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The California Department of Fish and Wildlife (CDFW) has reported that fall-run Chinook salmon fry released from the Fall Creek Fish Hatchery in Siskiyou County are believed to have died from gas bubble disease in the Klamath River. Gas bubble disease occurs when fish are exposed to sudden changes in water pressure, such as passing through dams or other structures. The mortality rate among the salmon fry downstream of the Iron Gate Dam tunnel suggests that gas bubble disease was the cause. The CDFW plans to conduct future salmon releases below the dam until it is removed. Gas bubble disease does not pose a health risk to humans who consume affected fish. [Extracted from the article]