Mean feed intake per fish per meal (g fish−1 meal−1) and feed
intake as percentage of body weight per meal (% meal−1) and per
metabolic weight unit per meal (g kg−0.8 meal−1) over the ALFP
(Table 3) were significantly different between morning and afternoon
meals (Pb0.05). There was an interaction effect of meal time and
oxygen (Pb0.01), but no interaction effect of meal time and fish size
(PN0.05). Multiple comparisons showed that feed intake in the
morning was significantly lower than in the afternoon at high oxygen
level (Pb0.01). At low oxygen level, however, no effect of meal time
on feed intake was found (PN0.5), although feed intake in the morning
was numerically higher than in the afternoon (Fig. 3).