Figure 2.

Frame by frame optic flow parameters of control and treatment embryos for each of the developmental stages of Danio rerio, Xenopus laevis and Radix balthica. Red – positive angle movements, blue – negative angle movements, green – X coordinate of centre of mass, yellow – Y coordinate of centre of mass. A time period (Danio rerio – 10 min, Xenopus laevis – 10 min, Radix balthica – 5 min) of a single embryo is shown, exhibiting typical movement patterns for each treatment response per developmental stage.