Different Holding Tanks = Stronger Salmon?

November 22, 2010


A lap-pool for salmon?


"font-size: 14pt">It sounds far fetched but, in essence, that's the technology being tested by Chelan County

PUD at its Chiwawa and Eastbank Hatcheries . Hatchery managers told Commissioners this week that an effort to save

water seems to be producing juvenile salmon and steelhead that appear stronger and travel faster to the ocean.


"font-size: 14pt">They've turned to circular tanks of fiberglass, with a constant recirculating water flow. The

circular current helps dispose of waste more efficiently at a central drain, and the system requires only about

one-eighth the water of a standard hatchery raceway.

With fish swimming against the

circular current, managers say the system seems to be producing fish that are stronger and make it downstream

faster. Click above for the explanation from fish biologist Josh Moraskas…

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The PUD is

trying to develop new facilities so it can move away from using the antiquated Eastbank Hatchery facilities on

Turtle Rock Island just north of Rocky Reach Dam in the Columbia River.

 The PUD is required to

produce hatchery fish as part of its “no-net-impact” requirement in Habitat Conservation Plans for

Rocky Reach and Rock Island dams.