The Mysis Shrimp Factor
Glenwood Springs, Colorado CO
Mysis shrimp, or “Mysis relicta,” are one of the reasons we have such big fish in the Fryingpan River here in Basalt.
After the last ice age, these relatives of saltwater shrimp became stranded inland and evolved to become freshwater-tolerant. Beginning in the 1950s, these shrimp were stocked in some of Colorado’s reservoirs, including Reudi Reservoir here just outside of Basalt.
Our fish in the Fryingpan are fed these morsels year-round in the upper miles of the river, as they are flushed from the deeps of the reservoir into the spillway, also known as the “toilet bowl.” The amount of protein in these shrimp is very high, resulting in larger-than-average trout.
These shrimp abhor sunlight, and prefer the deeper, darker depths for habitat, though they are known to rise to the surface at night to feed on zooplankton. The dam on Ruedi Reservoir is a “bottom release,” which results in thousands of mysis daily being flushed out to hungry trout in the river below.
Healthy mysis shrimp are clear to translucent, and they turn white when dead or dying. There are perfect patterns to imitate these stages of the life cycle, such as Will Sands’ epoxy mysis (clear) and Tim Heng’s TC mysis (white).
The white patterns tend to produce better farther away from the dam, and the clear work best closer to the spillway. Many of us carry a lot of different patterns for these shrimp, including our own secret recipes. It seems they always want one particular pattern on each particular day, so keep a few different styles of mysis flies in your boxes!
One interesting side note about the stocking of these shrimp in Colorado was that they were introduced primarily to feed Kokanee salmon, which were also introduced by man. The only problem with this scenario was that Kokanee have poor eyesight and, therefore, couldn’t see these shrimp to eat them.
Additionally, salmon are more comfortable at different depths than these shrimp prefer. The positive result of this miscalculation is larger-than-average lake trout, or Mackinaw (lakers see these shrimp just fine) and larger-than-average fish in the tailwaters below these reservoirs.
Mysis have a neutral buoyancy and, consequently, flies are readily fished high to low in the water column.
Pay close attention to how and where the trout are feeding when you fish these flies, and adjust your rig accordingly. Your best bet to find the biggest fish feeding on these bugs is when our flows are raised, resulting in more shrimp spilling out of the dam.
Stop by Taylor Creek before heading up to the dam, and we will square you away with the right imitations, location and best fishing times!
– This report is provided every week by Taylor Creek Fly Shops in Aspen and Basalt. Taylor Creek can be reached at (970) 927-4374 or taylorcreek.com.
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PHOTO: Fire in median by Grizzly Creek caused brief closure of I-70 in Glenwood Canyon Wednesday afternoon
Eastbound traffic on Interstate 70 sits at a standstill just east of exit 116 in Glenwood Springs after a small fire ignited in the median near Grizzly Creek and briefly shutting down both lanes of traffic on Wednesday afternoon.