Out of curiosity, which book is this? Obviously
the author has never read the only detailed study
on family structure in Apistogramma published in a
scientific publication that I can recall right
now:
Burchard, J. E. Jr. 1965. Family structure in the
dwarf cichlid Apistogramma trifasciatum (Eigenmann
and Kennedy). Zeitschrift für Tierpsychologie. 22:
150-162.