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The males can change sex to female during their lives, and live in a harem in which an established dominance hierarchy manages the group and keeps individuals at a specific social rank. All anemonefish are protandrous hermaphrodites, meaning they first develop into males and may become females later in life.
This shift is a result of social and environmental factors. When there isn't a male in the group, activation takes place. Cetoscarus bicolor is sexually mature at around three years of age, and the size distribution for a given population tends to show that the largest fish are male due to this lot of alternative gonochorism (Choat & Robertson ...
Social organization plays a large role in the changing of sex by the fish. It is often seen that a fish will change its sex when there is a lack of a dominant male within the social hierarchy. The females that change sex are often those who attain and preserve an initial size advantage early in life.
Sequential hermaphroditism (called dichogamy in botany) is one of the two types of hermaphroditism, the other type being simultaneous hermaphroditism. It occurs when the organism's sex changes at some point in its life. [1] A sequential hermaphrodite produces eggs (female gametes) and sperm (male gametes) at different stages in life. [2]
The stoplight parrotfish is a protogynous hermaphrodite that shows full sexual dichromatism, meaning that it changes its sex from female to male during its lifespan, and its color changes with its sex change. [4] The sex change is most likely due to the control of hormones, in particular, 11-ketetestosterone (11-KT). [5]
Protogynous sex change is the female to male gonadal redifferentiation, and it is often found within species that practice haremic polygyny, or one male reproducing with many females. When socially dominant males disappear, larger initial phase female fish will undergo sex change to become terminal phase males.
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The common name of "Amazon molly," acknowledges this trait as a reference to the Amazon warriors, a female-run society in Greek mythology. [4] The Amazon molly is a hybrid species, and its parent species are the sailfin molly ( Poecilia latipinna ) and the Atlantic molly ( Poecilia mexicana ). [ 5 ]