Nature
This fish lays more eggs in one go than any other vertebrate on Earth
A single female ocean sunfish, Mola mola, can release an estimated 300 million eggs in one spawning, the highest fecundity known in any vertebrate. Almost none survive to adulthood; the sunfish's strategy is pure numbers rather than parental care. Adults can weigh over a tonne despite starting life as a larva barely bigger than a grain of rice.