The head of a female longfin eel still living in its freshwater home is blunt with a bulbous dome behind the eyes. When the eel migrates to spawn in tropical sea water, the head becomes sleeker as muscle is lost. The eyes and pectoral fins also enlarge. The eel will not feed again, and dies after spawning.
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Natural Sciences Image Library of New Zealand
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Photograph by Peter E. Smith
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02 March 2012
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