Do oysters get cold feet in Sweden? A preliminary report on winter tolerance of Ostrea edulis, Linné, from the Swedish west coast (Abstract)
Rödström, E.M. (1989). Do oysters get cold feet in Sweden? A preliminary report on winter tolerance of Ostrea edulis, Linné, from the Swedish west coast (Abstract), in: De Pauw, N. et al. (Ed.) Aquaculture: a biotechnology in progress: volume 1. pp. 361
In: De Pauw, N. et al. (1989). Aquaculture: a biotechnology in progress: volume 1. European Aquaculture Society: Bredene. ISBN 90-71625-03-6. 1-592 pp., more
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Document type: Conference paper
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| Abstract |
During the last few years a growing interest for culturing the European oyster ( Ostrea edulis, Linné) on the Swedish west coast have emerged. In Sweden Ostrea edulis lives near the northern limit of its distribution. Hydrographical conditions can be severe for oyster populations due to great variations in salinity and temperature. Especially during winter and early spring the oysters may often experience both low temperatures and low salinities survival percentage of oyster spat to commercial size is of interest for a growing Swedish oyster industry. The feeding activity in relation to low temperature and low salinity of adult oysters was recorded. The feeding activity was measured as the faecal production during 24h after feeding. Adult oysters from Sweden were compared with imported Norwegian ones. The genetic relationship between populations from Sweden and Norway were analysed electrophoretically, and the survival of juvenile oysters in low temperatures and salinities was investigated. The faecal production declined both with lower temperature and lower salinity. Preliminary results indicate differences in feeding activity between Swedish and Norwegian oysters. Swedish oysters show relatively higher activity under low temperature and salinity conditions. The preliminary results from the electrophoretic analysis indicate some difference between Swedish and Norwegian stocks. The results from survival experiments of juveniles in different salinities and temperatures indicate that survival for at least a couple of weeks in low temperature and salinity is possible. The most critical condition, with the highest procentual mortality, appears to be a combination of higher temperature (8°C) and low salinity «24%.). Comparison of the results obtained with hydrographical field observations, suggest that Swedish oysters are well adapted to the prevailing conditions. May to June seems to be the most critical period when the water temperature rises and the salinity decreases. The survival should, however, be sufficient from a commercial point of view. The implications of this fact are discussed. |
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