Is it permissible to eat fish that live in artificial ponds and feed on the remains of dead and impure animals?

It is permissible to eat fish if its food is predominantly pure. However, if it feeds on impurities (Jallalah), it is not permissible to eat it until it has been confined for three days or more and fed with pure food, so that its flesh becomes good and the effect of impurity is removed, due to the Hadith prohibiting Jallalah. If it becomes clear that consuming such fish causes harm, then it is not permissible to consume them.