I am trying to create a larval fish growth model for a class project and incorporate percent oxygen saturation into the metabolism component. I have found many references about oxygen uptake and metabolism, but I am having trouble finding a formula for the effect of oxygen concentration on oxygen uptake. It is only a class project, so I am not overly worried about accuracy of the formula, but a multi-species study from a respected researcher would be nice. It seems there should be a relatively simple relationship.
Hi Jason,
do you need the relationship between the O2 concentration in the water and the O2 uptake by the fish?
If that's the case you simply have to look at the saturation curve of haemoglobine. There is a sigmoidal characteristic.
If you're searching for a relationship between the O2 concentration in the water and the total O2 consumption by the fish, it should be a saturation curve too, but different. ;) You can look this (including usable formula for a non-linear regression) up here (including usable formula for a non-linear regression) http://jeb.biologists.org/cgi/doi/10.1242/jeb.085712.
Or you take a look at the publications by Peter J. Rombough.
Cheers,
Chris
I appreciate the response and will check those references. I am basically looking at how oxygen concentration might affect larval fish growth energetics. It seems the DO would need to be pretty low to have a large impact on larval growth. I don't understand the difference between O2 uptake and total O2 consumption. Would uptake be the amount taken in, and consumption be the amount used in metabolism? In other words, the organisms often have an excess of oxygen? Thanks.
Well, when you check the linked reference you will see that the oxygen partialpressure (PO2) at witch it should affects larval growth has actually a name. Mostly it's called critical oxygen partialpressure (Pcrit) and is the PO2 at which the aerobic metabolism is no longer possible. The difference between uptake and consumption is just the haemoglobine. So the curves look different. I guess fish have only an excess of oxygen when the PO2 in the water is pretty high.
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