The figures illustrate the life cycle of a large fish known as salmon. This process consists of three stages, during which the environment plays a significant role in each phase.
Initially, salmon eggs are laid among the small stones located beneath the reeds. These eggs are found in the upper river, where the water flows slowly. The incubation period for the eggs lasts approximately 5 to 6 months.
After this stage, the eggs hatch into salmon fry, which then migrate to lower rivers with faster currents. This part of their life cycle lasts about 4 years, during which they grow into smolts measuring 12 to 15 cm in length. Following this, the smolts move to the open sea, where they remain for about 5 years until they reach adulthood.
Finally, adult salmon, which typically grow to around 76 cm, return to their spawning grounds to lay their eggs under the reeds, among the small stones.