ACTIVITY OF GOLDFISH ON TESTICULAR SUBSTANCE DIET

Abstract

It had been observed that goldfish, when fed finely ground-up whole testicular substance of the ram, showed considerably more activity than when fed ordinary ground-up dried shrimp or other food. In order to demonstrate this graphically the apparatus (Figure I) described below was devised. In Figure I, A is a glass tray, size 12×18 cm. B is a piece of ordinary printers’ brass rule bent at right angles around the tray and projecting upward as shown in sketch. C is a wooden piece ½ cm. square carrying pieces of capillary glass tubing. D are tubes spaced at equal distances apart. These distances are slightly greater than the width of the body of the fish. C and D as a unit are arranged to swing freely between the fine steel pivot points E and E. An extension of the middle capillary tube forms the arm G, which in operation moves the recording needle H, causing it to register the movements of the fish on the smoked paper of the kymograph I. J is a guide post to keep the recording needle in correct position. Mo...