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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.
The larval period in oviparous fish is relatively short (usually only several weeks), and larvae rapidly grow and change appearance and structure (a process termed metamorphosis) to become juveniles. During this transition larvae must switch from their yolk sac to feeding on zooplankton prey, a process which depends on typically inadequate ...
Ovoviviparous fish embryos mostly get their nutrients from the yolk of their eggs while viviparous fish embryos mostly get their nutrients directly from their mother. [17] The gestation period is usually the only maternal care provided in these fish as they are developed when they are born. [17]
Large mammals develop at an absolute slower rate compared to small mammals. Thus, the large mammal tend have longer gestation periods than small mammal as they tend to produce larger neonate. [32] Large mammals require a longer period of time to attain any proportion of adult mass compared to small mammals. [33]
The female deposits her eggs into the male's brood pouch. Through the pregnancy the pair strengthens their pair bonds with daily greetings. [7] The gestation period for H. barbouri is 12–14 days, with a typical brood size of about 10–240 offspring. They give no parental care to juveniles after birth.
Pregnant women have been warned off fish because of concerns about mercury levels, but new research suggests that eating certain kinds of fish in the later stages of pregnancy can be helpful in ...
A litter of tiny baby animals is calling a South Carolina zoo its new home, photos show. John, a “fantastic” mother otter, gave birth to a litter of pups Jan. 20, according to a Feb. 7 ...
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