Tremendous hatching of the black midge (Chironomus anthracinus) took place in Lake Hald Sø, Denmark, in April after restoration with oxygen was initiated. This film was made in the Spring 1992.
Untraditionel methodes used in executing hydrographic and biological sampling from unsafe ice on frozen fjords.
Visual documentations of biological services executed by NATURFOCUS
More stuff from “Biological services”
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