. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PREZOEAE OF CANCER MAG 1STEK 251 lOOr 90 80 ? 70 I o l- I CO CO o o 50 40 g 30 0£ UJ £L 20 10. 10 15 20 25 SALINITY (%») 30 35 FIGURE 1. Effect of salinity on hatching of Cancer magister eggs at ° C. examined for hatching at intervals of about 5 minutes for 36 hours, and the hatched larvae were observed for molting at the same intervals for the first hour after they had hatched and then again at the end of the 36-hour experiment. RESULTS Some eggs hatched at all the test salinities, and 94% of these are known to have hat
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. PREZOEAE OF CANCER MAG 1STEK 251 lOOr 90 80 ? 70 I o l- I CO CO o o 50 40 g 30 0£ UJ £L 20 10. 10 15 20 25 SALINITY (%») 30 35 FIGURE 1. Effect of salinity on hatching of Cancer magister eggs at ° C. examined for hatching at intervals of about 5 minutes for 36 hours, and the hatched larvae were observed for molting at the same intervals for the first hour after they had hatched and then again at the end of the 36-hour experiment. RESULTS Some eggs hatched at all the test salinities, and 94% of these are known to have hatched into prezoeae (Table I). Of the remainder (6%), all of the eggs but one were in the two highest salinities at which the prezoeae may molt to zoeae as early as 2 minutes after hatching. Therefore, we believe that all of the hatching eggs hatched into prezoeae, but because of the short duration of this larval stage, especially at the higher salinities, some prezoeae could have hatched and molted between observations and thus they would not have been seen. The percentage of eggs hatching at ° C increased as salinity decreased to an optimum of 15',,, but at I0c/co was lowest (Fig. 1). At a salinity of 32%o, the mean percentages of eggs that hatched at and ° C were 30 and 73%, respectively, indicating a marked temperature effect (Table I). The mean percentages of prezoeae that molted to zoeae increased with increasing salinity from 0% at Wf/f0 to 100r/t at 30 and 32%c (Table I and Fig. 2). With. 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. : M
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
