Strain differences in zebrafish novel tank diving test behavior. Different strains of zebrafish used in this study: (A) display specific patters of their exploratory behavior, as illustrated by representative phenotypic variations in swimming behavior for 3 min, (B) and behavioral endpoints and (C) analyzed using video-tracking software (CleverSys Inc.). *P < 0.05, **P < 0.01, ***P < 0.005 vs. wild type strain, U-test.