The Importance of Bacteria in Laboratory Experiments on Rearing the Larvae of Ostrea Edulis (l.)
نویسنده
چکیده
Observations made by the writer during the summer of 1955 suggested that the density of the bacterial flora which develops when oyster larvae are reared in small glass vessels is inversely correlated with the number of spat settling (Walne,1956). From the nature of the observations it could not be determined whether the bacteria were affecting the development of the larvae or whether the properties of the sea water which resulted in a dense bacterial population were unfavourable to larval growth. This was clearly a matter which required further investigation. Investigators rearing marine larvae have commonly found that when a standard rearing technique is employed over a period, considerable differences occur in the proportion of different broods of larvae which grow to metamorphosis. There has been no satisfactory explanation for this phenomenon, although it has been assumed to be due to the presence or absence of minute quantities of various organic compounds in the water (Wilson, 1951; Loosanoff, 1954). The observations recorded in this paper suggest that a partial explanation could be that batches of sea water differ in the number of bacteria which they will support when confined in laboratory vessels, and these bacteria in turn affect the growth of the larvae.
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