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Reproduction in the Aggregating Sea Anemone, Anthopleura elegantissima

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Title:Reproduction in the Aggregating Sea Anemone, Anthopleura elegantissima
Authors:Ford, Charles E Jr.
Date Issued:Apr 1964
Publisher:University of Hawai'i Press
Citation:Ford CE. 1964. Reproduction in the aggregating sea anemone, Anthopleura elegantissima. Pac Sci 18(2): 138-145.
Abstract:From a sample of 240 specimens of the aggregating sea anemone,
Anthopleura elegantissima, collected a few miles north of the Golden Gate, males
and females were shown to be distributed as unisexual aggregations on the rocks.
The degree of gonadal development was measured by taking the gonad index
(the ratio of volume of gonads to wet weight of anemone) every month for
nearly 2 years (1959 and 1960) . This showed an annual reproductive cycle, beginning
in late fall or winter, and culminating in complete spawning of the population
in late September.
Measurements of ovarian egg size during 1959 and 1960 corresponded well
with the cycle as expressed by the gonad index.
Male and female cycles were not directly comparable on the basis of the gonad
index, but identifiable males were observed over nearly the same periods as females,
producing tailed sperm during the time when ovarian eggs were near their
maximum size, and spawning at the same time.
Appears in Collections: Pacific Science Volume 18, Number 2, 1964

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