Goldfish and koi will often relish the soft fleshy insides of oranges. They will leave the rind. Depending on the ferocity and scrutiny of your fish, he may eat a lot of the orange or he may not care so much for it.In other words, it's safe for you to try, but there are no guarantees that your little guy will take to it immediately.
Goldfish usually only eat the fluid filled sac part of the orange. They eat this part primarily because the rest of the orange is relatively hard for them to bite off. Some more adventurous goldfish may try tasting the part between the carpel and rind but do not care for it much.
In addition to the regular pellets or flakes, which should be pre-soaked, as a treat 2-4 times a week in lieu of the fish pellets or flakes, you can give them a wide variety of fruits, vegetables and protein-based treats such as brine shrimp, daphnia, bloodworms, tubifex worms, insect larvae, krill plankton, chopped earthworms carefully selected from your yard where no pesticides or fertilizers are used and chopped cooked eggs.
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