EUGLENA

 Euglena is a single-celled organism that possesses a whip-like flagellum or tail that allows it to migrate up and down in the water column. Hence, blooms or surface scum will often be more noticeable in the mornings or evenings and diminish during the middle of the day when the suns light is more intense. Blooms take the form of a surface scum that varies from red, to yellow-green to lime. This type of infestation often occurs in nutrient-rich ponds such as farm and aquaculture ponds that receive a high influx of nutrients.