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Volume 39- Number 2 - 2004
Article


Response to genetic selection for growth rate in juveniles of Ostrea chilensis Philippi (Bivalvia: Ostreidae), maintained under laboratory conditions

Jorge E. Toro, Angélica C. Alcapán, Johana A. Ojeda y Ana M. Vergara

 

Instituto de Biología Marina “Dr. Jürgen Winter”, Universidad Austral de Chile, Casilla 567, Valdivia, Chile

 

E-mail: jtoro@uach.cl


The oyster parental stock was taken from the 1998 natural spatfall from the wild population of Ostrea chilensis at the Quempillen River Estuary, located at Chiloe Island, southern Chile. From a cohort of 34 months of age 5232 oysters were monitored for the traits shell length and live weight. Selection was carried out applying a selection intensity of +1.7 for the trait live weight, using a control group. The conditioning was carried out in 5 tanks of 120 L, 3 of them containing high selected lines and other 2 control lines of oysters. A highly significant correlation (0.76, p<0.001, N=5232) was found between the traits live weight and shell length. Spat from the 3 selected subgroups and 2 control groups were obtained. Plastic collectors with the spat attached were placed in a common rearing tank. Shell length was monitored after 6 and 16 weeks of age in 200 juveniles of each selected and control lines. The ANDEVA results show a significant difference (p<0.05) between the shell length of the selected and control groups at 6 and 16 weeks of age. Also, a significant response to selection was obtained even when selection was applied for the trait live weight at 34 m-old. These results confirm those obtained in an earlier study using the same natural oyster population from Quempillén


Key words: Genetic improvement, selection, oyster, molluscs


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1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
 
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