Abstract
BY adding every day a small quantity of food to cultures of Echinometra larvæ, Onoda1 was able to grow them to full larval shape in forty days from fertilization. Mortensen2 succeeded in growing larvæ of the same species to metamorphosis in eighteen days. He transferred the larvæ every day, by means of a pipette, to fresh seawater, thus giving them access of their natural food. Using Mortensen's method, but transferring the larvæ to fresh sea-water twice a day, I have been able to grow them to metamorphosis in twelve days only. Attempts are being made to rear these and other larvæ in order to find the minimum duration of the larval stage; the results will be published elsewhere.
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References
Onoda, K., Jap. J. Zool., 6 (1936).
Mortensen, Th., Mem. Acad. Sci. Copenhagen, ix, 4 (1937).
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EL-DUWEINI, A. Duration of the Larval Stage of Echinometra. Nature 155, 207 (1945). https://doi.org/10.1038/155207a0
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DOI: https://doi.org/10.1038/155207a0
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