The importance of the particle selective feeding of bivalves becomes more evident and it is necessary to incorporate thisphenomenon into ecological models in order to reflect correctly the material fluxes inside the organism and ecosystem as well.The problems related to the modelling of organic matter selection are considered in this paper and a newdefinition of pre-ingestiveselection efficiency is proposed. It differs from the classical one in using the organic material fraction in ingested food insteadof pseudofaeces. The newly defined selection efficiency exhibits an advantage in simplified shape of experimental relationshipto the organic matter fraction in seston and easier derivation of formulas related to mathematical food processing formulation.
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