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The males do not have to compete with other males, and female anemone fish are typically larger. When a female dies a juvenile (male) anemone fish moves in, and "the resident male then turns into a female and reproductive advantages of the large female–small male combination continue". [22] In other fishes sex changes are reversible.
Brightly coloured fish with large fins, such as male guppies, should be avoided, as they may invite fin nipping by the male betta. Potential tankmates should usually be added before the male betta so they can establish their respective territories beforehand, rather than compete with the betta.
The best known Betta species is B. splendens, commonly known as the Siamese fighting fish and often kept as an aquarium pet. Characteristics All Betta species are small fishes, but they vary considerably in size, ranging from under 2.5 cm (1 in) total length in B. chanoides to 14 cm (5.5 in) in the Akar betta ( B. akarensis ).
Betta compuncta reproduces sexually and is a paternal mouthbrooder, with males of the species incubating eggs for about 12 to 18 days, although incubation time can vary with water temperature. [4] Male individuals of Betta compuncta tend to have broader heads than females. The ovaries of female individuals can be seen under a spotlight. [5]
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.
A stingray that got pregnant at a North Carolina aquarium this winter despite not having shared a tank with a male of her species for many years has died. The Aquarium and Shark Lab in ...
A North Carolina aquarium that said it had a pregnant stingray with no male companion now says the fish has a rare reproductive disease. Thursday's statement from the Aquarium and Shark Lab in ...
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