 Females have also been observed producing larger eggs for larger, hence more ‘attractive,’ males.Females are also able to increase egg size even after the onset of egg maturation if they encounter a new, larger male to brood its eggs.Male Banggai cardinalfish also exhibit preference by size, as larger females tend to lay larger eggs, and egg size positively affects traits such as offspring size, survival, growth, time until maturation, and swimming performance.