. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 378 BULLETIN OF THE BUREAU OF FISHERIES Table 44 shows the value of Tc for male and female lake herring taken in the fall just before spawning. The lengths and weights are the averages for various age groups, as shown in Table 32. The Ic averages for males () and females () differ only in the fourth decimal place. In Table 45 age and sex are dis- regarded, and the values for ^ are based on size only. The herring were arbitrarily divided into size groups with definite hmits,
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 378 BULLETIN OF THE BUREAU OF FISHERIES Table 44 shows the value of Tc for male and female lake herring taken in the fall just before spawning. The lengths and weights are the averages for various age groups, as shown in Table 32. The Ic averages for males () and females () differ only in the fourth decimal place. In Table 45 age and sex are dis- regarded, and the values for ^ are based on size only. The herring were arbitrarily divided into size groups with definite hmits, which were selected so that a sufficient number of specimens would be included in the group. Thus, the average, centi- meters, represents the 17 smallest herring collected; that is, herring centimeters. Fig. 46.—Length-weight relationship of Saginaw Bay herring taken in the fall ju.'Jt before spawning. The curve is plotted from theoretical weights computed by means of the length- weight formula W=^, in which /:= The crosses represent actual weights (see Table 46). or less in length. It may be seen from Table 45 that the value of Tc changes com- paratively little with size, and that the average foimd for the species is Substituting this average for the Ic in the above formula, I computed the theoreti- cal weight of herring of various sizes and compared the calculated values with the actual where possible. These various values are given in Table 46 and plotted in Figure 42. If we the largest size gi'oup we find that the average difference between the actual and calculated values amounts to only grams. For all fish this difference is grams. The crosses in Figure 42 represent actual measurements, the curve the theoretical or calculated values. The agreement between the t'wo. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of thes
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