. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 25- 50 H MOVEMENT DOWNSTREAM 75 H 100 J 1200 1700 2200 030008001300 1800 230004000900 1400 1900 2400 0500 1000 1500 TIME OF DAY FIGURE 2. The pattern of swimming of juvenile shrimp collected from an early evening ebb tide (Full Moon). The shrimp were maintained under constant conditions within two current chambers (I and II) for three days following their collection from nature. Swimming was recorded in terms of the number of individuals swimming upstream and downstream during two minute observation periods made at 3(J minut
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 25- 50 H MOVEMENT DOWNSTREAM 75 H 100 J 1200 1700 2200 030008001300 1800 230004000900 1400 1900 2400 0500 1000 1500 TIME OF DAY FIGURE 2. The pattern of swimming of juvenile shrimp collected from an early evening ebb tide (Full Moon). The shrimp were maintained under constant conditions within two current chambers (I and II) for three days following their collection from nature. Swimming was recorded in terms of the number of individuals swimming upstream and downstream during two minute observation periods made at 3(J minute intervals. For further explanation see Figure 1. In shrimp collected both from early and late ebb tides it appeared that up- stream swimming, at what may be considered appropriate times, is only possible in recently collected animals. Those maintained in a current chamber for longer than a day or two often appear incapable of the "effort" involved and will fre- quently drift or swim downstream. DISCUSSION Postlarvae An endogenous tidal rhythm of swimming was shown in which upstream and downstream swimming were manifested at the times of flood and ebb tides,. 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
