Thursday, December 14, 2017
News Roundup

Salmon migrate by truck during California drought

In drought-stricken California, young Chinook salmon are hitting the road, not the river, to get to the Pacific Ocean.

Millions of 6-month-old smolts are hitching rides in tanker trucks because California's historic drought has depleted rivers and streams, making the annual migration to the ocean too dangerous for juvenile salmon.

"The drought conditions have caused lower flows in the rivers (and) warmer water temperatures, and the fish that would normally be swimming down the rivers would be very susceptible to predation and thermal stress," said Kari Burr, fishery biologist with the Fishery Foundation of California.

California has been trucking hatchery-raised salmon for years to bypass river dams and giant pumps that funnel water to Southern California and Central Valley farms. But this year, state and federal wildlife agencies are trucking nearly 27 million smolts, about 50 percent more than normal, because of the drought, according to the California Department of Fish and Wildlife.

Each spring, the Coleman National Fish Hatchery usually releases about 12 million smolts into Battle Creek, a tributary of the Sacramento River near Redding. But this year, it trucked 7.5 million of them to San Francisco Bay because the drought had made the 300-mile swim too perilous.

On a recent morning, a small convoy of tanker trucks carrying Coleman hatchery fish pulled up to the docks of Mare Island north of San Francisco Bay. There, the trucks unloaded 750,000 smolts that gushed out of long plastic pipes into floating netted pens.

The silvery smolts, just inches long, acclimated to the water in the net pens before Fishery Foundation boats took them out to the bay, where the fish were released and pulled to the ocean by tides.

Trucking the smolts ensures that a large number will survive and grow to be the California king salmon prized by fishermen and seafood lovers. But skipping the river journey also means that the migratory fish won't know how to swim home to spawn in three years.

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