Influence of solar ultraviolet-B on pelagic fish embryos: osmolality, mortality and viable hatch |
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Authors: | V Dethlefsen H von Westernhagen H Tüg PD Hansen H Dizer |
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Institution: | Bundesforschungsanstalt für Fischerei, Deichstrasse 12, 27472 Cuxhaven, Germany, Alfred-Wegener-Institut für Polar- und Meeresforschung, Columbusstrasse, 27568 Bremerhaven, Germany, Technische Universit?t Berlin, Keplerstrasse 4–6, 10589 Berlin, Germany,
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Abstract: | Eggs of dab (Limanda limanda) and plaice (Pleuronectes platessa) were experimentally exposed to ultraviolet-B (UV-B) radiation in a solar radiation simulator. The experimental design tried
to simulate present and future conditions with reference to increased UV-B exposure due to northern hemisphere ozone loss,
employing mainly two scenarios, a reduction to 270 (S1) and to 180 (S2) Dobson units (DU) in single or repetitive exposures
of 2, 4 or 6 h. Depending on the total dose of UV-B irradiation and the developmental stage, exposed eggs displayed loss of
buoyancy as a sublethal effect, as well as increased embryo mortality and reduced viable hatch. In the single exposure experiments
only under conditions of 180 DU for 6 h were effects apparent. Double exposure under conditions of 270 DU did not lead to
lasting effects. At the sublethal effect level, i.e. loss of buoyancy, considerable photorepair was observed. It was concluded,
that under the present general weather conditions in spring and at the present levels of environmental ozone, allowing for
a reduction to 180 DU, the embryonic development of North Sea spring spawning fish is not endangered by UV-B radiation.
Received in revised form: 19 June 2000
Electronic Publication |
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