The diagram below shows the life cycle of a species of large fish called the salmon. Summarize the information by selecting and reporting the main features and make comparisons where relevant.

The diagrams illustrate the life cycle of a

salmon

fish, highlighting three main stages: fry, smolt, and adult

salmon

.

Initially

,

salmon

eggs hatch in the upper

river

, a slow-moving water body with reeds and small stones.

This

stage lasts approximately 5-6 months, in which newly hatched fish, termed "fry", measure between 3-8 cm in length.

Subsequently

, the fry migrate to the lower

river

, characterized by faster-flowing water, where they continue to grow for about 4 years. During

this

period, they transition into the "smolt" stage, reaching a length of 12-15 cm. The smolts

then

travel towards the open sea. In the open sea, the

salmon

spend roughly 5 years maturing into adults, growing to a length of 70-76 cm. Once they reach full maturity, the adult

salmon

migrate back to the upper

river

to spawn, thereby completing their life cycle. In summary, the

salmon

's life cycle encompasses significant growth and development in various aquatic environments, from the upper

river

to the lower

river

and

finally

the open sea, before returning to their birthplace to reproduce.