File:Bulletin (1957) (20239746188).jpg

Title: Bulletin
Identifier: bulletin2719571961illi (find matches)
Year: 1918 (1910s)
Authors: Illinois. Natural History Survey Division
Subjects: Natural history; Natural history
Publisher: Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
8 Illinois Natural History Survey Bulletin Vol. 27, Art. 1 best fishing for warmouths in experimental areas of central Illinois is in moderately clear water, the poorest fishing in tur- bid waters. Jenkins, Elkins, & Finnell (1955:42) found the slowest growing Oklahoma warmouth populations in waters known to be continuously turbid. In a comparison of fish populations in two southern Illinois ponds, one of which was more turbid than the other, Elder & Lewis (1955:394) reported that repro- duction and the coefficient of condition of warmouths was better in the less turbid pond, although growth was somewhat bet- ter for the warmouths in the more turbid pond. As the two ponds differed in age, size, density of fish population, and fertil- ity, turbidity was not the only factor that might have been responsible for differ- ences in growth. Depth Several field observations indicate that small warmouths remain in shallow weed beds, or other dense cover, for their food and protection, whereas larger warmouths spend more time in deeper water. In Venard Lake, small warmouths were collected in great numbers from the riprap- ping along the dam, fig. 3, where they were hiding beneath submerged rocks. Sel- dom were large warmouths taken from under these rocks; except during the spawning season, most of the fish of larger sizes were taken from deeper water. Relatively few warmouths of desirable sizes were found in a weed-choked chann(:i of Park Pond, although many large indi- viduals were taken in Park Pond proper. In Park Pond, winter collecting with an electric shocker turned up large numbers of small warmouths in shallow water close to the banks, although at that time the sur- face of the pond was covered with thin ice. Apparently, small warmouths do not leave their protected hiding places in shal- low water even during cold weather. This behavior contrasts sharply with that of bluegills. Bluegills, most numerous of the
Text Appearing After Image:
Fig. 3.—Warmouths, stunned with an electric fish shocker, near the riprapping of the dam at Venard Lake.

Note About Images