I think around 75-78 degrees. That was on bait though, specifically crabs. I seem to remember they shut off for the artis around these temps. Unless you have a lot of bait around. I got some nice ones around the last new moon. They were on the bottom feeding on the crabs. One of them was all red like it rubbed up all over the rocks getting those crabs. Tried plugs and bucktailing for no results. I have caught them in warmer water at montauk but that was when the water was loaded with bait, chock full of it. Otherwise they sit like logs on the bottom and in deeper water at the higher temperatures.