Jason
@heartlandfishin
heartlandfishing.blogspot.com
[excerpt]...Unfortunately, there are exotic species of crayfish that can cause problems in waters where they are not native. One of those crayfish species that has caused problems in some parts of the United States is the rusty crayfish, Orconectes rusticus. Rusty crayfish are native to the Ohio River basin in Indiana, Ohio, Illinois, Kentucky, and Tennessee but have been introduced to many other “Midwestern” states. Once introduced into waters outside their native range, rusty crayfish have caused some major problems. Rusty crayfish have literally elminated aquatic vegetation from some waters and thus dramatically altered the aquatic habitat and food chain. They also out-compete native crayfish and may have significant impacts on other aquatic macroinvertebrates (e.g. aquatic insects). In some cases it is suspected that rusty crayfish prey on fish eggs. So, once again this is another example of an exotic species that we would like to keep out of our waters. [read the entire article]
Dewey, on the other hand, was pretty good fishing. The lake was full, and the water was the clearest I remember. Past years found us fishing mostly the east end along the reeds, and the middle of the lake. This year, we fished mostly the west end of the lake. We put in on the western most ramp (there are now 4 ramps on Dewey). We caught a lot of fish, northern and a couple perch, about 50-100 yards straight south of the ramp. We repeatedly passed through that general area and caught fish nearly every time.
We threw mostly brightly colored spoons (I am a fan of Little Cleo's) and retrieved pretty slowly to get them nearer the bottom (it's only about 6 foot deep there). 
The refuge boasts some of the best northern fishing in Nebraska, but due to these lakes be shallow, sandy bottom lakes, they get pretty mossy and weedy come mid-summer which makes them hard to fish. 
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