Fig. 11. Effectiveness factor as functions of rate and diffusion distance compared with the experimental data. The ATPase rate constant k₁ is fixed for all species and size classes, where k₁=0.008 s^–1. Here, k₂ was varied to generate the various rates, and the intermediate O₂ concentration of 7.85 µmol l^–1 was used for both cases. The unbroken lines connect the juvenile and adults of each species, where the circles are P. pugio, the triangles are Penaeus spp., and the squares are P. argus. Note that decreases for each species as the animals grow.