. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 126 ALFRED W. REELING, PATRICIO BERNAL AND ALEJANDRO ZULETA water, it stopped all opercular and body movements and appeared undisturbed by activities in the laboratory. Percentage oxygen in its branchial gas expelled into the polyox solution decreased up to almost one hour, when the final obser- vation indicated a sharp increase (Fig. 3, solid circles). This increase was unconfirmed because long experimental trials were difficult to complete. The struggling fish entering the polyox occasionally destroyed its expelled bubbles
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 126 ALFRED W. REELING, PATRICIO BERNAL AND ALEJANDRO ZULETA water, it stopped all opercular and body movements and appeared undisturbed by activities in the laboratory. Percentage oxygen in its branchial gas expelled into the polyox solution decreased up to almost one hour, when the final obser- vation indicated a sharp increase (Fig. 3, solid circles). This increase was unconfirmed because long experimental trials were difficult to complete. The struggling fish entering the polyox occasionally destroyed its expelled bubbles before they could be secured in the funnel, and the chance of disturbing the fish increased with time, so that reruns took up to four hours for one measurement. 30 o> e 25 l-J ui LlJ I- < o: LU |5 10. O ? •—20 (O) (O) © •—2 10 15 20 25 30 35 40 45 MINUTES BUBBLE HELD (after renewal) 50 55 FIGURE 4. Temporal decrease in the estimated rate of oxygen uptake from gas held in the gill cavities of clingfish emerged in the experimental aquarium described in Figure 3; solid circles, adult fish; open circles, half grown fish, crossed circles, young fish. Parentheses enclose points depicting rates estimated from volumetric oxygen depletion after the gas had been once depleted and then renewed (see text). Circles at the upper left depict off-scale approxi- mations of rates (numbers at right) measured after the fish had been emerged for relatively short periods of time. Problematical values are queried. Arrows indicate the average of two or three observations. The quicker response of the halfgrown fish supported the tenuous hypothesis of gas renewal as indicated by the adult trials. Nineteen trials showed a similar sharp increase in oxygen content after slightly more than 30 minutes (Fig. 3,. 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 pe
Size: 1416px × 1764px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
