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Depending on the species, determining the sex of a fish ranges from easy to nearly impossible. Knowing the sexual differences in aquarium fish is important when trying to breed fish and also for choosing the proper balance of fish for a community aquarium. Although not all fish can be easily identified by sex, these tips will help you recognize the sex of many of the common species of aquarium fish.

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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.

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We may take it for granted that the sex of an animal is established at birth and doesn't change. However, about species of fish change sex in adulthood, often in response to environmental cues. How these fish change sex has, until now, been a mystery.

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Please refresh the page and retry. M ating is never easy when you have an unsightly bulbous appendage protruding from your head. The female wrasse is endowed with the extraordinary ability to unexpectedly switch gender, a change which not only scuppers any burgeoning relationship with the male but also creates another headache for him - a new love rival.

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We may take it for granted that the sex of an animal is established at birth and doesn't change. However, about species of fish change sex in adulthood, often in response to environmental cues. How these fish change sex has, until now, been a mystery.

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By Michael Le Page. For many fish, changing sex is a normal part of life. For the first time, we have found out exactly how one of these species — a small cleaner fish called the bluehead wrasse — does it.

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WHEN a school of reef fish loses its single male, the largest female begins acting like a male within a few hours and will produce sperm within 10 days. Some other species repeatedly switch back and forth between the production of eggs and of sperm during a single mating. Among deep sea fish that only rarely encounter potential mates, reproduction is often possible only if one changes sex.

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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. Most male fish have two testes of similar size.

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Marc Silver. A fisherman's boat makes its way across Lake Chilwa in Malawi. A large portion of Lake Chilwa dries out every year, and the fishing industry disappears along with it.

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