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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.
Zenarchopteridae, the viviparous halfbeaks, is a family of ray-finned fishes in the order Beloniformes. The Zenarchopteridae exhibit strong sexual dimorphism , practicing internal fertilisation , and in some cases ovoviviparous or viviparous (the family also includes oviparous species).
The halfbeaks' fossil record extends into the Lower Tertiary. [2] The earliest known halfbeak is "Hemiramphus" edwardsi from the Eocene at Monte Bolca, Italy. [4] Apart from differences in the length of the upper and lower jaws, recent and fossil halfbeaks are distinguished by the fusion of the third pair of upper pharyngeal bones into a plate. [5]
Hemiramphus far, the halfbeak, black-barred halfbeak, black-barred garfish, barred halfbeak, barred garfish or spotted halfbeak, is a schooling marine fish belonging to the family Hemiramphidae, the halfbeaks. It has an Indo-Pacific distribution and has invaded the eastern Mediterranean through the Suez Canal.
This has been observed primarily among sharks such as the shortfin mako and porbeagle, but is known for a few bony fish as well such as the halfbeak Nomorhamphus ebrardtii. [12] An unusual mode of vivipary is adelphophagy or intrauterine cannibalism , in which the largest embryos eat weaker, smaller unborn siblings.
Hemiramphus is a genus of schooling marine fish commonly called halfbeaks, garfish, or ballyhoos, and are members of the family Hemiramphidae.They inhabit the surface of warm temperate and tropical sea, and feed on algae, plankton, and smaller fish.
The body shows typical halfbeak shape with an elongated lower jaw and cylindrical elongated body. [1] They have no spines on fins, but do have 12-15 rays of their dorsal fins and 10-13 rays on their anal fins. [1] The longest recorded Jumping halfbeak was 34 cm long. There are no vertical bars on sides of the body as other halfbeaks. [1]
The common halfbeak grows to a length of about 30 cm (12 in). It is an elongated cylindrical fish, tapering slightly at both ends; the length is typically six to ten times the depth. As is typical of halfbeaks, the lower jaw is elongated (less so in young fish) while the upper jaw is short.