Sharks are more closely related to skates than to sea trout.
This is because sharks do not have true bones in their body. Another difference from typical finfish is that sharks lack an air-filled swim bladder, and hence, most sharks must keep swimming to keep from sinking. What also sets the shark apart from typical finfish is its five or more gill openings, uneven tail, and tooth-like scales. The mako shark is one of the most popular sharks in Mid-Atlantic markets. This species is deep blue-gray above, changing along the sides to a snowy white belly.