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On June 13, 1942, after a warm period, Alosa, Catostomus, Pomolobus, Salmo, Salvelinus and other fishes died in parts of the Petitcodiac, Shubenacadie, French, Waugh and John rivers. The streams affected were moderately rapid, broad, shallow and long, with spring sources. They were low from slight rainfall and in districts with relatively cloudless skies during the period. These streams showed daily minimal and maximal temperatures rising steadily (to 88½° F. or 31.4 °C.) under warm moist air conditions, which evidently reduced radiation at night more than insolation during the day.
A. G. Huntsman (Mon,) studied this question.