Parental care in fish
Guarding eggs and young: building nests, fanning eggs, carrying them in the mouth or on the body.
Also: bubble nest, nest building
Most fish leave their eggs, but many species care for them. Male sticklebacks build nests of plant material glued with a kidney secretion. Male bettas and gouramis blow bubble nests at the surface and guard the eggs in them. Pearlspot pairs in Kerala's backwaters guard their young in shoals. Male seahorses carry eggs in a brood pouch and give birth. Discus feed their fry on mucus from their skin. In fish, it is often the father, not the mother, who does the caring.