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Adaptations to life in an estuary include a wide salinity tolerance, an extremely efficient osmoregulatory and respiratory physiology. These adaptive mechanisms are energy-consuming and relatively little data is available on the combined effects of abiotic stress factors on the energy metabolism of mysid shrimp. A new methodology (cellular energy allocation, CEA) to assess the energy budget was adopted for the estuarine crustacean Neomysis integer (Crustacea: Mysidacea). The biochemical composition of N. integer was determined: protein (7.39±1.81% wet weight), lipid (3.99±1.05% ww) and sugar (0.42±0.18% ww). To assess the effect of natural variability on the energy metabolic processes in N. integer, a fractional factorial test design was set up with different naturally (Westerscheldt estuary, The Netherlands) occurring combinations of temperature, salinity and dissolved oxygen. The different abiotic factors …