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Luiz gets to do some amazing work documenting fish biodiversity around the world. If you can think of anything involving sex, from group sex to monogamy for life to males with penises on their heads , you can probably find good examples in fishes. Here I want to focus on a particularly interesting and bizarre aspect of fish sexual life: sex changing! Hermaphroditism the expression of both female and male reproductive organs in the same individual in fishes can occur in many ways, but most commonly, a fish starts off as one sex, and changes to the other at a certain stage in life sequential hermaphroditism.
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One fish, new fish, girl fish, blue fish: sex change at the aquarium

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Sex change - Wikipedia

Sex roles are typically thought of as being fixed for a given species. In most animals males compete for females, whereas the females are more reluctant to mate. Therefore sexual selection usually acts most strongly on males. This is explained by males having a higher potential reproductive rate than females, leading to more males being sexually active a male-biased operational sex ratio. However, what determines sex roles and the strength of sexual selection is a controversial and much debated question. In this large-scale field study, we show a striking temporal plasticity in the mating competition of a fish two-spotted goby, Gobiusculus flavescens.
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Fish are the sex-switching masters of the animal kingdom

Millions of people saw a dramatic example of this in the first episode of Blue Planet II, in which a ten-year-old female kobudai also known as an Asian sheepshead wrasse, Semicossyphus reticulatus changes into a male. After many months, the transformed male emerges from its lair larger than before, bearing testes, a huge bulbous forehead, and an aggressive nature. Now even larger than the existing dominant male it had previously mated with when female, the new male defeats the aged alpha in a violent battle for dominance. The footage is remarkable — but the transformation is actually not terribly unusual. Some like the kobudai change routinely from female to male.
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Fish reproductive organs include testes and ovaries. In most species, gonads are paired organs of similar size, which can be partially or totally fused. The genital papilla is a small, fleshy tube behind the anus in some fishes, from which the sperm or eggs are released; the sex of a fish often can be determined by the shape of its papilla.
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