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How Do Fish Act in Dissolved Oxygen
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How Do Fish Act in Dissolved Oxygen
Algae use up large amounts of oxygen. This leaves less oxygen for the fish to breathe. This decrease in oxygen can create areas where the oxygen levels are so low that marine life cannot survive, creating dead zones.
Fish need to breathe, and they breathe oxygen that is dissolved in the water. When it rains fertilizers from farms and yards, sewage from waste treatment plants or run off from washing cars eventually makes it out to the ocean. So when all of these extra nutrients are washed into the local river by the rainfall, and the river flows out to the sea, it brings with it such a large concentration of nutrients that the algae grows out of control.
http://www.depi.vic.gov.au/fishing-and-hunting/fisheries/recreational-fishing-grants-program/your-licence-fees-at-work-2011-12/determining-the-extent-of-summer-trout-habitat-in-lake-hume-and-lake-dartmouth
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We can use Henry's Law to calculate the concentration of dissolved carbon dioxide in an aqueous
solution.
Henry's Gas Law
As temperature increases, the amount of dissolved gas decreases.
Example 1.
P=KC
P=Pressure of the gas (atm)
K=Henry's Law Constant (atm/M)
C=Concentration of the Gas (M)
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Shaded sections indicate suitable fish habitat; unshaded sections indicate unsuitable fish habitat where the water temperature was too high and/or dissolved oxygen concentrations were too low. Fish, crabs, and oysters that live or feed along the bottom require dissolved oxygen concentration of 3mg/L or more.
Fish in Dissolved Oxygen
Dissolved oxygen is the oxygen that is present in the water - measured in milligrams per liter (mg|L)
Fish "breathe" oxygen just as land animals do. Fish are able to absorb oxygen directly from the water into their bloodstream using gills, where the land animals use lungs to absorb oxygen from the atmosphere.