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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 life cycle of the salmon, which involves three main stages occurring in different aquatic environments.
Initially, salmon eggs are laid in freshwater rivers, typically in areas with slow-moving current and gravel beds. After hatching, the young fish, called alevins, remain in the gravel and feed off their yolk sacs. As they grow into fry, they begin swimming freely and continue to develop.
In the next stage, the juvenile salmon, now known as smolts, migrate downstream into estuaries – where freshwater meets seawater. Here, they adapt to the saltwater environment and grow further.
Once mature, adult salmon enter the ocean, where they live and grow for several years. Eventually, they return to their original freshwater birthplace to spawn. After reproduction, many die, completing the life cycle.
Overall, the salmon’s development involves significant changes in both form and habitat, transitioning from rivers to the sea and back again.
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