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Flooding's effect on salmon will be seen later

Posted: September 30, 2012 - 12:04am

ANCHORAGE — A scientist with the Alaska Department of Fish and Game says the impact of recent flooding and high waters on Alaska’s salmon won’t be clear for years.

Bob Clark, the department’s chief scientist for sport fish, told the Anchorage Daily News there’s a potential for fewer fish in the future, but it’s too early to tell.

“The way we sort of evaluate some of these environmental effects - freezing, flooding, not enough snow, too much snow - at least for salmon is when they come back as adults,” he said.

Fish production could dip if fast-moving water scours spawning sites of eggs, Clark said. Fewer juvenile salmon may survive if those that wind up in flood plains don’t find their way back into rivers once flooding subsides.

But for now, no one can accurately predict what will happen.

Clark says everyone will need to wait until the salmon come back as adults to get more information about the future.

For pinks, that means two years from now, Clark said. It’ll be three to four years to know about silvers and reds and four to seven years for kings.

“Anytime we get this catastrophic kind of flooding where there’s lots of gravel being moved around, you wonder about spawning success,” he said.

More than eggs are at risk

In the mid-1980s, flooding of the Susitna River altered salmon production for a couple of years, but it also moved some pike around and the dispersal of pike into that drainage has caused some problems.

Other species, like trout and Dolly Varden, could lose an important source of food if dead salmon are washed out of rivers.

“It takes food away from the fish,” Clark said, “but it also creates more food, because you get more insects and there’s more movement of leaves into the system.”

Clark emphasized that salmon are adaptable. Those that populate rivers prone to flooding are particularly adaptable, he said, and silvers in general are especially adjustable and Cohos are good at handling floods by moving upstream and spawning in areas they usually can’t get to.

“So there are positive effects. I hate to say that with all the fallen trees and flooded golf courses,” he said.

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