Silver perch are not as popular as some of the other bait fish, but they can be productive baits for grouper, snapper and other bottom fish. Adult fish are usually around 6 to 8 inches long, but they can get up to around a foot long. They eat small fish and crustaceans. You can catch them similar to how you would catch pinfish. Tiny pieces of cut bait and shrimp will get the job done.