U svakom slučaju na početku ispitivanja bilježi se izgled ispitnog medija (npr. jasan, mutan itd.).
Ratte, M., H. Ratte (2014), “Myriophyllum Toxicity Test: Result of a ring test using M. aquaticum and M. spicatum grown in a water-sediment system”, OECD Environment, Health and Safety Publications (EHS), Series on Testing and Assessment, No.