. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 170 BULLETIN OF THE BUEEAU OF FISHERIES SIZE AND AGE AT MATURITY Sexually matured black drum with a total length range from 27 to 105 centi- meters ( to inches) were taken. Only fish that possessed developing sexual products (granular roe in the females) were sexed, thus obviating personal errors in judging the state of development. It ^vill be observed, by inspection of Table 16, that the drum found in a ripening or spawning condition during July to October, 1926, were of small
. Bulletin of the United States Fish Commission. Fisheries -- United States; Fish-culture -- United States. 170 BULLETIN OF THE BUEEAU OF FISHERIES SIZE AND AGE AT MATURITY Sexually matured black drum with a total length range from 27 to 105 centi- meters ( to inches) were taken. Only fish that possessed developing sexual products (granular roe in the females) were sexed, thus obviating personal errors in judging the state of development. It ^vill be observed, by inspection of Table 16, that the drum found in a ripening or spawning condition during July to October, 1926, were of smaller minimum and LENGTH OF FISH. MM 10 20 30 SCALE LEhiGTh 0 10 20 JCALE WIDTH 40 Fio. 22.—Correlation between scale length and width and total body length in the black drum. The average values of the scale lengths and widths corresponding to a succession of body lengths lie nearly upon a straight line, indicating that on the average the growth increment of the scales is a constant proportion of the giowth increment of the fish maximum length than those taken during the main spawning period in the winter and spring of 1927. This difference extends particularly to the older and larger fish, only one drum above 58 centimeters ( inches) being taken during 1926, compared with many secured in 1927 by the writer and by commercial fishermen. This condition is unaccounted for at present. One possibihty, however, is that many of the youngest maturing fish (I class) reach sexual maturity either several months prior to or after the older classes Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States Fish Commission. Washington, The Commission, Govt. Print. Off
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Keywords: ., book, bookcentury1900, bookcollectionbiodiversity, bookdecade1920
