Dictionary of Ichthyology
egg dummy = an egg-like spot, e.g. on the anal fin of mouthbrooding Cichlidae. The male cichlid displays these spots to a female who sucks at the spots assuming them to be real eggs; the male releases sperm that fertilise the eggs in the mouth of the female. Also called egg spots or false eggs (Paratilapia longirostris (= Haplochromis longirostris) from Boulenger's "The Fishes of the Nile").