Sorry I don't know the latin names but goldfish are too fatty to be fed often, they zre part of the capr family which has lot of tham.... (sorry I don't know how to spell it). Also they have weak ammun systems and its said that some illness maybe possible to be transferred to turtles. I sure someone else will reply aswell. All turtles and any reptile for that matter will eat at every chance as much as possible, since in thw wild they don't know when there next meal is. But in captivity they don't figure that out so yes it can over eat.
Xavier