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.
Sex for fish sometimes referred to as "fish for sex" is a phenomenon in which female traders engage in sexual relationships with fishermen to secure their supply of fish. Along the beaches where the sex for fish practices have been observed, the fishermen do maintain several transactional sexual relationships with women at different beaches where they land with their fish. Sex for fish as a phenomenon is common in many low and middle income developing countries; however, the bulk cases have been observed in Sub-Saharan Africa's inland fisheries. The most vulnerable victims are economically disadvantaged women, e. Several social-economic factors including poverty, cultural practices, and competition among women who are involved in fish trade are often listed as variables fueling the sex for fish practice.
Women and fish-for-sex: transactional sex, HIV/AIDS and gender in African fisheries
We wanted to tell a story of seasonal change in One Ocean and to show how small changes in temperature can have a big influence on marine life in the seasonal seas. Our team then began to investigate and discovered that a rise in sea temperature triggers the males to engage in territorial battles over the right to spawn, and more interestingly, that all the big males that fight were once females. Having studied marine biology it was no surprise to me that kobudai change their sex.
One would expect that after sex, these women would receive the fish for free. But shockingly, the women still have to pay cash for the fish. Sometimes, for leverage, women are forced to make available their younger female relatives, many of whom are below the age This provides them with the competitive edge that they require in order to cushion themselves from the difficulties caused by scarcity of commodities. Approximately women in Nyanza trade fish either directly or indirectly.