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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. For ...
There is evidence that the genetic basis for aggression in betta fish is not exclusively sex-linked – a 2019 study found that female bettas of the fighting strain show significantly higher levels of aggression than their female wild-type counterparts, despite the fact that historically only male bettas have been used in fights and thus ...
Betta balunga is a species of gourami endemic to the island of Borneo, and whose species name derives from the location where it was first described - the Balung River in Sabah, eastern Malaysia. [3] It inhabits forest and blackwater streams, and grows to a length of 4.9 cm (1.9 in).
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 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 ...
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 female stingray who gained national attention after she became pregnant despite not having a male companion has developed a rare reproductive disease, according to the aquarium where she resides.
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 ...