A rheological model for liquid‐filled capsules made of biomaterials was formulated, wherein theoretical equations for capsule pressure‐deflection, relaxation and creep, allow parametric fitting to experimentally obtained curves. The line taken establishes a realistic link between the theoretical model and the experimental data. Special apparatus and computer programs were developed for measuring and recording rheological properties of small capsules made of biomaterials, such as caviar or liquid encapsulated by Chitosan. The technique may be used for improving texture design and simulation of imitation caviar, or serve as a rapid means for commercial classification of caviar and caviar substitutes. The methodology may also serve for quantifying rheological properties of liquid drugs encapsulated in Chitosan, as a vehicle for continuous controlled drug apportioning. It may also be utilized for measuring rheological properties of similar capsular structures found in other living organisms.