true back when i was a helper on a striper guide boat in the 80s when the bite slowed down the guide would take his fish knocker and tap on the stern wheel and the bite would start to pick up so yes it will work but for crappie never heard of working or ante other fish but the striper and hybrids ever seen a ted Williams fish caller put out by sears back in late 60s early 70s maybe they really did work lol