Little is known about the mating systems of ocean fish, although they are thought to have paired courtship (Muus,1964; Hutchins, 2004). Some individuals are thought to spawn in the Sargasso Sea.
Little is known about the breeding behaviors of ocean sunfish. Off the coast of Japan, spawning is thought to occur between August and October (Nakatsubo et al., 2007). Female ocean sunfish can produce over 300 million eggs each breeding season, making them the most fecund extant vertebrate (Bass et al., 2005). Their eggs are very small, with an average diameter of 0.13 cm (Pope et al., 2010).
Range number of offspring: 300,000,000 (high) .
Little is known regarding parental investment of offspring in ocean sunfish.
- Bass, A., H. Dewar, T. Thys, J. Streelman, S. Karl. 2005. Evolutionary Divergence among lineages of the Ocean Sunfish family, Molidae (Tetraodontiformes). Marine Biology, 148: 405-414.
- Hutchins, M. 2004. Tetraodontiformes. Pp. 477-478 in Grzimek’s Animal Life Encyclpedia, Vol. 5 fishes II, 2nd Edition. Detroit: Thompson Gale.
- Muus, B. 1964. . Collins Guide to the Sea Fishes of Britain and North-Western Europe. London: Collins Clear-Type Press.
- Nakatsubo, T., M. Kawachi, N. Mano, H. Hirose. 2007. Spawning Period of Ocean Sunfish Mola mola in water of the eastern Kanto region, Japan. Aquaculture Science, 55/4: 613-618.
- Pope, E., G. Hays, T. Thys, T. Doyle, D. Sims, N. Queiroz, V. Hobson, L. Kubicek, J. Houghton. 2010. The biology and ecology of the ocean sunfish Mola mola: a review of current knowledge and future research perspectives. Reviews in Fish Biology and Fisheries, 20/4: 471-487.