抄録
In an attempt to toxicity of some substances to aquatic animals, linearly arranged five pots supplied with running water were used (Fig. 1). Any change of behaviour of the experimental animals in them when exposed to waterborne toxic substances was noted against uormal conduct of the controls. Evaluation of toxicity was done by adding different weights on different signs of vector as revealed by locomotion of the animals in question and also on time required for the conduct.
Toxicity was read in terms of minutes in reference to poisoning (Fig. 3). Threshold toxic concentration was graphically determined (Fig. 3). The limens for the teleost, Oryzias latipes, were found 1/16000000 CuS04, 1/15000000 KCN, and 1/1050000 NaOH.
