Recommended for you In sync: The presence of feminized fish in protected areas such as refuges suggests that pollution may be more pervasive than previously thought. Monday, September 4, Thursday, August 31, Pollution in the environment can take many forms, from physical trash to invisible chemicals. Serendipitous discovery may lead to eco-friendly lubricant August 27, Seed oil components of an ornamental flower could provide a direct pathway for designing a new class of environmentally friendly lubricants. What are some realistic options to counteract excessive estrogenic substances in our water that are affecting fish? The main chemical responsible for feminizing fish is ethinyl estradiol, a synthetic hormone found in birth control pills that women excrete. Studies such as this one highlight how feasible actions to stem the flow of estrogens can make a big difference to an ecosystem. Study links water pollution with declining male fertility January 19, New research strengthens the link between water pollution and rising male fertility problems.
Additionally, fertilization success, measured by the number of fertilized eggs capable of leading to live offspring, also declined with increasing severity of the intersex condition in the roach Jobling et al. Wastewater treatment upgrades result in major reduction of intersex fish January 10, Upgrades to a wastewater treatment plant along Ontario's Grand River led to a 70 per cent drop in fish that have both male and female characteristics within one year and a full recovery of the fish population within three Naturally possessing both sex organs makes these hermaphroditic species unique. Even protected, supposedly pristine areas are not free of the intersex phenomenon. The improved treatment process increased the removal of ammonia, leading to a final effluent with a much lower estrogen concentration. One potential approach is making upgrades to wastewater treatment facilities, and a facility in Canada that made small upgrades demonstrated promising results Hicks et al. This post featured in our weekly e-newsletter, the Fish Report. How cells make connections could impact circadian rhythm August 27, If you've ever experienced jet lag, you are familiar with your circadian rhythm, which manages nearly all aspects of metabolism, from sleep-wake cycles to body temperature to digestion. S Fish and Wildlife Service studied 19 national wildlife refuges in the northeastern United States and found that 60— percent of the examined male smallmouth bass species shown in the photo above displayed intersex characteristics Iwanowicz et al. Scientists 'fix' bacterial tree of life August 27, Bacterial classification has been given a complete makeover by a team of University of Queensland researchers, using an evolutionary tree based on genome sequences. This is a global problem, with feminized male fish discovered in at least 37 species of fish in lakes and rivers around the world Bahamonde et al. Studies such as this one highlight how feasible actions to stem the flow of estrogens can make a big difference to an ecosystem. For example, a study on the common roach Rutilus rutilis showed that intersex fish produced less milt, their milt had a lower sperm density, and the sperm had reduced motility compared to normal males. Serendipitous discovery may lead to eco-friendly lubricant August 27, Seed oil components of an ornamental flower could provide a direct pathway for designing a new class of environmentally friendly lubricants. In recent years, attention has been focused on substances discharged into the environment that can disrupt the normal endocrine hormone function of fish and wildlife. Research methods that find serial criminals could help save tigers August 27, A geographic profiling tool used to catch serial criminals could help reduce the casualties of human-tiger conflict, according to scientists who collaborated on an innovative conservation research study. Fishing activity skyrocketed ahead of ban in South Pacific area August 27, Ahead of a full ban, fishing increased percent in the Phoenix Islands Protected Area in the South Pacific, setting back projected efforts to let nature rebuild fish stocks by 18 months, researchers say. Fish found to communicate with one another using urine February 2, Phys. The main chemical responsible for feminizing fish is ethinyl estradiol, a synthetic hormone found in birth control pills that women excrete. You can subscribe to the Fish Report here. However, when female eggs are present in male fish that are not hermaphroditic, as in the case of intersex individuals, it can greatly impede reproductive success. Once it enters a waterway, chemical pollution can spread over great distances and pose harm to aquatic species. Ethinyl estradiol is not only potent, but also extremely difficult to remove from wastewater, leading to the chemical slipping through treatment plants and ending up in natural waterways. What are some realistic options to counteract excessive estrogenic substances in our water that are affecting fish? Solving a molecular mystery August 27, What do cancer and the growing legs of a fruit fly have in common? How do fruit flies grow legs?
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