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Category. : Ovoviviparous fish. Ovoviviparous fish give birth to live young. Unlike viviparous species, their embryos are nourished by an egg yolk, and not directly by the parent. See also: Category:Viviparous fish - fish which give birth to live young which receive nourishment whilst in the womb.
The condition index in fish is a way to measure the overall health of a fish by comparing its weight with the typical weight of other fish of the same kind and of the same length. The condition index is its actual weight divided by its expected weight, times 100%. A fish of normal weight has a condition index of 100 percent.
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 .
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Infraclass Holostei (gars and bowfins) Infraclass Teleostei (many orders of common fish) Class Sarcopterygii (lobe-finned fish) Subclass Actinistia (coelacanths) Subclass Dipnoi (lungfish, sister group to the tetrapods) † – indicates extinct taxon. Some palaeontologists contend that because Conodonta are chordates, they are primitive fish.
The Syngnathidae is a family of fish which includes seahorses, pipefishes, and seadragons (Phycodurus and Phyllopteryx). The name is derived from Ancient Greek: σύν (syn), meaning "together", and γνάθος (gnathos), meaning "jaw". [1] The fused jaw is one of the traits that the entire family have in common. [2]
Argyrosomus regius is a demersal, oceanodromous fish which is found in inshore waters and on the continental shelf, it can occur close to the bottom as well as in surface and mid-waters. The adults prey on grey mullet and clupeids such as sardines [6] which are actively pursued in open water. The adults gather in inshore waters to spawn during ...
Fish stocks. Fish stocks are subpopulations of a particular species of fish, for which intrinsic parameters (growth, recruitment, mortality and fishing mortality) are traditionally regarded as the significant factors determining the stock's population dynamics, while extrinsic factors (immigration and emigration) are traditionally ignored.
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