Table 1.

Analysis of variance

Color pair
Blue/green Blue/red Green/red
Origin of variance (%)Level of significanceOrigin of variance (%)Level of significanceOrigin of variance (%)Level of significance
Groups2.2NS4.6P<0.055.7P<0.01
Fishes15.1P<0.00128.7P<0.00114.5P<0.001
Measurements82.7-66.7-79.8-
  • Variances in the results from each pair of stimulation colors were analysed with two-level nested analysis of variance (ANOVA; Sokal and Rohlf, 1995). Most of the variance resulted from differences between individual measurements from each fish. Furthermore, there were highly significant differences between individual fishes in each rearing group under all stimulation conditions. Significant differences between rearing groups were present in the data obtained during stimulation with blue/red and green/red color pairs. NS, not significant at the 5% level.