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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.
The fish family Syngnathidae has the unique characteristic of a highly derived form of male brood care referred to as "male pregnancy". [2] The family is highly diverse, containing around 300 different species of fish.
Generally, males reach 1.5 in (3.8 cm) and females 2.5 in (6.4 cm). These fish are a livebearer species, and as such, the females are larger and more rounded than the males. Pregnant females are also easily recognizable by their gravid spot; a darker area on their bellies where they hold the fry.
Pregnant male pipefish can absorb nutrients from their broods, in a manner very similar to filial cannibalism found in many other families of fish. The smallest eggs in a brood of various egg sizes usually have lower survival rates than larger ones due to the larger eggs having a longer-lasting food source (absent contributions from the father ...
When including fish as your main source of protein, be sure to favor types that are low in mercury, such as canned light tuna, salmon and catfish. This is particularly true for children, pregnant ...
Commercial fisheries exist for the largest species, making them important food fish. However, the U.S. Food and Drug Administration warns pregnant or breastfeeding women against eating tilefish and some other fish due to mercury [broken anchor] contamination. [6] [7] Exceptionally colorful smaller species of tilefish are favored for aquariums.
Pregnant women who eat more than three servings of fish a week may face an increased risk of having babies who grow rapidly and become obese in childhood. Eating lots of fish in pregnancy linked ...