Fig. 1: Difference in observed and predicted search depth in the altered pressure phase.
From: Fish can use hydrostatic pressure to determine their absolute depth
a Difference between the search depth we observed and the search depth we predicted according to the change in hydrostatic pressure in all 30 tests. A difference of zero means fish searched where we predicted according to hydrostatic pressure. b Stills from recorded footage of an individual during the fixed pressure phase (left) and the altered pressure phase (right) where we added 15 cm of water and observed the fish respond by searching 15 cm higher in the tank, as predicted.
