The diagram illustrates the cycle of salmon comprising two parts which are in a river and open sea.
Overall, it is clear that the cycle of fish species starts with the emergence of young salmon and ends with adult ones travelling back to their place to lay their eggs.
To begin with, eggs are laying on small gravels surrounded by reeds in an upper river which has a low current. These eggs take approximately five to six months before hatching baby salmons so-called fry (3-8 centimetre long). They will now move to a lower river which has fast flowing as well as staying and growing in this area for around 4 years. After several years, The frys now grow into smolts which have a total length roughly at 12-15 centimetres and get ready to change their location from fresh water to salt water.
Furthermore, after the smolts relocate to the open sea, they will need to live and survive for about 5 years before they turn into adult ones which have a length of 70-76 cm. After living in the sea for a while, they will return to their birthplace again to mate and lay their eggs. Additionally, this cycle will be repeated all over again.
