Old fish are good sign for Eagle River | PostIndependent.com

Old fish are good sign for Eagle River

Matt TerrellVail CorrespondentGlenwood Springs, CO Colorado
Dominique Taylor/Vail DailyBiologists John Woodling, center and Alan Vajda, left, both from the University of Colorado, record the weight and length of a brown trout temporarily stunned Friday in the Eagle River at Arrowhead.

EDWARDS Senior citizens are a good thing to find flopping in the Eagle River.Thats why biologist John Woodling was excited to pull from the water an eight-year-old trout, which is sort of an ancient oddity in the fish world. He knows this because of the small tag he found embedded in its head. Someone put it there five years ago when the fish was probably three, and here he is, still swimming.Were seeing lots of ages today, which is a good thing for the river, Woodling said.That trout was one of hundreds of fish shocked in the Eagle River Thursday and Friday by several volunteers along with members of the Colorado Division of Wildlife, the U.S. Forest Service and the Eagle River Watershed Council conservation group.The process is called fish shocking because literally, the fish are stunned with electric probes and collected by quick people with nets and waders. The dazed fish are then counted, measured and weighed by a team of biologists to determine the rivers health.Mainly, theyre concerned about the high levels of metal that have spilled over the years from the Eagle Mine south of Minturn and hurt the fish population. There was a major cleanup around the mine site, and overall, things are looking better than they did 17 years ago, Woodling said.

The biologists are looking for a few things. Finding a lot of fish is good, but its also important to find a wide variety of species and ages. Brown trout, for instance, are pretty tolerant of zinc in the water, while a fish called a sculpin can barely stand it.Certainly theres been dramatic improvement, said Wendy Naugle, a hydrologist with the Colorado Department of Public Health and Environment. We have good and bad years, but its still much better than it was before the mine cleanup.Delicate species like sculpin havent been found in areas closer to the mine though, but brown trout are thriving in those more polluted areas, which means the river is getting better, Woodling said.The Division of Wildlife has been doing this for the past 17 years. They count fish at four mine sites and three reference sites that werent as polluted.While the numbers of trout have steadily increased since the mid 1990s, the numbers have leveled off and even dropped in some years even though the amounts of metal in the water didnt have a corresponding increase. Thats one of the mysteries everyones trying to solve by collecting the data.The objective here is to use the data to determine when the river is healthy enough, Woodling said.As for this years shocking project, the numbers have to be crunched and analyzed to get a true picture of how the river is shaping up this year, Naugle said.Staff writer Matt Terrell can be reached at 748-2955 or mterrell@vaildaily.com.

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