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Figure 5


Fig. 5. Urea excretion (Jurea) (A) and ammonia excretion (Jamm) (B) in food-deprived Danio rerio exposed to a 12 h:12 h light:dark period (Series V). White and black bars above the graph indicate periods of light and dark, respectively. Values are expressed as means ± s.e.m. (N=8). Neither Jurea nor Jamm demonstrated a significant rhythm (F2,9=2.33, P=0.15, F2,9=1.28, P=0.33).