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Fig. 4. Urination rates of male tilapia in isolation and in the presence of pre- or
post-ovulatory females. Histograms showing the rates of urination of
sham-operated (A) and anosmic (B) males in isolation (control; open bars) and
in the presence of a pre-ovulatory (black bars) or post-ovulatory (grey bars)
female (N=6). Different letters indicate significant differences
(P<0.01).