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The Biology of Echinocardium cordatum

  • Hilary B. Moore (a1)

1. Monthly samples of Echinocardium cordatum were taken at Port Erin in 1932,1933 and 1934, and at intervals at Fairlie Sands in the Clyde.

2. Growth is continuous throughout the year with the exception of February-March. In their first winter the young urchins attain a length of about 10 mm. at Millport and 15–20 mm. at Port Erin. In their second winter they are about 20 mm. at Millport, and 30–35 mm. at Port Erin.

4. The year 1931 was cold and produced a very small brood of young urchins; 1932 and 1933 were warm years and produced very large broods.

5. The young settle below low water and migrate into the interval zone after an interval of four to twelve months.

6. The gonads of the young urchins mature in their second year. Spawning takes place in June–July–August.

7. The nutritive bodies in the ovaries are shown to be derived from the disintegration of relict ova.

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Bruce, J. R. 1928. Physical Factors on the Sandy Beach. Pt. 1. Tidal, Climatic and Edaphic. Journ. Mar. Biol. Assoc., N.S., Vol. XV, pp. 535552.
Elmhirst, R. E. 1923. Notes on the Breeding and Growth of Marine Animals in the Clyde Sea Area. Scott. Mar. Biol. Assoc. Ann. Rept. for the year 1922, pp. 1943.
Marine Biological Association. 1931. Plymouth Marine Fauna.
Miller, R. A., and Smith, H. B. 1931. Observations on the Formation of the Egg of Echinometra lucunter. Papers from Tortugas Lab., Carnegie List., Washington, Vol. XXVII, pp. 1105.
Moore, H. B. 1933. A Comparison of the Sand Fauna of Port Erin Bay in 1900 and in 1933. Proc. Malac. Soc., Vol. XX, Pt. VI, pp. 285294.
Moore, H. B. 1935. A Comparison of the Biology of Echinus esculentus in different Habitats. Pt. II. Journ. Mar. Biol. Assoc., N.S., Vol. XX, pp. 109128.
Pirrie, M., Bruce, J. R., and Moore, H. B. 1932. A Quantitative Study of the Fauna of the Sandy Beach at Port Erin. Journ. Mar. Biol. Assoc., N.S., Vol. XVIII, pp. 279296.
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Journal of the Marine Biological Association of the United Kingdom
  • ISSN: 0025-3154
  • EISSN: 1469-7769
  • URL: /core/journals/journal-of-the-marine-biological-association-of-the-united-kingdom
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