We investigated the preference of Cave molly males to associate with a receptive or a non-receptive female while body contact was prevented but water-borne cues were allowed to reach the male. Both in light and in darkness, males did not prefer the receptive female. Water-borne chemical cues (pheromones) seem to be absent or they are not detected/used by males, respectively.Istraživali smo način na koji mužjak špiljske ribe Poecilia mexicana odabire receptivnu odnosno nereceptivnu ženku, pri čemu je tjelesni kontakt bio onemogućen, ali su čimbenici nošeni vodom mogli doprijeti do mužjaka. Niti na svjetlu niti u tami mužjaci nisu preferirali receptivne ženke. Proizlazi da vodom nošenih tvari (feromona) nema, ili ih mužjaci ne raspoznaju, odnosno ne koriste