The pictures elucidate the metamorphosis of salmon, which is large fish.
Overall, the life of salmon fish entails three main stages: fry, smolt and lastly adult. The salmon have roughly a decade time period to survive where in lower river, open sea accompany by upper river.
The life cycle commences when salmon eggs are put into reeds where has also small stones. The current of river is slow enough to stay 5 to 6 months. Having hatched, same move towards lower river in which has fast-flowing pace. Meanwhile, the fish get another shape, fry(3 to 8 cm). This phase lasts about four years.
After leaving their half lifetime, the salmon fish transfer into open sea with bigger size. They are called smolt while being in the second phase which have 12 to 15 cm long body, spending their 5 years in open sea. Interestingly, they turn into adult salmon with 70 to 76 cm which is profoundly large. Having altered, they come back upper river. The last thing to note is that the cycle repeats itself over again.