Cold hardiness of the eggs of the plaice,Pleuronectes platessa |
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Authors: | Arne V. Aarset Leif Jørgensen |
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Affiliation: | (1) Department of Zoology, University of Trondheim, N-7055 Dragvoll, Norway;(2) Division of Applied Chemistry, Group of Aquaculture, SINTEF, N-7034 Trondheim, NTH, Norway |
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Abstract: | Summary The pelagic eggs of the plaice, Pleuronectes platessa, at the stage of first heart beat, can tolerate freezing into solid sea ice at temperatures down to-6°C. A long term freezing period of 5 days, at sublethal temperatures of-3 to-4°C, had only a minor effect on the eggs. When the ice was absent from the medium, the eggs supercooled readily to temperatures around-15° to-20°C. However, no thermal hysteresis agents were present in the eggs at low temperature and the cold hardiness therefore seem to rely on a high tolerance to brine solutions at low temperatures. |
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