Wednesday September 9, 2026
Active NorCal —
Some of the best salmon habitat in California isn’t a wild river at all. It’s a rice field outside Sacramento in the dead of winter.
Research from the UC Davis Center for Watershed Sciences has shown that when Central Valley rice fields flood after harvest, they transform into an all-you-can-eat buffet for baby salmon. The shallow, sun-warmed water and decomposing rice straw produce staggering amounts of zooplankton, in some measurements 53 to 150 times more than the adjacent Sacramento River channel.
Juvenile Chinook released onto those flooded fields grow two to five times faster than fish confined to the river, posting some of the fastest freshwater growth rates ever recorded in California. Bigger juveniles become stronger smolts, and stronger smolts are far more likely to survive the gauntlet of the Delta and the open Pacific.
The science essentially recreates something the Valley lost. Before levees walled off the Sacramento River starting in the late 1800s, winter floods spread across the floodplain every year, and young salmon fattened up in those food-rich shallows before heading out to sea.