Food competition experiment between F
fish larvae, in the light or in the dark. (A) Diagram of the experimental design. (B) Plot showing the distribution of eye sizes in survivors (only 15% of the 200 initial larvae) after 10 days of competition for very limited amounts of food (about five Artemia larvae per fish every third day). The two groups of F2s have similar eye sizes (P = 0.388; Wilcoxon test).