Role of biochemical energy reserves in the metamorphosis and early juvenile development of the oyster Ostrea chilensis |
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Authors: | J A Videla O R Chaparro R J Thompson I I Concha |
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Institution: | (1) Instituto de Biología Marina Dr. Jurgen Winter, Universidad Austral de Chile, Casilla 567, Valdivia, Chile Fax: +56-63-221 455 e-mail: ochaparr@valdivia.uca.uach.cl, CL;(2) Ocean Sciences Centre, Memorial University of Newfoundland, St. John's, Newfoundland A1C 5S7, Canada, CA;(3) Instituto de Bioquímica, Universidad Austral de Chile, Casilla 567, Valdivia, Chile, CL |
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Abstract: | Metamorphosis in the Chilean oyster Ostrea chilensis was complete 36 h after release of the larvae, when 100% of the individuals showed edge growth of the dissoconch. The size
of the larval shell did not change during metamorphosis, although the total dry weight of the larva decreased considerably.
During this period, when the gill ciliature was undeveloped and the oyster therefore unable to feed, energy demands were met
by biochemical reserves retained from the larval phase. Proteins contributed the largest quantity of energy to the metamorphosing
oyster, 69.3% of the total expended, whereas lipids supplied 24.3% and carbohydrates only 6.4%. The process of metamorphosis
consumed 64.5% of the energy reserves held by the pediveliger at the time of release. When metamorphosis was complete, growth
began and tissue reserves were replenished, protein and carbohydrate accumulating rapidly early in the juvenile stage.
Received: 26 December 1997 / Accepted: 8 July 1998 |
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