The diagram below shows the life cycle of a species of large fish called the salmon

The diagram illustrates the life cycle of a particular fish, which is

salmon

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.

Overall

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, there are several different stages from being an egg to reaching adulthood in the open sea, which varies in size and occurs in three distinct environments.

Firstly

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, the

salmon

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eggs reside in the upper river that has slow-moving water for around five to six months, the eggs lie under the reeds and are covered by small stones.

Secondly

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, they hatch and are called fry, which

measure

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3 to 8 centimetres long, staying in the lower river with fast-movement currents for approximately four years before moving to the open sea.

Thirdly

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, they turn into a smolt

that is

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12 to 15 centimetres, which is generally larger. The smolt migrates to the open sea where they live for about five years until they mature into adult

salmon

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that reach a size of 70 to 78 centimetres long.

Lastly

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, the adult

salmon

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return to the upper river to reproduce the

salmon

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eggs.

This

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life cycle will be repeated continuously from phase one to three, from spawning to maturating.