. Bulletin. Natural history; Natural history. March, 1965 Stakrett & Fritz: Fishes of Lake Chautauqua 37 Table 21.—Average total lengths of channel catfish of various ages at Lake Chautau- qua, 1953-1958. Age of Fish (Years) 3 4 5 6 7 1953 1954 1955 1956 1957 1958 Average the inches total length average for the Lake Chautauqua 3-year-old chan- nel catfish was biased because of the scarcity of fish under inches in
. Bulletin. Natural history; Natural history. March, 1965 Stakrett & Fritz: Fishes of Lake Chautauqua 37 Table 21.—Average total lengths of channel catfish of various ages at Lake Chautau- qua, 1953-1958. Age of Fish (Years) 3 4 5 6 7 1953 1954 1955 1956 1957 1958 Average the inches total length average for the Lake Chautauqua 3-year-old chan- nel catfish was biased because of the scarcity of fish under inches in our samples. The growth rates of channel catfish in Lake Chautauqua were excel- lent compared with the growth rates of these catfish in some other waters of the mid-continent (Tables 20 and 21; Fig. 11; Appelget & Smith 1951:123; Finnell & Jenkins 1954:10; Schoffman 1954:5; Marzolf 1955:247; Harrison 1957:662; and Muncy 1959). Data on the av- erage lengths of Lake Chautauqua channel catfish of various ages (Table 21) indicate that only minor variations occurred in the year-to-year growth rates of these catfish. Freshwater Drum Growth R\tes.— The scales used for aging 2,.345 fresh- water drum at Lake Chautauqua were collected from fish taken in the com- mercial seines used on the lake each September, 1951-1958. Age and growth information is given in Tables 1 and 22. The average length of inches shown in Table 22 for 2-year-old fish is prob- ably too high because of two known biases in our samples. In Illinois, it is illegal to take drum under inches in length (undressed) with commercial fishing devices. The large mesh size of the seines used on the lake allowed the escape of most of the drum under inches in length. The drum aged in this study as 2-year-olds, and to a lesser ex- tent the diTim aged as 3-year-olds, were probably the largest members of their year-classes. The growth rates of drum at Lake Chautauqua were fair compared with growth rates
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