The diagrams below show the life cycle o f a species o f large fish called the salmon. Summarise the inform ation by selecting and reporting the main features, and make com parisons where relevant

Salmon

begin life as eggs on a pebbly riverbed, hidden among reeds in the slow-moving upper reaches of a river. After five to six months the eggs hatch into ‘fry’.For approximately the next four years, these baby

salmon

will live in the lower,faster-flowing waters of their river. During

this

time they measure between

threeand

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three and

eight centimetres in length. By the time

salmon

reach twelve to fifteen centimetres, they are termed ‘smolt1, and at

this

time they migrate

further

downriver into the open sea. After five years at

sea

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sea,

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the

salmon

will have grown to adult size, which is between seventy and seventy-six centimetres. They

then

begin swimming back to their birthplace, where they will lay their eggs

,

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and the cycle starts anew. In summary, the

salmon

passes through three distinct physical stages as it grows to maturity. Each of these stages takes place in a very different aquatic location. It is noteworthy that the first two stages of

this

fish's life occur in a freshwater environment,

while

the third stage is lived in saltwater.