The diagram illustrates the life cycle of a salmon, a species of large fish.
Overall, the life cycle involves three stages: fry, smolt, and adult salmon detailing its growth and movement in aquatic environments.
The cycle begins in upper river, where salmon lay eggs among reeds and small shores in a slow-moving water. They stay approximately 2 to 4 months before hatching into fry in a lower river with fast-flowing water. On this process, eggs are hatched becoming a young salmon, measuring just 3 to 8 cm in size and take approximately four years, growing to smolt stage. At this point, they undergo physical and physiological changes before migrating to the ocean, measured between 12 to 15 cm.
Eventually, once the juvenile salmons are fully grown, they can travel great distances to open sea over the span of five years, measuring 70-76 cm in size. After spending several years, adult salmons swim back to their original place to mate to produce offspring and lay new eggs, completing the cycle.