What specific water temperature typically limits where bull trout can successfully spawn and rear young?

Answer

Below 55 degrees Fahrenheit

The successful spawning and rearing of bull trout are critically dependent on maintaining consistently cold water temperatures, a specific environmental requirement noted as typically being below 55 degrees Fahrenheit. This temperature threshold dictates the geographic areas where the species can complete its life cycle, particularly the incubation period for eggs and the early development of the young fish. When water temperatures exceed this limit, the physiological requirements for survival are unmet, which limits their distribution to colder headwater streams and high-elevation areas. This strict thermal niche makes the species highly vulnerable to warming trends or increased ambient temperatures caused by environmental changes throughout the watershed.

What specific water temperature typically limits where bull trout can successfully spawn and rear young?

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