Abstract
This is a study on how the body-color of Japanese porgies (Pagrosmus major T. & S.) is affected by baits that are given to them, the major points of which are as follows:
After the writer had put some porgies in pisciculture ponds covered with sunshades and had turned their body-color to black, he fed them with sand-lance (Ammodytes personatus), red-shrimp (Penacopsis akayebi), and oyster (Ostres gigas) for 40 to 101 days. As a result, it was observed that the group which was given red-shrimps as baits was the only ones that resumed their natural color of red after the porgies had their body-color once changed to black. It seems probable that the red pigments of the red-shrimps have some close connection with this phenomenon. However, I think it is a very interaesting fact.
