Haemolymph characteristics of a copper-tolerant decapod Orconectes virilis (Hagen) (Astacidae, Crustacea).

The mean haemolymph volume in a copper-tolerant, intermoult (C2-C4) adult (more than a year old) Orconectes virilis, as determined by [14C-carboxylic] inulin dilution method, ranged from 61.17 microliters in females (mean wet body weight = 4.34 g; mean carapace length = 4.43 cm) to 61.79 microliters in males (mean wet weight = 5.73 g; mean carapace length = 4.49 cm). The mean haemolymph volume per cent varied from 14.5 (in females) to 31.1 (in males). Haemolymph from males had an average pH of 7.35, osmotic pressure of 414.1 mmol/kg H2O, and a specific gravity of 1.0603, while that from females averaged a pH of 7.48, osmotic pressure of 433.6 mmol/kg H2O and a specific gravity of 1.0469. Mean total haemocyte counts ranged from 3,434/mm3 (1,000/mm3 halinocytes, 1,125/mm3 hemi-granulocytes and 1,309/mm3 granulocytes) in males to 4,905/mm3 (1,525/mm3 halinocytes. 1,490/mm3 hemi-granulocytes and 1,890/mm3 granulocytes) in females.

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