Male behaviour and egg production recorded during experimental trials (mean and one standard error).

<p>The incidence of chasing (a), consent spawning (b), forced spawning (c), and the mean number of eggs recovered (d) are shown for each parental combination (FF = male <i>N. furzeri</i>×female <i>N. furzeri</i>, OO = male <i>N. orthonotus</i>×female <i>N. orthonotus</i>, FO = male <i>N. furzeri</i>×female <i>N. orthonotus</i>, OF = male <i>N. orthonotus</i>×female <i>N. furzeri</i>) and period of isolation (24 h: white bars, 72 h: black bars).