3.2. Crayfish competitive ability
A significant size × heterospecific presence interaction (F1,15 = 5.67, p = 0.031; Table 1) revealed that crayfish spent reduced time in the bottom patch in the presence of large fish, but not in the presence of small fish ( Fig. 3A). In addition, a significant patch × heterospecific presence interaction (F1,15 = 4.47, p = 0.05; Table 1) revealed that crayfish reduced the time spent in the bottom patch in the presence of fish only when the feed was supplied exclusively in that patch ( Fig. 3B). The results for mean time per visit were similar to those for total time spent in the bottom patch ( Table 1).