My RES turtles stopped eating.....?

I have 3 RES turtles, all 3 are very healthy. i put about thirty small goldfish in their tanks so they could have some fun and chase them around and eat them. the first couple of nights i saw the numbers of the fish deplete, and now a week later the same amount of goldfish remain. why have they stopped eating them?? did they make peace with them? or just get tired of eating them?