Aquarius
Angler
I've read they are protected up in MA, but I wouldn't be sad if they are regulated in NY/NJ as well. I did a sundial catch/cook couple years ago...it was honestly one of the most delicious fish I've had locally, both raw and cooked. But I've heard stories of the bucket brigade stacking them up in NJ, which is a travesty.
This link is to the NOAA Federal Regs. If you read down, there is no retention of "Windowpane Flounder" in federal waters. There is nothing on the NYS DEC website about any restriction for Sundial (Windowpane Flounder) in NYS waters. Federal waters are beyond the 3 mile (cannon ball) line.
NOAA Federal Regs
Personally, I have not caught a sundial in a while. Years ago, I remember catching them frequently in the bay and ocean.
Another forgotten fish in our area. "4 Spot Flounder". They look very similar to our Fluke. They have a different looking tail, larger eyes and the distinctive 4 spots on the dark side. I caught several of them a few years ago. There is no limit on them. I didn't keep any since I figured the average DEC enforcement guy would think they were summer flounder and fine me. I read that they are good eating but have little market value as they are kind of small and thin. I do have some pictures and I will post if I can manage to find them.