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The image displays the life cycle of salmon with illustrations and text for each stage. It begins with "1) egg," which occurs in the upper river spawning grounds, eggs buried in small nests, and takes 2-3 months. The next stage is "2) alevin," tiny salmon with egg sacs, which develops in the same location and takes 1-2 months. Then "3) fry" are depicted, small salmon with yolk sacs absorbed, 5cm in size, in the lower river growing grounds, taking 2-4 years. The stage of "4) smolt," salmon transitioning to salt water, is 15cm in length and is found in the open sea for 1-8 years. Finally, "5) adult salmon," which are 70-85cm in size, return to the upper river spawning grounds after 1-5 years in the open sea.
Given the complexity of the image, the above description may not be entirely accurate.
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The diagram illustrates the main stages that take place during the life cycle of the salmon.
Overall, there are three stages in this process, commencing with eggs being deposited in the upper river and finishing with the adult salmon carrying out their reproductive role.
Initially, salmon eggs are laid in the upper river where they are protected by surrounding reeds and small stones. The eggs then hatch into fry after approximately five to six months. Subsequently, these creatures with three to eight centimetres in length typically spend their next four years in the lower river with a faster flow.
The process continues with their transition into smolt, which are around 12 to 15 cm. Eventually, they migrate and live in the open sea for five years before reaching their maturity phase. Ranging from 70 to 76 cm, adult salmon fish then return to the upper river where eggs are deposited, thereby restarting the life cycle.
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