Abstract
1. The normal count of circulating hemocytes of the mole-crab Emerita asiatica was studied by taking into consideration the effects of size, time of the day and thermal stress.2. Total hemocyte counts were higher in animals belonging to size groups 26-28 mm than in size groups 22-24 mm and 30-34 mm. The water content of hemolymph did not differ among different size groups.3. Total hemocyte counts also showed variation in relation to time of day. Counts were higher in afternoon than in forenoon. The results suggested a possible redistribution of circulating hemocytes in tissues during various times of the day.4. The above suggestion was supported by the results of the effect of thermal stress on total hemocytes counts, which revealed that the counts decrease as the temperature increases. The findings are discussed in light of previous studies on hematological equilibrium in invertebrates.5. The results indicate that the life-span of hemocytes may have three phases: the phase of hemocytopoiesis; the circulating phase; and the noncirculating phase, when the hemocyte is out of circulation.
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