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Tag: fish

Amazon fish challenges mutation idea

Amazon fish challenges mutation idea

Science
Evolutionary theory suggests that species favouring asexual reproduction will rapidly become extinct, as their genomes accumulate deadly mutations over time.But a study on an Amazon fish has cast doubt on the rapidity of this decline. Despite thousands of years of asexual reproduction, the genomes of the Amazon molly fish are remarkably stable and the species has survived. Details of the work have been published in Nature Ecology and Evolution.There are two fundamental ways in which new generations of life come to being - sexual and asexual reproduction.Sexual reproduction relies on special reproductive male and female sex cells, the eggs and sperm, joining together during the process of fertilisation.Each sex cell contains half the number of chromosomes of normal parent cells, then follow...
Study links fish consumption with higher IQ, better sleep

Study links fish consumption with higher IQ, better sleep

Health
Dec. 21 (UPI) -- Kids who eat fish at least once a week score higher on IQ tests and experience better sleep, according to new research by scientists at the University of Pennsylvania.Omega-3s, fatty acids found in fish, have previously been linked individually to boosts in intelligence and improved sleep. But the latest study -- published this week in the journal Scientific Reports -- is one of the first to examine the relationship between all three variables."This area of research is not well-developed. It's emerging," Jianghong Liu, an associate professor of nursing and public health at Penn, said in a news release. "Here we look at omega-3s coming from our food instead of from supplements."The study included 541 children in China, ages nine to 11, 54 percent boys and 46 percent girls. ...
Are plastic nanoparticles causing brain damage in fish?

Are plastic nanoparticles causing brain damage in fish?

Science
Sept. 25 (UPI) -- Fish may be suffering brain damage as a result of plastic pollution. New research shows plastic nanoparticles can end up inside the brains of fish."Our study is the first to show that nanosized plastic particles can accumulate in fish brains," Tommy Cedervall, a chemistry researcher at Lund University in Sweden, said in a news release.Cedervall and his colleagues tracked the path of tiny plastic particles through marine food chains. The nanoparticles can be consumed by plankton, and the plastic-stuffed plankton can be eaten by fish. If the plastic particles are small enough, they can sidestep the blood-brain barrier and accumulate inside a fish's brain.In tests, researchers found fish with plastic particles inside their brain tend to eat slower and spend less time explori...
Fish sauced? Goldfish turn to alcohol to survive icy winters

Fish sauced? Goldfish turn to alcohol to survive icy winters

Science
Scientists have decoded the secrets behind a goldfish's ability to survive in ice-covered lakes. They've worked out how and why the fish turn lactic acid in their bodies into alcohol, as a means of staying alive.Some goldfish were found to have levels well above legal drink-driving limits in many countries.The researchers say the work may help with the study of some alcohol impacts in humans.Scientists have known about the peculiar survival abilities of goldfish and their wild relatives, crucian carp, since the 1980s. While humans and most vertebrates die in a few minutes without oxygen, these fish are able to survive for months in icy conditions in ponds and lakes in northern Europe. Researchers have now uncovered the molecular mechanism behind this ability. In most animals there is a sin...
Subsea pipelines offer shelter to important commercial fish species in Australia

Subsea pipelines offer shelter to important commercial fish species in Australia

Science
June 12 (UPI) -- For conservationists and environmentalists, pipelines and the oil they carry are mostly viewed as a threat to ecological health. But new research suggests they serve as a safe haven for important commercial fish species off the coast of northwest Australia.The North West Shelf, which lies off the coast of Western Australia, features an array of gas wells, subsea pipelines and other kinds of underwater infrastructure necessary to support oil and gas exploration in the region.Oil and gas companies regularly use remote operated vehicles, or ROVs, to monitor their pipelines. Researchers at the University of Western Australia used video footage from industry submersibles to survey fish diversity and abundance around pipelines at varying depths.Their analysis revealed a surprisi...