. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BEHAVIOR OF WEAKLY ELECTRIC FISHES 207 APRIL 23 I 2-20 AM. 5 1,2 APRIL 30 . 22 2'20 T I ,3,6 I I. 3 1, 2 I A A A A A. FIGURE 4. Transects of electrical activity versus position (date and time as noted), taken along the path indicated in Figure 3 and plotted by the method described in the text. Net gain of the electronic apparatus used was 5 times higher in the first trace than in the second and the fourth, and 10 times higher than in the third. The numbers under activity peaks refer to identi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. BEHAVIOR OF WEAKLY ELECTRIC FISHES 207 APRIL 23 I 2-20 AM. 5 1,2 APRIL 30 . 22 2'20 T I ,3,6 I I. 3 1, 2 I A A A A A. FIGURE 4. Transects of electrical activity versus position (date and time as noted), taken along the path indicated in Figure 3 and plotted by the method described in the text. Net gain of the electronic apparatus used was 5 times higher in the first trace than in the second and the fourth, and 10 times higher than in the third. The numbers under activity peaks refer to identified groups of fish (Table I). Artifacts are indicated by the letter A. The heavy line trace shows in depth in meters. In each case the distance covered was about 140 m, but during the uppermost trace paddling speed was slower, and thus the trace is somewhat longer. It may be seen that the major peaks of activity appear in the same places at all times, and that at night virtually all activity is lost. to decrease at buoy A. At buoy B, activity of group 1 and 3 lessened, but was replaced, towards 1900 hrs, by activity of group 2. After 2000 hr activity de- clined at both buoys, and by 2100 hr what little remained consisted of a mixture of all groups (mostly single specimens) at buoy A and group 1 and 2 at buoy B. ~L ° o - "O £" S°2 «= ° I c — I. 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 Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
