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Tag: fish

Fish evolved near shorelines, not in deep waters, study says

Fish evolved near shorelines, not in deep waters, study says

Science
Oct. 26 (UPI) -- Fish likely evolved from shallow shorelines, dating back more than 400 years ago, according to scientists. New findings were published in Science magazine Friday on the evolution of vertebrae fish during the middle Paleozoic era, from 480 million to 360 million years ago. The study was conducted by a team of researchers from the University of Pennsylvania, University of Michigan, University of Manchester and University of Birmingham. The team focused primarily on fossil vertebrates, both jawed and jawless fish. Scientists found that larger fish diversified near shorelines, and later thinner fish populated deeper marine and freshwater habitats. Their goal was to "complete a missing link in our evolutionary story" by closing some of the gaps of what researchers knew about ...
Jurassic-era piranha is world's earliest flesh-eating fish

Jurassic-era piranha is world's earliest flesh-eating fish

Science
Scientists have unearthed the fossilised remains of a piranha-like species that they say is the earliest known example of a flesh-eating fish.This bony creature, found in South Germany, lived about 150 million years ago and had the distinctive sharp teeth of modern-day piranhas. These Jurassic marauders used their razor teeth to tear chunks of flesh and fins off other fish.Other fish were found nearby which had been attacked by the ancient piranhas."We have other fish from the same locality with chunks missing from their fins," said Dr David Bellwood of James Cook University, Australia, who is one of the authors of the study."Feed on a fish and it is dead; nibble its fins and you have food for the future." ...
New small, neon fish species discovered

New small, neon fish species discovered

Science
Sept. 25 (UPI) -- Scientists aren't sure how a fish this brightly colored went undiscovered for so long. But it did. Tosanoides aphrodite, a new coral fish species, was described for the first time this week in the journal ZooKeys. Scientists discovered the neon species among the reefs of St. Paul's Rocks, an archipelago off the coast of Brazil. Perhaps it is the species' remote home in the middle of the equatorial Atlantic that made the fish so elusive. But once scientists spotted the bright pink, yellow and green fish, they couldn't look away. "This is one of the most beautiful fishes I've ever seen," Luiz Rocha, curator of fishes at the California Academy of Sciences, said in a news release. "It was so enchanting it made us ignore everything around it." Genetic analysis confirmed the ...
Light pollution inspires boldness in fish

Light pollution inspires boldness in fish

Science
Sept. 21 (UPI) -- Researchers in Germany found fish exposed to artificial light during the night were bolder during the day. In the lab, light pollution caused the test fish, guppies, to be more active at night. The artificial light also cause fish to emerge from their hiding places more quickly during the daytime. The fish didn't become slower or lazier as a result of the increase in nighttime activity. Researchers found the guppies' swimming speed and social behavior was unaltered by light pollution. A number of studies have documented the impacts of light pollution on animals and their ecosystems. The allure of a big city's bright lights can alter a bird's migration pattern. Light pollution can also interfere with coral's ability to spawn. For the experiment, scientists exposed three ...
Study reveals how zebra fish get their stripes

Study reveals how zebra fish get their stripes

Science
Aug. 13 (UPI) -- Every zebra fish begins life as a transparent embryo. Almost all of them end up with stripes. Now, researchers know why. Scientists at Ohio State University developed a mathematical model that describes the organization of the zebra fish's three types of pigment cells. "It's amazing that you have these individual cells that can sort themselves into these reliable patterns," Alexandria Volkening, a postdoctoral fellow at Ohio State's Mathematical Biosciences Institute, said in a news release. "The cells move around on the skin to create stripes. It's like individual birds that know how to flock together and fly in formation." The research, published this week in the journal Nature Communications, suggests the pigment cell sorting process is orchestrated by iridophores. Th...