DFG Surveys Salmon Anglers on Central Valley Rivers
August 1, 2012
The Department of Fish and Game’s (DFG) Central Valley angler surveys have begun on the American, Feather, Mokelumne and Sacramento rivers. Over the next five months, survey crews will repeatedly visit 20 different sections of river to cover the full extent of the inland salmon fishery. Survey crews count the number of boats and anglers, weigh and measure each fish caught and collect the heads of those salmon imbedded with a coded wire tag.
“The information the survey crews collect is vital to understanding the dynamics of the salmon fishery resource and for setting seasons in the future,” said Mike Brown, a DFG environmental scientist. “The collection of salmon heads imbedded with tiny coded wire tags provides a history of how each hatchery release has fared and gives us information that can help guide salmon management in future years.”
During the 2011 Central Valley fall-run Chinook salmon sport fishery survey, crews contacted more than 4,000 fishing parties, measured 2,805 salmon and collected 652 salmon heads with coded wire tags in them. This and other baseline information were fed into a computer program that estimated the total effort and harvest of Chinook salmon in the 2011 Central Valley river sport fishery.
Those results showed approximately 60,500 salmon were caught and kept and 10,990 salmon were released for a total catch of 71,489. Seventy percent of the salmon kept were 2-year-olds, also known as “jacks.” Anglers fished on average about 14 hours to catch a salmon.
The 2012 salmon season is anticipated to be more productive than 2011.
Since 2007, 25 percent of salmon smolts released at each of the five Central Valley salmon hatcheries had their adipose fin clipped and a tiny coded wire tag inserted into the fleshy portion of their snout. Samplers check each salmon to see if its adopse fin, the small fleshy lobe on the fish’s back between the dorsal fin and the tail fin, is missing. If it is missing, the fish bears a coded wire tag.
During the survey, samplers carry large plastic bags for anglers to carry salmon after heads are removed. Upon request, the angler survey will provide the angler with a recognition letter containing information about their catch, including hatchery origin, age and release information. Although anglers on occasion do not want samplers to take the head of their catch, most voluntarily comply once the reason for the collection is explained.
Section 8226 of the Fish and Game Code states, “Anglers upon request by an authorized agent of the Department, [must] immediately relinquish the head of the salmon to the State.”
The data collected by survey crews is essential for management of the highly popular salmon fishery.
Anglers can review a summary of the Central Valley Fall-Run Sports Fishery for 2011 at:
Mike Brown, DFG Environmental Scientist, (916) 227-4989
Harry Morse, DFG Communications, (916) 323-1478