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Goo gives eels just the right buoyancy

Scientists survey the specific gravity of 25 marine critters

Getting stats on elusive glass eel larvae has always been a slippery task. The young eels consist mostly of a jellylike matrix covered by a thin sheath of muscle, making them completely transparent. In fact, for centuries scientists thought that the young eels — called leptocephali — were a separate species of fish from the more solid-bodied adults.

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