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.

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  • 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.
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  • 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.
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  • Accumulated thermal unit
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