Fish can indeed get stuck in rock. Due to their streamlined and slimy bodies, fish can sometimes slip into crevices or small spaces between rocks. Once stuck, they may struggle to free themselves, which can lead to injury or even death. This is especially common for fish that live in rocky habitats or those that explore crevices for food or shelter. It is vital to provide fish with an environment that has the right balance of open spaces and hiding spots to prevent them from getting stuck. Regular maintenance and monitoring of the aquarium or pond can also help ensure the safety of the fish.