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A pregnant Southern platyfish. Pregnancy has been traditionally defined as the period of time eggs are incubated in the body after the egg-sperm union. [1] Although the term often refers to placental mammals, it has also been used in the titles of many international, peer-reviewed, scientific articles on fish.
Most fish species spawn eggs that are fertilized externally, typically with the male inseminating the eggs after the female lays them. These eggs do not have a shell and would dry out in the air. Even air-breathing amphibians lay their eggs in water, or in protective foam as with the Coast foam-nest treefrog, Chiromantis xerampelina.
The fish family Syngnathidae has the unique characteristic whereby females lay their eggs in a brood pouch on the male's chest, and the male incubates the eggs. [25] Fertilization may take place in the pouch or before implantation in the water. Included in Syngnathidae are seahorses, the pipefish, and the weedy and leafy sea dragons. [26]
Some fish have evolved to exploit the mouthbrooding behaviour of other species. Synodontis multipunctatus , also known as the cuckoo catfish, combines mouthbrooding with the behavior of a brood parasite : it eats the host mouthbrooder's eggs, while spawning and simultaneously laying and fertilizing its own eggs.
Livebearers are fish that retain their eggs inside the body and give birth to live, free-swimming young. They are especially prized by aquarium owners. They are especially prized by aquarium owners. Among aquarium fish, livebearers are nearly all members of the family Poeciliidae and include: guppies , mollies , platies and swordtails .
Betta, or Siamese fighting, fish are among "the most popular freshwater aquarium fish in the world," PetMD reports.Native to southeast Asia, this species is known for its range of vibrant hues ...
Generally speaking, cats like to eat fish. In fact, at one point, domestic felines were eating more...
Breeding generally occurs during flood season, during which time males prepare a pit nest. [1] One or more females may use the same pit nest, into which they lay their eggs. [ 1 ] The female(s) then leaves the nest and the male guards the nest from attack for the next 8 weeks; in addition, he regularly fills the nest with air to ensure that the ...