SALEM, Ore. -- A chemical blamed for killing American pets through an ingredient in pet food was found in feed used at Oregon fish hatcheries.

The U.S. Food and Drug Administration confirmed melamine was found in the feed at the Marion Forks Hatchery in Idanha, Ore., according to ODFW’s Rick Taylor. 

The hatchery manager stopped using the feed several days before. The food is used as a starter diet for young salmon and trout. 

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Officials said that the same lot was sent to the Willamette, Gnat Creek, Big Creek, Cole Rivers, Butte Falls and Leaburg hatcheries. 

"Although officials from the FDA have not associated any risk to the fish or humans as a result of the melamine finding, we've stopped using the ... feed," Steve Williams, ODFW deputy fish administrator said.  

"We're taking a measured approach and working with several state and federal agencies to ensure the health of our hatchery fish populations."

All of the hatcheries have stopped using the feed, officials said.

The fish feed was made in Vancouver, Canada by the Skretting Company and distributed under the Bio-Oregon label out of Longview, Wash. 

The company also recalled that brand of feed.

The FDA said Tuesday the contamination level was probably too low to pose a danger to anyone who may have eaten the fish.

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A school of salmon swims by a fish counting station at Bonneville Dam.

The Canadian-made meal included what was purported to be wheat gluten, a protein source, imported from China. The material was actually wheat flour spiked by the chemical melamine and related, nitrogen-rich compounds to make it appear more protein rich than it was, officials said.

After pigs and chickens, the farmed fish mark the third food animal given contaminated feed. The level of contamination is expected to be too low to pose any danger to human health, said Dr. David Acheson, the FDA's assistant commissioner for food protection.

It wasn't immediately clear if any of the farmed fish entered the food supply. However, Acheson said at least one firm's fish were still too young and small to be sold. Investigators were visiting other U.S. aquaculture farms that used the contaminated feed.

Melamine, a chemical found in plastics and pesticides and not approved for use in pet or human in the U.S., contaminated pet food that either sickened or killed an unknown number of dogs and cats. Since March 16, more than 100 brands of pet food have been recalled because they were contaminated with melamine.

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Acheson said that fish samples would be screened for signs of melamine. "Depending upon what we find in that testing, that is going to drive the next steps," Acheson said.

Canadian officials are aware of the finding, Acheson said.

"We used it to make pet food. They used it to make fish meal," he told reporters.

Federal health and food officials have said some 20 million chickens and thousands of hogs also were fed feed contaminated by melamine. As with the fish, they said the risk to human health is very low.

U.S. investigators also have learned that the purported Chinese wheat gluten and a second ingredient, rice protein concentrate, were actually simple wheat flour. The flour was spiked with melamine and related, nitrogen-rich compounds to make it appear more protein rich than it was. In tests, nitrogen levels are measured to gauge the overall protein content of food ingredients.

"What we discovered is these are not wheat gluten and rice protein concentrate but in fact are wheat flour contaminated by melamine," Acheson said.

The FDA is considering enforcement options, he added. The ingredients came from two Chinese firms: Xuzhou Anying Biologic Technology Development Co. and Futian Biology Technology Co. Ltd.