High water temperatures stress aquatic ecosystems by reducing the ability of water to hold essential dissolved gasses like oxygen.
Why Temperature Is Important
Human activities should not change water temperatures beyond natural seasonal fluctuations. To do so could disrupt aquatic ecosystems. What constitutes a good temperature depends on the type of stream you are monitoring. Lowland streams, known as "warm water" streams, are different from mountain or spring-fed streams that are normally cool.
In a warm water stream, temperatures should not exceed 89 degrees (Fahrenheit). Cold water streams should not exceed 68 degrees (Fahrenheit). Often, summer heat can cause fish kills in ponds because high temperatures reduce available oxygen in the water.
See this link for information about temperature testing equipment (thermometers).
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