The diagrams below show the life-cycle of a species of fish named salmon.The diagram includes the three main stages in the life of the fish and the three types of environment where they live.
After hatching from their eggs, newborn salmon fish-otherwise known as fry-spend around four years of their life in the lower part of rivers. Lower rivers contain fast flowing water.Upon spending four years in the lower river, salmon fish reach adolescence.
Adolescent salmon fish are named smolt. Smolt size varies from 12 to 15 centimeters.
Smolts migrate from rivers to open oceans, facing a significant adaption from freshwater to saltwater.Salmons live the open ocean for 5 years and become adults, raching the pinnacle of their physical development. After they have reach full maturity,salmon fish return to the rivers,though this time they reside at the upper river.Upper rivers have a less intense flow of water, making them a comfortable environment for laying eggs. Adult salmons stay in the upper river for around half a year. The upper river contains reeds and small stones that adults fish lay their eggs next to, creating a great shelter for safe hatching.
