US Patent 7114286 System for reducing the number of predator fish

The system includes a capsule member made from a material which is not dissolvable in water but is dissolvable in the digestive fluids of a predator species. The capsule contains a material which, following ingestion by a predator (game/sport) species, results in death of the predator species. A connecting member is secured to the capsule, and is adapted to be secured to a prey (bait) species such that when the prey species is released in a body of water, such as a lake, in the vicinity of the predator species, the predator species is likely to consume the prey species along with the capsule and shortly thereafter dies, thereby reducing the number of predator species.