Nest digging behavior of rainbow trout (Salmo gairdneri)

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Abstract
A wild population of rainbow trout (Salmo gairdneri) was observed during spawning in the Lardeau River in southeastern British Columbia, in April and May in 1966 and 1967. Nest digging in the first few days of spawning in 1967 was predominantly nocturnal, but diurnal nest digging increased until activity was nearly steady around the clock.Rate of digging (digging bouts per 10-min interval) averaged near five before spawning, rose sharply immediately after spawning, and then decreased. The number of body flexures per bout of digging was near six before spawning, decreased sharply right after spawning, and then rose progressively over a 50-min period. Touching or feeling the bottom of the nest was frequent before spawning and decreased after. The effect of internal stimuli (egg release) and tactile stimuli on digging behavior is considered.

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