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D-veliger larvae from Mytilus chilensis broodstocks from natural banks of Punta Arenas and Chiloe (Chile) were grown at 9 ± 0.5 oC and 15 ± 0.5 oC to compare results under two culture temperatures. During this experiment, larvae were fed Isochrysis galbana (clone T-ISO). The larvae were grouped into four groups depending on origin of broodstock and the culture temperature. The growth rate was statistically higher in the group from Punta Arenas at 15 oC, while settlement length was smaller in the group from Chiloe at 9 oC. In both cases, the remaining groups did not differ significantly. Settlement survival showed no significant differences between populations and temperatures. Both populations showed a better use of accumulated thermal units (oC day–1) during growth at 9 oC than at 15 oC. Despite the genetic differentiation of the Punta Arenas population, the productive outcome of M. chilensis larvae from broodstocks from different latitudes is similar.   Se obtuvieron larvas veliger D de reproductores de Mytilus chilensis procedentes de Punta Arenas y Chiloe (Chile), y se cultivaron a 9 ± 0.5 oC y 15 ± 0.5 oC para comparar los resultados del cultivo larvario de las dos poblaciones a dos temperaturas. Durante el experimento, las larvas fueron alimentadas con Isochrysis galbana (Clon T-ISO). Las larvas fueron cultivadas en cuatro grupos dependiendo del origen y la temperatura. La tasa de crecimiento fue estadisticamente mayor en el grupo de Punta Arenas a 15 oC, y el tamano de fijacion fue menor en el grupo de Chiloe a 9 oC. En ambos casos, los restantes grupos no presentaron diferencias significativas. La supervivencia hasta la fijacion no presento diferencias significativas entre poblaciones ni entre temperaturas. En ambas poblaciones se observo un mejor aprovechamiento de las unidades termicas acumuladas (oC dia–1) en el crecimiento a 9 oC que a 15 oC. El resultado productivo de larvas de M. chilensis generadas por reproductores de distintas latitudes es similar, pese a la diferenciacion genetica de la poblacion de Punta Arenas.

ciencias marinas

Effect of temperature on the culture of larvae of the bivalve Mytilus chilensis originated from broodstocks from different latitudes in a controlled environment