THE EFFECT OF THERMAL STRESS EXPOSURE ON THE HEMOLYMPH GLUCOSE LEVEL IN CRABS (CARCINUS ESTUARIS)

Organisms in natural habitats must frequently respond to changes in their environments through various physiological mechanisms. One of them is hyperglycemia which is a typical response of many aquatic animals to different aquatic factors. The mechanism of hormone release in crab Carcinus estuaries is the central objective of this study. Two groups divided into normal and eyestalk-ablated animals, composed of 6 animals were exposed to different value of temperature for 2 hour and it was observed that the glucose level changes in normal animals according to the temperature. From the experimental results is shown that the normal temperature for animals is near to 22.6°C. That’s why exposure of both: intact and eyestalk-ablated animals to this temperature doesn’t cause any significant effect. It causes a slightly increase of glucose level into intact crabs (F=0.375, df=1, 10, p=0.573 so p>0.05) while into the eyestalk-ablated animals a slightly decrease, (F=1.143, df=1, 10, p=0.345 so p>0.05). While the exposure of animals to the temperature 32°C, causes a drastically increase of the glucose level in normal animals (F=52.46, df=1, 10, p=0.000 so p<0.05) and a non significant decrease to eyestalk-ablated animals (F=4.17, df=1, 10, p=0.055 so p>0.05). When animals were exposed to the temperature 4°C, the glucose level of intact animals is drastically increased, (F=18.06, df=1, 10., p=0.002 so. p<0.05) while into the eyestalk-ablated animals, the glucose level undergoes to a non significant slightly decrease. (F=3.35, df=1, 10, p=0.97 so p>0.05).