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

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

salmon

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.

Initially

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,

salmon

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eggs hatch in the upper

river

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

This

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

Subsequently

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, the fry migrate to the lower

river

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

this

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

then

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

salmon

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

salmon

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migrate back to the upper

river

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

salmon

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

river

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to the lower

river

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and

finally

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