. Bulletin. Natural history; Natural history. 50 Illinois Natural History Survey Bulletin Vol. 27, Art. 1. TOTAL LENGTH OF FISH IN INCHES Fig. 15.—Regression line expressing the re- lationship between total length of fish and radius of scale for 1,068 warmouths collected from Park Pond and Venard Lake, early June, 1948, through middle November, 1949. The dots show the anterior radius of scaleX41 for fish of various total lengths (one-half-inch intervals). intervals, and the average of the total lengths for the fish in each of these classes was determined. Sc
. Bulletin. Natural history; Natural history. 50 Illinois Natural History Survey Bulletin Vol. 27, Art. 1. TOTAL LENGTH OF FISH IN INCHES Fig. 15.—Regression line expressing the re- lationship between total length of fish and radius of scale for 1,068 warmouths collected from Park Pond and Venard Lake, early June, 1948, through middle November, 1949. The dots show the anterior radius of scaleX41 for fish of various total lengths (one-half-inch intervals). intervals, and the average of the total lengths for the fish in each of these classes was determined. Scales of these fish were placed in a scale-reading machine that magnified 41 times, and images of the an- terior radii of the scales were measured and averaged for the fish in each length class. Average total lengths of fish and corresponding average anterior radii of selected scales were used in developing the regression line shown in fig. 15 and the following equation: L—+ S where L^total length of fish in inches and S=41 X anterior radius of scale in inches Relation of Body Growth to Tail Growth.—Growth of the body of a fish in relation to growth of its tail, or caudal fin, may be ascertained by comparing the stand- ard length of the fish with its total length. As defined by Hubbs & Lagler (1947 : 13), total length includes the caudal fin, where- as standard length does not. The relationship between growth of body to growth of tail was calculated from measurements of 264 warmouths taken from Park Pond, summer, 1948, and No- vember, 1949, and Venard Lake, October, 1949. As the average body length of the warmouths increased, the average tail length became relatively less, table 17. In fish less than inches total length, the average total length was times the average standard length; in fish of to inches, the average total length was times the average standard length; and, in fish longer than inches, the average total length was 1
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