Abstract
The concentration of oxygen in the microenvironment of the developing fish egg is always less than the concentration in the supply water. Mass transfer theory is the theoretical tool for understanding the importance of the oxygen content and the velocity of the supply water as factors influencing oxygen uptake of fish eggs. The applicable literature on mass and heat transfer is reviewed and formulas for the calculation of oxygen depletion in the boundary layer surrounding the egg are suggested. Calculated dissolved oxygen requirements for eggs of two fish species at various water velocities are compared with experimentally determined dissolved oxygen requirements.

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