Baby salmon emerge from gravel earlier and less developed when temperatures are warmer

A new series of laboratory experiments on Chinook salmon reveals the effect of warmer freshwater on the time from egg hatching to emergence from gravel as fry. Warmer water resulted in fry emerging two and a half months earlier than those exposed to cooler water, after accounting for genetic differences among eggs produced by different combinations of parental fish. The newly emerged fry were also less developed on emergence when exposed to warm water. The new research was conducted as part of a MS degree in SAFS by Abby Fuhrman and other researchers at the Northwest Fisheries Science Center and US Forest Service, and SAFS professor Graham Young. It was published in the journal Ecology of Freshwater Fish.

Salmon fry were more likely to emerge at development stages 1 and 2 when raised under warmer water, but at development stages 4 and 5 when raised under cooler water.
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