Margaret J. Filardo

Biologist at Fish Passage Center

847 NE 19Th Ave, Suite 250, Portland, Oregon, United States
Fish Passage Center
HQ Phone:
(503) 833-3900
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Last Updated 10/24/2016

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PhD  - 

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Fish Passage Center Contacts

Margaret Filardo, PhD
Biologist 503-833-3910

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96 Levels of Gas Bubble Trauma on Migrating Salmon, Steelhead Not Alarming at This Point, Staff, Columbia Basin Bulletin

The Fish Passage Center's Margaret Filardo theorized that resulted in increased TDG, and an increased incidence of "gas bubble trauma" being charted by monitors at the next dam downstream.
"That's when we started seeing trouble," Filardo said. The signs of GBT at Lower Monumental jumped to 4.8 percent of the fish sampled on May 25 just before the outage to 23 percent on May 28, then dropped down to 4 percent June 1, the day Little Goose went back on. Few of the cases ranked above a 1 on a scale of 4 with a 4 being a fish with the most severe GBT signs. No 4s were charted. The signs and levels of GBT seen so far on the lower Snake and Columbia are not alarming, at least so far, Filardo said. "Right now it's all good," Filardo said of strong, cool, fast river flows and plenty of spill to help get juvenile fish downriver and through the hydro system quickly.

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Researchers also have not yet completed the estimate of how many of the returning Chinook are wild versus those raised in a hatchery, said Margaret Filardo, a biologist with the Fish Passage Center.
"They're in the process of developing the estimate," Filardo said.

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