. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CORTISOL RHYTHMS IN GULF KILLIFISH 475 30 DO 3. o CO 20 c/o 03 15 June August Combined. 0600 1400 2200 Time FIGURE 3. Daily rhythms in concentration of plasma cortisol in female specimens of Fundulus grandis in June and August. rise in occurring between 1400 and dusk in June and between 0200 and 0600 in August. High plateau levels of cortisol were maintained throughout the night in June. The disturbance associated with the sampling procedure caused a significant rise in cortisol content within a period of less than fi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CORTISOL RHYTHMS IN GULF KILLIFISH 475 30 DO 3. o CO 20 c/o 03 15 June August Combined. 0600 1400 2200 Time FIGURE 3. Daily rhythms in concentration of plasma cortisol in female specimens of Fundulus grandis in June and August. rise in occurring between 1400 and dusk in June and between 0200 and 0600 in August. High plateau levels of cortisol were maintained throughout the night in June. The disturbance associated with the sampling procedure caused a significant rise in cortisol content within a period of less than fifteen minutes. For the entire group of fish employed in the study, the average increment in for each unit increase in sample sequence number was pg%. The regression coefficient () is significantly different from zero according to analysis of variance of linear regression. The rise in by the end of a fifteen minute series of ex- sanguinations was about 7 The data do not permit any conclusions con- cerning possible changes in occurring in the time interval (30-60 seconds) between the initial disturbance and the first exsanguination. DISCUSSION The existence of daily rhythms of plasma cortisol in Fundulus grandis is not surprising in view of the widespread occurrence of daily rhythms of adrenocortical hormones in the higher vertebrates. The presence of these rhythms under natural conditions in a fish strengthens the idea that they have important 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 Laborato
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