username2889812
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I mean they move a lot right? So ventilation could be similar to cartilaginous fish?
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idk01
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They aren't usually required but without them, they wouldn't be able to breathe when not moving (they do sometimes stop swimming)
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#3
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(Original post by idk01)
They aren't usually required but without them, they wouldn't be able to breathe when not moving (they do sometimes stop swimming)
Ooh I see...that would mean they are less active than cartilaginous fish no? :hmmmm:
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_.angelica._
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Ram ventilation has leads to less efficient gaseous exchange. Bony fish use the operculum in conjunction with the ‘countercurrent flow’ method where the water with a high oxygen concentration flows next to blood with a relatively low concentration, so there is a net movement of oxygen into the blood.

Also ram ventilation is a fairly older method of ventilation and bony fish have evolved to adopt this method instead, so by evolutionary terms the whole gill operculum thing seems to be much better.
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username2889812
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#5
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(Original post by _.angelica._)
Ram ventilation has leads to less efficient gaseous exchange. Bony fish use the operculum in conjunction with the ‘countercurrent flow’ method where the water with a high oxygen concentration flows next to blood with a relatively low concentration, so there is a net movement of oxygen into the blood.

Also ram ventilation is a fairly older method of ventilation and bony fish have evolved to adopt this method instead, so by evolutionary terms the whole gill operculum thing seems to be much better.
:ta:
So I take it cartilaginous fish still live by ram ventilation?
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_.angelica._
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Yes, and no problem
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