I use it to pull in bait when I am anchored at night. I can say it does attract the baitfish and get them active. I have a light on both ends of my boat and when I turn on the hydrowave 90% of the bait moves to the front of the boat where the speaker is. The bait is also much thicker when I turn it on. I can't say with any certainty that it helps me catch more fish or not.