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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.
How long do betta fish live? In captivity, betta fish typically live two to five years, according to Adelphi University. Some betta fish, however, have lived longer.
Consider one red drum that is 400 millimeters long and has a weight of 616 grams. Based on the reference weight-length relationship, a red drum that is 400 mm long is expected to have a weight of 655 grams. The condition index for that fish is its actual weight divided by its expected weight times one hundred percent, or (616g/655g)x100% = 94%.
Yes, pet fish are low-maintenance pets. Compared to dogs and cats, a freshwater fish is a walk in the park (not literally, they don’t like that). However, fish are...
The Amazon molly (Poecilia formosa) is a freshwater fish native to the warm waters of northeastern Mexico and the southern parts of the U.S. state of Texas. [1] [3] It reproduces through gynogenesis, and essentially all individuals are females.
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Labor-time calculation is a method of economic calculation that uses labor time as the basic unit of accounting and valuation. This method of calculation was advocated by the economists Otto Bauer , Helene Bauer and Otto Leichter [ de ] as an alternative to calculation in kind for a socialist economy. [ 1 ]