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Free Content Contributions to the Biology of the Sea Urchin Tripneustes Ventricosus

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The growth of Tripneustes ventricosus (Lamarck) was studied using three methods; tagging, penning, and size-frequency analysis. Young urchins (smaller than 30 mm) were found mainly during summer. Growth was rapid during the first year, with the urchins reaching a mean size of about 75 mm by the following summer. There was no indication of growth in the adult population during the summer. Gonads developed during the fall at a test diameter of about 35 to 45 mm. There was a significant departure from the 1:1 sex ratio in urchins larger than 80 mm. Gonad volume of the population indicated that there were two periods of gonad development during the year, one in winter and one in summer.

Document Type: Research Article

Publication date: March 1, 1965

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