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Fig. 3. Semi-logarithmic plots of pooled normalized electro-olfactogram (EOG)
amplitudes recorded from male tilapia (N=6) in response to pooled
urine (A), faeces (B), plasma (C) and bile fluid (D) from pre-ovulatory
(filled circles) and post-ovulatory (open circles) females. Comparison of the
regression lines revealed significant differences between the elevations (but
not the slopes) of the response to urine from pre- and post-ovulatory females
and between the elevations (but not the slopes) of the response to faeces from
pre- and post-ovulatory females. No differences were found between the
responses to plasma (P=0.845) or bile (P=0.923) from pre-
and post-ovulatory females. Estimated thresholds of detection are given in the
text. *P<0.05; ***P<0.001.