Fish questions

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Offline DoctorBeaver

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Fish questions
« on: 14/03/2006 13:53:40 »
There's a certain type of flatfish (plaice?), 1 of the eyes of which goes for a walk around the fish's head. It starts off in 1 place and moves to another. How does that happen? Is it actually the eye moving or the head becoming deformed that gives the appearance that the eye is moving?

Secondly, some fish (and some cetaceans) can dive to incredible depths. Why doesn't the sea pressure flatten them? Is their internal pressure variable?

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ROBERT

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Re: Fish questions
« Reply #1 on: 14/03/2006 14:15:03 »
Quote
Originally posted by DoctorBeaver

 Is their internal pressure variable?
Quote

Yes, they have a gas bladder:-
http://en.wikipedia.org/wiki/Swim_bladder

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Offline DoctorBeaver

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Re: Fish questions
« Reply #2 on: 14/03/2006 14:51:51 »
quote:
Originally posted by ROBERT

Quote
Originally posted by DoctorBeaver

 Is their internal pressure variable?
Quote

Yes, they have a gas bladder:-
http://en.wikipedia.org/wiki/Swim_bladder



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