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Largemouth Bass Behavior 

1/13/2015

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Black Bass Behavior Nature Bulletin No. 338-A March 29, 1969 Forest Preserve District of Cook County George W. Dunne, President Roland F. Eisenbeis, Supt. of Conservation

BLACK BASS BEHAVIOR There are some peculiar expressions in our American Slang. We admire "a smart cookie" but "a poor fish" is held in contempt, as if fishes were the dumbest creatures on earth. They may seem dumb, and some kinds probably are, but -- to expert fishermen and scientists who study the behavior of fish -- the black basses, for instance, appear to be as alert and intelligent as many of the so-called higher animals. In Illinois, where there are three species of them, they are the Number One fish for most anglers. The Largemouth black bass thrives in lakes and the more sluggish streams throughout the state. The smallmouth bass and the spotted bass prefer faster moving streams, the former being restricted to the northern half of Illinois and the latter to the southern part.

Black bass strike best in waters which are fished very little, or, in more popular spots, when the season first opens. As more and more people come to try their luck, the time between bites rapidly becomes longer and longer until even the experts may go home empty-handed. Contrary to popular belief, this does not mean that most of the bass have been caught out. It merely demonstrates that the fish have become "smart" and wary; they have learned to avoid those gaudy artificial flies or plugs, and even tempting live baits on the end of a line.

This was strikingly shown in a lake near Charleston, Illinois, operated experimentally by the State Natural History Survey for a study of bass fishing and how to improve it. In 1949, with 1027 marked bass in the lake, it took an average of only 24 minutes, each, to catch the first 50 but, by the end of that first day of fishing, it took over two hours to catch a bass. On the second day it took from 5 to 6 hours, and from 10 to 15 hours on the next three days. In other words, although most of them were still in the lake, it took -- about thirty times as long to fool a bass as it did at first. The memory of an escape from the hook, or perhaps the sight of a fellow bass caught and struggling, was apparently enough warning for the others to beware of those colorful gadgets.

Largemouth black bass really see color as color and not as shades of gray -- which is the way most mammals see it. In another series of experiments by the Survey, young bass, each in a separate aquarium, were shown a red medicine dropper and, after they came close for a good look, rewarded by a water flea or a mosquito wiggler squirted from it. Then they were shown droppers colored yellow, blue or green, respectively, but were punished with a small electric shock if they came too close. After only 5 to 10 such training trials, the fish would hover close to the red dropper, waiting for food, but would back away to the far side of the tank if any other color was shown. Similarly, other fish were trained to come to yellow, green or blue droppers. They were able to distinguish most of these colors from a confusing series of gray droppers ranging from white to black. They had trouble telling yellow from pale gray, and blue from dark gray or black. Surprisingly, it was proved that bass see colors about as well as a human being wearing yellowish sun glasses.

Further, the Survey has found that each smallmouth black bass seems to have a favorite home, usually a shaded pool, where it spends most of its life. And that most of them are able to find their way back home after being caught, tagged and hauled to another part of the stream, or even another stream in the same river system.
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