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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 male fish have two testes of similar size. In the case of sharks, the testes on the right side is usually larger [citation needed].The primitive jawless fish have only a single testis, located in the midline of the body, although even this forms from the fusion of paired structures in the embryo.
These fish have both ovaries and testes and can produce both eggs and sperm at the same time. Others are sequential hermaphrodites. Others are sequential hermaphrodites. These fishes start life as one sex and undergo a genetically programmed sex change at some point during development.
Pregnant male seahorse. Male pregnancy is the incubation of one or more embryos or fetuses by organisms of the male sex in some species. Most species that reproduce by sexual reproduction are heterogamous—females producing larger gametes and males producing smaller gametes ().
Generally speaking, most fish do well in tank water temperatures of 75°-80°F. But this may vary depending on the type of fish you keep. So check (and double-check) the best temperature for your ...
Parthenogenesis can occur without meiosis through mitotic oogenesis. This is called apomictic parthenogenesis. Mature egg cells are produced by mitotic divisions, and these cells directly develop into embryos. In flowering plants, cells of the gametophyte can undergo this process. The offspring produced by apomictic parthenogenesis are full ...
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Most couples don’t get pregnant when they first try to conceive and that is normal, experts explain. Nearly 60% of women say they wish they knew how long it would take to get pregnant before ...