Fig. 8. (A) Abalone egg rotation rate and instantaneous rotational velocity as a function of fluid shear. The line is predicted from theory (see Eqn 6 and Eqn 7), and symbols (closed circles) are values obtained in experiments. Each symbol is a mean ± s.e.m.; error bars are smaller than symbol sizes in each case. (B) The flow fields surrounding an abalone egg, solved numerically (see Eqn 7 and Eqn 8) using the Navier–Stokes equation and the finite element method. Model outputs are displayed as velocity color maps for a non-rotating (Left) and rotating (Right) egg. The x and y axes are oriented parallel or perpendicular to the direction of flow, respectively. G (s^–1) is fluid shear generated in the Taylor-Couette flow tank. (C) Close-ups of flow fields shown in B.