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How do surface dwelling deep sea fish (such as Tuna) sense that they are in

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Old 11-28-2007, 06:50 PM
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Default How do surface dwelling deep sea fish (such as Tuna) sense that they are in

deep water? Since they seem to spend their time at the surface, it begs the quesion of how they know the water is deep below them. Do they have some sort of depth sensing system? Acoustic? Visual? Other?
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