Oxygen Concentration in water
As the warm weather of summer gives way to shorter days and cooler nights we can anticipate water temperatures to fall. Oxygen dissolves more readily in cold water than in hot so as the trout push the cooler water over their gills more oxygen passes into their blood. This increase in oxygen in the blood allows the trout to become more active as the oxygen and blood glucose combine to provide the energy for the muscles. So all us anglers look forward to a few weeks good fishing before winter sets in.
The graph below shows how dissolved oxygen changes with water temperature. A temperature fall from 22 to 8 deg. C (72 to 46 deg. F) gives a 24% rise in oxygen.
