. Bulletin. Natural history; Natural history. Aug. 1981 Bergmann: Larval Fishes 623 E o u~ ~ fO " ffl s~^ ~ 0* / ^^. TIME Fig. 3.—Vertical distribution of gizzard shad larvae In Lake Sangchris on 28 May 1976. Table 4.—Length-frequency distribution of gizzard shad larvae collected during the day and night on 28 May 1976. Total Density '10 m' Night:Day Length (mm) Day Night Ratio 4-5 6-7 8-9 17,1 10-11 12-13 14-15 16-17 18-19 20-21 Total ly collections should be considered an underestimate of
. Bulletin. Natural history; Natural history. Aug. 1981 Bergmann: Larval Fishes 623 E o u~ ~ fO " ffl s~^ ~ 0* / ^^. TIME Fig. 3.—Vertical distribution of gizzard shad larvae In Lake Sangchris on 28 May 1976. Table 4.—Length-frequency distribution of gizzard shad larvae collected during the day and night on 28 May 1976. Total Density '10 m' Night:Day Length (mm) Day Night Ratio 4-5 6-7 8-9 17,1 10-11 12-13 14-15 16-17 18-19 20-21 Total ly collections should be considered an underestimate of actual larval shad den- sities. During the weekly collections there were consistent differences in the size of gizzard shad larvae at different depths. For 16 of the 18 occasions when samples contained at least 30 larvae, the mean length of the larvae decreased with in- creasing depth. The decrease in size of larvae with increasing depth can be large- ly attributed to the abundance of prolar- vae (3-5 mm) in deep water. Subsurface tows accounted for 68 percent of the pro- Table 5.—Mean total length (TL) of gizzard shad larvae collected at different depths during day and night collections on 28 May 1976. Day Night Depth (m) TL (mm) No Measured TL (mm) No ,Measured 0 1 2 3 Total () () () () 407 289 203 92 991 (1,6) 10,1 () (1,7) 9,9 (1,8) 182 198 286 270 9)6. 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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