Life stage of an eel. From top to bottom : glass eels (source Bournemouth Global Environmental Solutions) when they reach the coast; elver of A. mossambica as they migrate up the rivers, A. mossambica ‘yellow eel’ stage when they live in freshwater; A. mossambica ‘silver eel’ when they transform (bright white/silver coloration and big eyes) before they migrate back to the sea.
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