Haemocyanin concentration, carrying capacity and haemolymph pH under hypoxia inMesidothea entomon(L.) (isopoda, crustacea)

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Abstract
The haemocyanincontaining blood of the isopod Mesidothea entomon was investigated with regard to changes in the concentration of haemocyanin, carrying capacity (Hcy + dissolved O2) and pH under hypoxia of 10–20 torr for up to 96 h. Normoxic Hcy concentration was 0.79 mM · l−1 and after 96 h hypoxia this increased to 1.17 mM · I−1, carrying capacity changed correspondingly from 1.8 vol% to 2.19 vol%. The physically dissolved oxygen was negligible. Haemolymph pH for Mesidothea under normoxia was 7.646 at 10°C and this increased to 7.909 after 96 h under hypoxia. The results are discussed in relation to the ecology of the species.