Very rarely spawned in aquaria. As far as known, eggs are scattered over coarse gravel and develop in the gaps between pebbles, with no parental care.
Wild groups are imported; pairing is not controlled in home tanks.
Species has no reliable captive spawning method; hobby spawnings are rare and unplanned.
Unknown in captivity; seasonal rain-type changes are suspected in the wild.
In the one documented spawning (Dickmann 2001, fish then called G. punctulatus, now G. scitulus) at least 100 tiny (<1 mm) sinking, non-adhesive eggs hatched in about 3 days.
Not documented in aquaria.
Females are larger and heavier-bodied (clearest seen from above or below). Males have a large glandular scale at the pelvic-fin base and, in G. ctenocephalus, tubercles on the head and pectoral fins.