The diagram illustrates the life cycle of salmon, from spawning to their journey to the ocean. Summarise the information by selecting and reporting the main features and make comparisons where relevant.
The provided description outlines the distinct stages of the salmon's life cycle, commencing with spawning in freshwater rivers and culminating in their return to the ocean. Initially, adult salmon deposit eggs in river gravel, from which alevins hatch and remain hidden. Upon absorbing their yolk sacs, they emerge as fry, inhabiting the freshwater environment and feeding on aquatic insects. These develop into parr, characterised by vertical stripes, before undergoing a crucial physiological change called smoltification. This transformation readies them for a saltwater existence, and they then migrate downstream as smolts, often in groups, towards the open sea. The salmon spend several years, typically one to four, maturing in the ocean. Subsequently, they instinctively navigate back to their original spawning rivers to reproduce, thereby completing their life cycle and initiating the process anew.
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