Most eggs produced by a fish in a single spawning

Most eggs produced by a fish in a single spawning
Who
Mola mola
What
300,000,000 total number
Where
United Kingdom
When
01 January 0001

The ocean sunfish (Mola mola) produces up to 300 million eggs, each measuring about 1.3 mm (0.05 in) in diameter, at a single spawning.

Some scientists now think that the record specimen could have been a bump-head sunfish (Mola alexandrini), rather than an ocean sunfish (Mola mola), but when the egg count was conducted in the 1920s, the individual was not identified morphologically, so we cannot be certain.

Molas or ocean sunfish comprise three large oceanic fishes of the family Molidae, belonging to the same order as the puffers. The largest specimens grow over 3 metres (9 feet 10 inches) long and up to 2.3 tonnes (5,070 pounds). Molas have an unusual shaped body, which is disc-shaped with very tall dorsal and anal fins projecting from top and bottom. This gives the appearance that their short bodies end abruptly just behind their fins. Molas are grey or brownish species inhabiting temperate and tropical regions throughout the world, often found at the surface of the water. Molas feed on jellyfish, but are also known to eat other fishes and algae.