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Breeding of the Chilean Oyster (Ostrea Chilensis Philippi) in the Laboratory

1963; Nature Portfolio; Volume: 197; Issue: 4868 Linguagem: Inglês

10.1038/197676a0

1476-4687

Peter Walne,

Aquaculture Nutrition and Growth

l """"HE 194~ Lund University Expedition to Chile' collected samples of OstTea chilensis from the northern part of the Golfo de Ancud and in the neighbouring Bahia de Ancud, where they were found on stony beaches and on sand and mud down to depths of 11 m.In one of the samples collected in N ovembor 1948, several Rpecimens brooding eggs and larv:.e were found which were stated to measure 0•5-0•75 rnm and 0•7-1•2 mm respectively.This is abnormally largo for Ost1•ea eggs and larv:.e and suggested that all the larval development would occur while being brooded in the mantle cavity and that tho duration of the planktonic stage would be very short.A similarly reduced planktonic stage has been recently reported for the New Zealand oyster, 0. lutaria 2 • A consignment of 0. chilensis was received in good condition in this laboratory on September 17, 1962, and placed in glass tanks with running sea-water.Within a few hours a number of early embryos were aborted.indicating that some of the oysters were brooding when they arrived.Four liberations of larv:.e were obtained in October during which period the temperature of the water gradually decreased from 15° to IF C.This range is approximately that found in the late spring and early summer on their natural grmmds 3 • Thirteen liberat.ionsoccurred in November when the temperature waR being maintained at ll 0 -14° C.The larv:.e at liberation had a well-developed foot and t•yespot, and most.lymetamorphosed within a few hours on the glass and slate sides of the tank and on mussel shells suspended for spat collection in the tank.The shell shape agreed with that figured by Ranson• although the size was less than that estimated by Soot-Ryen'.The mean and range of shell-length of six liberations are given in Table I.