Hydrological and Hydrobiological Observation of the Tikuma River. III

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概要

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• 1. Influence of rain-water and thaw is observed. Directly after rain, Cl, N2O5-N and Consumption of KMnO4 increase, and Organic-N decease. Other elements, especially P2O5, are diluted at first show a tendency to increase for 1-3 days after rain. Only SiO2 is affected little. 2. Phytoplankton and sessile micro-plants growing on a cube of Cement (5×5×5cm) are determined by Harvey's pigment method at every three weeks from Nov. 1941 to Oct. 1942. These results are illustrated by following figures. Relation of quantity of pingent and precipitating volume, growing velocity, required nutrient salts are discussed. In June plants show the maximum growth, and sessile plants require 1mg P2O5, 300mg SiO2 and 3mg N per a square meter a day.

• 社団法人 日本水産学会の論文

著者

• 花岡 資

  水産試験場

関連論文

• Hydrological and Hydrobiologial Observation of the Tikuma River
• Hydrological and Hydrobiological Observation of the Tikuma River. III
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• Amount of Food Protein and the Accumulation of Body Protein in Fish:III. Economical Amount of Food Protein
• Amount of Food Protein and the Accumulation of Body Protein in Fish:IV. Influence of Some Feeding Conditions on the Growth of Fish

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