回流水槽におけるカワムツ群の分散度と水質

概要

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In a preliminary observation on the schooling behaviour of three kinds of river fish, Zacco Temmincki, Tribolodon hakonensis, and Morco steindachneri, which were composed of three fish each, it was found that the school of Z. temmincki showed the most concentrated schooling behaviour at a certain position in the water trough, when it was streaming, compared with the other two kinds of fish. Using this behaviour of Z. temmincki, the relation between the degree of dispersion of the school and the water quality was examined and the following results were obtained. The degree of dispersion of the Z. temmincki was obviously affected by the water samples taken from three stations of the Tama river; the upper, middle and lower streams, and it was also found to be affected by the difference of water quality caused by the degree of synthetic detergent ABS contained, from 2.5ppm to 20ppm, and the effect of ABS is recognizable from 2.5ppm.
公益社団法人日本水産学会の論文