A state partnership with a hatchery is promising great benefits to the salmon, as reported by this article from the Cal Sportsman Magazine.
California may have experienced record rainfalls this past winter, but negative impacts due to the unprecedented five-year statewide drought continue for Chinook salmon produced at the Coleman National Fish Hatchery.
In a unique partnership that hasn’t been utilized in 40 years, the state of California has stepped in to help out.
The Coleman hatchery, located in Anderson, California is the only federally operated fish hatchery in the state with an annual production of 12 million fall-run salmon smolts that are typically released into nearby Battle Creek each spring. This allows them to complete the imprinting cycle during their outmigration to the ocean.
In 2014 and 2015 however, due to extreme drought conditions which prevented release into Battle Creek, most of those 24 million fish were driven almost 200 miles by truck (about 280 river miles) and released into locations near the San Francisco Bay, including Rio Vista, Mare Island and San Pablo Bay.
As a result, a good portion of the Chinook salmon smolts that were released in 2014 – about 8 million of the 12 million were trucked that year — strayed off course when they returned to freshwater to spawn. In 2015, poor conditions persisted and all 12 million of those smolts ended up being trucked. These fish are returning to spawn primarily during the current year.
California Department of Fish and Wildlife’s Nimbus Hatchery, located near Sacramento on the American River, opened its fish ladder early on Oct. 9 to accommodate the arrival of those straying fish. Beginning Oct. 10, twice a week, on Mondays and Thursdays, hatchery workers from Coleman arrived in Sacramento to help CDFW spawn fish that originated in Battle Creek.
The eggs collected at Nimbus will be returned to Coleman to prepare for the planned spring release, to help augment what could be the lowest Chinook salmon return ever, said Brett Galyean, project leader for the Coleman hatchery complex.
In typical years, Coleman will see a return of around 30,000 fish and since 1996, as many as almost 143,000.
This year, however because of the drought-caused trucking, only about 3,000 are expected to return to Battle Creek.
“It’s pretty spectacular the way the state has stepped up to help us out,” said Galyean, adding that the last time Nimbus and Coleman hatcheries worked together in a similar fashion was in the late 1970s. “I’ve never seen anyone open their fish ladder three weeks early before and we really appreciate it. It’s definitely not normal operating procedure for them.”
Before release, Coleman marks 25 percent of its salmon by clipping off the adipose fin—the small, fleshy fin on the fish’s back between the dorsal and caudal fins. These clipped salmon also have coded wire tags the size of pencil lead, inserted into their nose. Under a microscope, biologists can read the code etched on the tag to determine where and when the fish was hatched, and where it was released.
Fall-run Chinook from Battle Creek live three to four years and typically spawn in October and early November, compared to fish from the American River that spawn in November and early December
Retrieved November 8 2017 from http://calsportsmanmag.com/coming-together-name-salmon/