Revista de biología marina y oceanografía
versão On-line ISSN 0718-1957
TORO, Jorge E; ALCAPAN, Angélica C; OJEDA, Johana A e VERGARA, Ana M. Response to genetic selection for growth rate in juveniles of Ostrea chilensis Philippi (Bivalvia: Ostreidae), maintained under laboratory conditions. Rev. biol. mar. oceanogr. [online]. 2004, vol.39, n.2, pp. 53-59. ISSN 0718-1957. doi: 10.4067/S0718-19572004000200002.
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
Palavras-chave : Genetic improvement; selection; oyster; molluscs.