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Fig. 1. Urea tissue levels in whole body R. marmoratus measured every 3 h
over a 1.5-day period (Series I). White and black bars above the graph
indicate periods of light and dark, respectively. Values are expressed as
means + s.e.m. (N=6). Columns labeled with different letters are
significantly different (P<0.05). The broken line represents the
Jurea pattern under corresponding 12 h:12 h L:D conditions
(Rodela and Wright, 2006). The
mesor of Jurea is 0.175±0.016 µmol N
g-1 h-1 and the acrophase occurs at 14:30±00:39
h.