The diagram shows the life circle of a salmon

The diagrams simulate a natural circular process in which salmon mature from jelly-like eggs to fully grown salmon. Overall, salmon experience significant changes, in which there are two main stages: growing up and completing maturation to spawn. As observed, the female salmon chooses the best spot to lay a massive number of eggs, then incubated for about three months. These eggs hatch into alevin, which feeds on yolk-sac for several weeks before turning into fry. Once fry is about several months old, they grow up and develop "finger" markings, becoming parr. Having reached the age of one to three, they become smolt, forming into groups and heading out to explore the sea, turning to adults. By the time adult salmon have spent one to eight years at sea, the spawning process will start as long as optimal conditions.