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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.
Common names of fish can refer to a single species; to an entire group of species, such as a genus or family; or to multiple unrelated species or groups.Ambiguous common names are accompanied by their possible meanings.
The majority of Goodeid fish are viviparous, typically giving birth to live young. The family includes a number of popular aquarium fish, for example the redtail splitfin Xenotoca eiseni . Recent phylogenetic studies have put the age of this family at approximately 16.5 million years, with the majority of divergence occurring in the Miocene period.
Adaptive hypotheses, including the locomotor hypothesis, [7] Trexler-DeAngelis Model [8] (reproductive allotment), and life-history facilitation, [9] [6] broadly suggest that the placenta evolved to facilitate the evolution of another advantageous trait in the fish's environment. The conflict hypothesis suggests the placenta is a nonadaptive ...
List of fish common names; List of longest fish; M. List of fresh water fishes of Maharashtra; List of marine aquarium fish species; N. List of fish named after animals;
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A mammal embryo (centre) is attached by its umbilical cord to a placenta (top), through which the mother provides food to the embryo while it is in her uterus.. Matrotrophy is a form of maternal care during organism development, associated with live birth (), in which the embryo of an animal or flowering plant is supplied with additional nutrition from the mother (e.g. through a placenta).
List of fish of the Black Sea This page was last edited on 8 November 2024, at 00:03 (UTC). Text is available under the Creative Commons Attribution-ShareAlike ...