Most fish that suffer from bloat die pretty quickly. And the most common sign of bloat is the fish blows up like a balloon, so not likely to be that. And bloat isn't a real issue in predators. It is common in vegetarian fishes that get fed meat foods. The vege fish have a long digestive tract to process the plant matter and if they ingest meat it can rot while being digested and that causes them to bloat. Carnivores have a shorter digestive tract and the meat spends less time inside them so is less likely to cause a problem.
If they are small fish then just try increasing the feeding regime.