bony fish (Walking with Beasts) unidentified bony fish (Walking With Cavemen)

- Teleost fish (lobe-finned fish): Devonian - Hyneria (Walking with monsters); Triassic - unidentified lungfish (Walking with Dinosaurs)