東海地方の養鰻池に於ける水色,透明度等の季節的変化と粒子組成より見た植物性プランクトン

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The thriving of phytoplankton is believed as one of the most important factors concerning directly to the daily appetite and respiration of fishes in the eel-culture ponds. The author had deviced a new method to denote the degree of phytoplankton thriving by the measurements of the transparency using a small china disc, and also, had cleared to specify and notate the water-color numerically by the Munsell Color System. Using these new methods, I have studied on the seasonal variation of phytoplankton thriving and its particle size in many eel-culture ponds. The results so far are as follows: (1) Chlor content, transparency and water-color of pond waters in five main eel-cultural districts in Shizuoka, Aichi and Mie Prefectures are summarized on Fig. 1. (2) Respective characteristics of plankton thriving in the ponds of these districts are compared with each other and seasonally by plotting the ratio of chlor content, transparency and hue value of water-color on the triangular co-ordinates (Fig. 2, 3). (3) While phytoplankton of a minute particle dominates in the ponds in which chlor content of water is higher, relatively macro-sized plankton colony thrives in the fresh-water ponds and especially in the warmer season.
公益社団法人日本水産学会の論文