The SeaQualizer is a pressure activated decompression tool designed as an alternative method to venting. The SeaQualizer descending device is recommended when fishing at depth that any fish returned should be released at between 1/3 to 1/2 the depth they were caught at. Once you choose your release depth attach the SeaQualizer to your fishes bottom lip and slowly send the fish back down. Once the SeaQualizer reaches set depth the jaws pop open allowing the fish to return itself to the bottom. This descending device is completely non-invasive for the fish.