Dark Sharks represent the other side of the Kitefin family tree evolving from the Sharkopath reaching lengths of 14 feet Dark Sharks hunt excessively in dark water either at great depths or in the dark of the night. Dark sharks aren’t adept at tackling large filter feeders like Gulpers and the role of the large game hunter is taken by related Speckle Shark’s.
Dark Sharks primarily hunt schools of smaller prey like deep-water fish and cephalopods that come to the surface at night. Like Sharkopath's Dark Sharks communicate via their bioluminescent stripes often being the only part of them visible in the gloom of the night. Their stripes alternate in flashes of yellows, oranges, and greens and are used like the colorful sails of swordfish to avoid colliding or biting each other in low light visibility they hunt in.
Dark sharks thus have especially good close-range among fish with a Tapetum Lucidum extremely good at reflecting light and seeing in dim light. The downside is that Dark sharks are extremely near sited as they only need to see things close to their eyes and can only see clearly about 20 feet in front of them and rely on their other senses for finding things at long ranges.
The only animals with better vision are Blish who by the necessity of flight have excellent vision both near and far-sighted and Tera Squids whose Cephalopod eyes and ability to filter light through their unique pupal shape give them even better vision then vertebrates.