They can also eat tubifex worms, brine shrimp, daphnia, blood worms, and smaller fish. Large and small Oscars are know to eat a lot and are also know to die from eating too much. In the wild, Oscars prey on invertebrates and smaller fish. Bigger fish eat them in the wild. The life cycle of an Oscar fish is that the females lay their eggs.
Males fertilize the eggs.
The eggs will be laid in string or in rows. Eggs hatch in a day or a day and a half. The parents' job in this process is to fan and hover over the eggs. At any point in time the parents are know to eat their eggs. Oscar is looking through the glass tank.