Accumulated thermal unit

Accumulated thermal unit

An Accumulated Thermal Unit is a unit of measurement used to describe heat over a period of time in a cumulative fashion.

Incubating salmonid eggs not only develop over time but also according to temperature. Eggs incubated at 10°C develop twice as fast as eggs incubated at 5°C. To keep track of the development within an egg, scientists use Accumulated Thermal Units.

1 ATU is equal to one degree Celsius for one day. In water of 10°C, we would accumulate 10 ATU per day; after 13 days we would have 130 ATUs. If the water was at 5°C, after 13 days we would have 65 ATUs.

External links

*http://www.metroeastanglers.com/atu.html – A listing of predicted ATU's and an ATU Calculator


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