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miniature versions of the adult eels. As the eel grows, it becomes known as a "yellow eel" due to the brownish-yellow colour of their sides and belly. After 5-20 years in fresh or brackish water, the eels become sexually mature, their eyes grow larger, their flanks become silver, and their bellies white in colour. In this stage, the eels are known as "silver eels", and they begin their migration back to the Sargasso Sea to spawn. Silvering is important in an eel's development because it allows for increased levels of the steroid hormone cortisol,

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