Fig. 5. Effect of anosmia on behaviour of male tilapia in the presence of pre- or post-ovulatory females. Histograms of the proportion of time spent by anosmic (filled bars) and sham-operated (open bars) males in different behavioural categories in the presence of pre-ovulatory (A) and post-ovulatory (B) females. Imm=immobile, Swim=swimming, Court=courtship, Agg=aggression, Other=other types of behaviour (see text for details). Data are shown as means ± S.E.M. (N=6). There are no significant differences between the behaviours of anosmic and sham-operated males.