The provided illustration offers insights into the life cycle of a specific large species known as the salmon.
Overall, it is quite evident that the salmon fish moves to a new home at each stage of her life. The cyclical process begins in the upper river, then it moves down to the lower river. Last before coming back to the initial location in order to reproduce, it lives in the open sea.
To commence, the salmon fish lay their eggs in the slow moving water of the upper river. Right at the base, where reeds and small stones provide a shelter to the eggs for approximately 5-6 months. Then, once a fry is about 3-8 cm in length, it moves to the lower river or to the estuary. It remains in the fast flowing water for nearly 4 years. Following this a smolt, which measure 12-15 cm migrates to the open sea water, where it stays there for around 5 years. After that, it goes through the adulthood, at this stage an adult salmon is around 70-76 cm. Last, the urge of reproduction pushes the senior fish to go back to the initial environment, and that culminates in restarting its life cycle again.