Video Camera on a Downrigger
You have to see this downrigger underwater viewing system that shows trout looking and striking a lure with no hooks in the lure.
What are downriggers? Downriggers are used to get the lure down to the depth that the fish are at. They consist of a 2 - 4 foot arm with a reel of stainless steel cable, an eight pound weight, and a release to hold the fishing line. The fishing line is hooked into the release and the weight is lowered to the fishing depth. The rod is placed into a rod holder and there is tension between the tip of the rod and the release causing a bend in the rod. When the fish hits the lure, it pulls the line from the release and the tension is removed causing the rod to snap up. This "tip up" signals a fish has hit the lure.
This type of video setup is great for viewing fish with or without downriggers. Check out this video and see how cool it is.

