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In this study, we used a macrophyte model to describe the growth production and the interaction between above- and below-ground organs of Potamogeton pectinatus in Lake Burullus, Egypt. Above- and below-ground biomass of P. pectinatus was sampled on a monthly basis from April to December 2011 at three sites of Lake Burullus. Shoots started to grow in April, reached the maximum biomass in September and then rapidly decreased in October when they moved into the senescence stage. Tubers biomass reduced in August due to the upward translocation to shoots, but sharply increased to the maximum in October by downward translocation from shoots and roots. Potamogeton pectinatus allocated approximately 82.3% of its total biomass to shoots, 15.5% to tubers and 2.2% to roots. [ABSTRACT FROM AUTHOR]