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Lake eutrophication often causes declines and even losses of submerged macrophytes through the shading effects of increased periphyton and phytoplankton. The Chinese swamp shrimp  Neocaridina denticulata sinensis  Kemp (Decapoda, Atyidae) is a common omnivore in Chinese lakes, where its presence may impact both periphyton and phytoplankton, with previously unstudied consequences for submerged macrophytes. Here, using a mesocosm experiment, we studied the effect of  N. d. sinensis  on periphyton, phytoplankton and the submerged macrophyte  Vallisneria denseserrulata.  Results showed that in the presence of  N. d. sinensis , the biomass of periphyton on the leaves of  V. denseserrulata  was significantly reduced, and that growth rate of  V. denseserrulata  increased. The presence of  N. d. sinensis  also significantly increased the total phosphorus concentrations in the water column and phytoplankton biomass (chlorophyll- a ). The enhanced growth of  V. denseserrulata  is likely to be linked to improved light harvesting due to the reduced periphyton attached to their leaf surface. The results suggest that stocking with Chinese swamp shrimps may enhance the development of macrophytes in eutrophic shallow lakes.

Omnivorous shrimp Neocaridina denticulata sinensis enhances the growth of submerged macrophyte Vallisneria denseserrulata