Fish Sexual reproduction

the vast majority of fish species lay eggs fertilized male, species lay eggs on substrate rock or on plants, while others scatter eggs , eggs fertilized drift or sink in water column.

some fish species use internal fertilization , disperse developing eggs or give birth live offspring. fish have live-bearing offspring include guppy , mollies or poecilia. fishes give birth live young can ovoviviparous, eggs fertilized within female , eggs hatch within female body, or in seahorses, male carries developing young within pouch, , gives birth live young. fishes can viviparous, female supplies nourishment internally growing offspring. fish hermaphrodites, single fish both male , female , can produce eggs , sperm. in hermaphroditic fish, male , female @ same time while in other fish serially hermaphroditic; starting 1 sex , changing other. in @ least 1 hermaphroditic species, self-fertilization occurs when eggs , sperm released together. internal self-fertilization may occur in other species. 1 fish species not reproduce sexual reproduction uses sex produce offspring; poecilia formosa unisex species uses form of parthenogenesis called gynogenesis, unfertilized eggs develop embryos produce female offspring. poecilia formosa mate males of other fish species use internal fertilization, sperm not fertilize eggs stimulates growth of eggs develops embryos.