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Associated Press
Young salmon that have been transported by tanker truck are loaded into a floating net at Mare Island, Calif., because of the worst drought that California has faced in 40 years.

Salmon migrate by truck

Worst California drought makes river trip hazardous

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

“Because that imprinting cycle is broken, it’s unlikely that many fish will make it back to Coleman. … They won’t find that scent to where home is,” said Scott Hamelberg, who manages the Coleman National Fish Hatchery.

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