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Figure 3


Fig. 3. Rates (µmol 12 h-1 g-1) of ammonia (A) and urea (B) excretion in Himantura signifer at 12-h intervals during a period of 36 h post-feeding. Open bars represent fish kept in 1{per thousand} water (control; N=5). Filled bars represent fish kept in 15{per thousand} water (N=5). Values are means ± s.e.m. *Significantly different from the corresponding control value.