Figure 1. The changes in the body equilibrium of tilapia and zebrafish over time at 8 °C.

Tilapia immediately lost body equilibrium when water temperature declined to 8 °C, whereas zebrafish maintained body equilibrium for the first 12 h at 8 °C. Twelve hours after loss of equilibrium, tilapia died, whereas zebrafish began to show equilibrium loss. The different body postures are indicated by different colors: black for normal equilibrium, red for loss of equilibrium, and blue for death. The sampling points are indicated by the arrows.