抄録
The author has done those experiments continously for the former report (Refference 1) which was carried out the effect of colour vinyle cord as a model net on drive to fish.
10 goldfish Carassius auratus of an average total length of 3.5cm. were liberated in a wooden tank of 50cm. long, 26cm. wide and 10cm. water depth. A pair of model nets are prepared which wooden frames are stretched netting of small mesh, except the middle part, because inserting three glass tubes in it, seeing Fig. 1. Observing for effect of colours, there were used red, blue and black inks to fill each glass tube, and for depth of colour, these inks were diluted in 10……1, 000 times. The centralizing method was done with repeat of 40 times using all these 11 conditions and in all combinations of two conditions each.
The sum of the total values were given in Table 1. and they were applied the chi-square test of statistics and the visible distance of the glass tubes in the water were given in Table 2.
Even the driving effect is in being of difference by kinds of colours, he recognized superiority and inferiority of the effect according the depth of colour in the same. The visible distance of those glass tubes in the water was coincided with the order of depth of colour, neverthless the colour more visible in the water is not always excellent on the driving effect. As coincide with the result of the former report, the red ink of non-dilution is most excellent on driving effect.
To sum up of those conception, he thinks over that the distinctness with kind and depth of colour is excellent on driving effect.
