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Name: Lisa C.
Status: other
Age: 30s
Location: N/A
Country: N/A
Date: 4/10/2003


Question:
Why do fish die in different oxygen levels of water? I am having a hard time finding out where we need to look for the research part and if there is a book or web site out there where we can find this information out. Could you please help?



Replies:
The gills of a fish are not all that different form our lungs. The basic principle is that their needs to be enough dissolved oxygen in the water to favor diffusion of oxygen from the water through the gills into the blood of the fish. When the oxygen falls below a certain level this passive diffusion fails to be able to drive the oxygen into he blood and the fish suffocates much like a mammal might at the top of mount Everest.

Peter Faletra


You will probably find it useful to look in an advanced (e.g., college level) general chemistry text for the relationship between dissolved oxygen levels and temperature. At higher temps, there is less oxygen dissolved in the water.

Paul Mahoney, PhD


This web site may be of some help.

http://www.fisheriesmanagement.co.uk/Fish%20Studies/bloodflow_countercurren t.htm

J. Elliott


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