Abstract
‐() ‐ ‐ () ‐ () = years that the mollusk has lived. Tsikhon-Lukanina [7] suggested a method for calculating the lifespan of mollusks of different taxa based on the assumption that the animal lifespan is determined by two fundamental characteristics: the rate of food assimilation and the energy equivalent of the body weight as the final result of metabolic processes. However, the examples of calculation of the lifespan for 66 species of marine and freshwater gastropods and bivalves yield values several times higher than the observed maximum lifespans known from the literature. Despite this discrepancy, analysis of the relationship between the total metabolic energy expenditure during the lifespan of an individual and its definite size (weight) initiated by the cited study is promising for the development of “physiological” (“energy-based”) method for calculating the mollusk lifespan. It is well known that the energy dissipated during the entire vital activity and the body size that an individual reaches are interrelated by the growth efficiency coefficient ( ) calculated as the ratio of the total growth of an individual during the lifespan ( P O ) to the sum of this growth and the total metabolic expenditure during the same period of time ( R O ):
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