* Fish: Yes, perch can be kept in an aquarium. They are popular freshwater fish that can be kept in a community tank with other peaceful fish. However, they need a large enough tank and specific water parameters to thrive.
* Birds: No, perch (referring to birds) cannot be kept in a tank. They are active, flying creatures that require a spacious cage or aviary to fly and exercise.
Therefore, to answer your question accurately, you need to specify if you are referring to fish or birds.
If you're interested in keeping fish, let me know, and I can provide some information about the care requirements for perch in an aquarium.