A skate is a ray. On the eastern seaboard of the US, Fishermen don't see a lot of use for them. the have sharp teeth and can bite through monofiliment. then you lose your rig.
They can also bite, then dive into the mud, makig it nearly impossbile to pull them up.
When we would pull them up, they normally became "free bait". slice them up, a free substitute for squid.
Commerical fisheries use skate meat for those little fish sticks and mystery seafood lumps you get in restaurants. If you get a dish called "Seafood chowder" or "Seafood casserole" it's likely to have skate and whatever else that has been ground up, pressed and turned into little "tater-tots of the sea".
A long time ago, we fished off of a bridge, near the ocean, usually for flounder or sea bass. We would fish the tides, sometimes in the evening into darkness, depending on the tides.
One time, this guy shows up on the bridge, with a bow, fitted with a fishing reel. He also had a spotlite. His buddy would search with the spolite, when they saw the shape of a skate, he would fire his rig into the water, and pulled up a few skates. I was about 14, in awe of this guy with his bow, skewering his prey.
To this day I wish we had asked him what the hell he did with the skates?
Maybe he needed some bait?