絶食中におけるクロゴキブリの血液量, 血糖濃度, 脂肪体量および脂肪体グリコーゲン含量の変化

抄録

The final (8th) instar larvae of smoky brown cockroach (Periplaneta fuliginosa S.) were used to determine the changes in hemolymph volume, blood sugar titer, fat body and content of glycogen in the fat body during the fast with or without water supply. The results are summarized as follows. 1. The cockroaches decreased in body weight during the fast, especially when the water supply was concurrently cut off. The cockroaches died of hunger in 25 to 60 days, and water supply would not help to prolong their life. 2. In the fast which was supplied with water, the hemolymph volume increased, and the percentage of hemolymph volume based on body weight rose to 30%. If the water supply was concurrently cut off, however, the hemolymph volume gradually decreased and the percentage-based body weight declined to below 8%. However, in the early days of the fast, the blood sugar titer was kept in a normal state whether there was any water supply or not. But when the fast had continued over 8 days, the blood sugar titer gradually declined in the treatment which was supplied with water and rose in that with the water supply cut off. 3. Fat body and content of glycogen in the fat body decreased during the fast whether there was any water supply or not. The content of glycogen in normal larvae was about 11-13mg/g, but after 28 days of the fast, it declined to 1mg/g. 4. Development of the cockroaches remained stagnant during the fast. But when supplied with food and water again, even the larvae of cockroach which had fasted for 32 days revived and grew to adult.