. The Biological bulletin. Biology; Zoology; Marine biology. 0 N D 1973 F M A M J J 1974 A S 0 N D J F M A J J 1975 A S Figure 6. Mean weights (upper line) and oocyte diameters (lower line) of specimens of Aplysia plotted against time. These animals were collected at Palos Verdes, California, by Pacific Biomarine Supply Co. Most data points represent at least 10 individuals (see text). These were sacrificed throughout the month indicated, and collected an average of 11 days prior to being killed. Bars indicated standard error of the mean. Discussion Data presented in this paper support the hyp
. The Biological bulletin. Biology; Zoology; Marine biology. 0 N D 1973 F M A M J J 1974 A S 0 N D J F M A J J 1975 A S Figure 6. Mean weights (upper line) and oocyte diameters (lower line) of specimens of Aplysia plotted against time. These animals were collected at Palos Verdes, California, by Pacific Biomarine Supply Co. Most data points represent at least 10 individuals (see text). These were sacrificed throughout the month indicated, and collected an average of 11 days prior to being killed. Bars indicated standard error of the mean. Discussion Data presented in this paper support the hypothesis that Aplysia have a life expectancy of approximately one year, and a single extended period of copulation and egglaying which begins late in spring and ends in the fall with the death of the sexually mature population. Although migration into deeper water and reappearance in the spring cannot be entirely ruled out, there is presently no evidence in support of this hypothesis. Animals found in the spring tend to be smaller and more abundant than those found later in the year. They appear healthy and live for long periods under laboratory conditions, in contrast to animals obtained in the fall whose skin is often eroded and who usually die after a short period of captivity. The extended period of egg production might be expected to result in asynchrony with respect to size and sexual maturity within the population. However, there. 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 Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]
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