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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 have a system that uses "Accumulated Thermal Units" (ATU).
Simply put, 1 ATU is one degree 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 five C°, in 13 days we would have 65 ATUs.
Below is the table representing the different ATU and life stages for the various species.
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