440mya Actinopterygii

RAY FINNED FISH, EELS, SEA HORSES, MUDSKIPPERS.
Ray-finned fishes which includes sturgeon, paddlefish, eel, herring, carp, salmon, trout, seahorse, cod, etc. are part of the bony fish. Of all ray-finned fishes, most belong to the large infraclass teleostei.
Some teleost fishes evolved unfishy shapes to cope with their chosen ecological niches. The leafy sea dragon, for instance, abandons the typical streamline fish shape which works so well for the majority of fishes. Instead, it adopts a leafy shape to hang motionless in kelp forest, pretending to be a piece of seaweed. The razorfish takes up an elongated, laterally compressed body, together with a long, flattened snout. It swims in a head-down vertical stance, allowing it to hide amongst tall spines of a sea urchin. The snipe eel is ridiculously thin, while the gulper eel sports jaws which look disproportionally large for its body. Lastly, the ocean sunfish resembles a huge, two-ton disc or millstone, as its Latin name, Mola mola, suggests.
Contrary to common assumptions, swim bladder is not a precursor to lungs in human and other lobe-finned fishes. Instead, the bony fish ancestor possessed a primitive lung which was co-opted by teleost fishes for buoyancy control, and in some cases as ear drum for hearing. The teleost fishes rely on gills for breathing underwater. They repurposed the primitive lung, turning its ability to absorb from and release gas into the blood stream into a volume-changing mechanism, thus allowing teleost fishes to move vertically in a water column without the use of fins.

When we decry the bush meat trade where wild game is hunted and killed for human consumption, rarely do we think of fish.  There is a premium on 'wild caught' fish now that fish farming is supplying a considerable proportion of seafood protein.  But the factory trawlers that sieve every living creature out of the ocean leaving a trail of death and destruction are overfishing the oceans and stocks are being depleted faster than they can recover.  Eastern Canada witnessed the collapse of the cod fish industry which has not yet recovered even after 30 years of fishing bans and will take at least another decade before sustainable harvesting can be instituted.  That story has been repeated around the world to different species of fish.