Press Release

Anglers are needed to catch Chinook for research

Biologists need samples from fish caught in three reservoirs and a lake

Many anglers are awaiting the arrival of Chinook salmon, but they’ve already been here a while, and they’re ready for fishing. They’re not Chinook that come from the ocean. Idaho Fish and Game stocks land-locked Chinook in lakes and reservoirs, and biologists are asking anglers to help them learn more about these fish in Anderson Ranch, Lucky Peak and Deadwood reservoirs in southwest Idaho and Spirit Lake in North Idaho.

Chinook study, Lucky Peak, Phil Branigan
Creative Commons Licence
Photo by Roger Phillips/Idaho Fish and Game

Biologists are installing signs and drop boxes at those locations and want anglers who catch a Chinook to leave a small tissue sample from the fish for research.

“To evaluate the performance of these fish, we are asking for anglers to provide fin clips,” Research Biologist Phil Branigan said. “We’re currently stocking two types of Chinook in reservoirs, sterile and fertile, and we’re trying to learn which ones are more likely to get caught by anglers.”

Researchers are also doing work to determine how the two types of Chinook differ in growth rates. The study is expected to last four to five years. Researchers are relying on anglers because they are the most cost-effective way of getting fin clips. 

“We can’t do this evaluation without their cooperation,” Branigan said. 

The process is simple: 

  • Catch a Chinook from any of the four waters that are part of the research. Chinook can be identified by black spots on their backs, black gum lines, and a clipped adipose fin.
    Chinook salmon female, illustration by Joseph R. Tomelleri
    All rights reserved.
    © Joseph R. Tomelleri
  • Clip a small (about the size of a hole punch) portion of any fin. A sample can be taken from any size of Chinook, and the fish can be harvested or released.
  • Place the fin clip in an envelope provided at kiosks. Seal the envelope and keep it dry to avoid spoiling. 
  • Deposit the envelope in the drop box at the kiosks, which can be found at major access points at the four locations.

Land-locked Chinook in lakes and reservoirs can have double benefits for anglers. They prevent kokanee from getting overpopulated and undersized, which means larger kokanee for anglers. At the same time, Chinook grow large and provide trophy fish for anglers to catch. 

“We’re hopeful that by stocking the best type of Chinook, we can ultimately make fishing better, so we’re optimistic anglers will help us with this project,” Branigan said. 

Kiosks are currently installed at Lucky Peak, Anderson Ranch and Spirit Lake, but installation at Deadwood will likely be delayed until late spring or early summer due to high snow pack in the mountains. 

For more information about the study call (208) 465-8404 ext. 233.