Some deep sea fishes have swimbladders which function while they are young and inhabit the upper epipelagic zone, but they wither or fill with fat when the fish move down to their adult habitat.
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"' White marlin "'( " Kajikia albidus " ), also known as Atlantic white marlin, marlin, skilligalee, is a species of billfish that lives in the epipelagic zone of the tropical and subtropical Atlantic Ocean.
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"They spend most of their time in the epipelagic zone, the sunlit layer of the ocean within a few hundred feet of the surface, where their food is, " says Charles Mayo of Provincetown's Center for Coastal Studies.
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However, one individual has been videotaped west of Point Pinos, Monterey County, California, swimming below the surface in water deep; this and other observations suggest that this species makes periodic excursions away from shallow coastal habitats into the epipelagic zone.
