Your question is kind of a flipped version of my experience. I stocked 50 RBT in my pond last October. Did not feed them anything because I wanted them to hammer the small fish that I didn't want. They did that and in the spring I started to feed them. Saw exceptional growth. 11" stock grew to 15-17". Most that I pulled out in June before they died from the heat were pushing 3#. Now how does this relate to you.... I caught one just a little while ago that happened to live thru the summer. Hadn't been eating much due to staying where the water was cooler. In that two month span, I figure it lost about a pound in weight because it was just under 2#. A big loss in my opinion. So, I think it would be like CJ says, keep track of the current weights of ones caught, and if you start seeing a decrease in weights, you better start feeding again.
