Fish stocking involves releasing fish into bodies of water to provide recreational fishing opportunities, rehabilitate degraded fish stocks, or restore species diversity. There are two main categories of fish stocking: put-grow-and-take stocking releases small fish that take time to grow to catchable size, while put-and-take stocking releases large fish that can be caught immediately. Problems with fish stocking can occur if too many fish of a target species are released, leading to overpopulation and competition for resources, or if an imbalance is created between populations of different fish species.