Article on the discovery:  a synthetic surfactant slows down water filtration rate and feeding of rotifers (zooplankton). Joint Russia-Germany research project.
The full text is available online free:

https://vk.com/club139094261 ;

Rotifers.-Ostroumov-S-A-Effect-of-Surfactant--on-Rotifers-Dokl-Biol-Sci-2003--390--252-255.pdf