Cross-section of the earstone, or otolith, from a totoaba shows the annual rings that researchers use to learn about the fishs history.
Adult totoaba otolith collected from an Indian midden. Specimen courtesy of Scripps Institute of Oceanography, La Jolla, Calif.
During their tender youth, both the endangered fish species totoaba and the commercially important gulf corvina require the brackish water habitat provided by the shrinking Colorado River estuary, report researchers.
Although overfishing has been implicated in the decline of both species, commercial harvesting isn’t the only reason for the two species’ decline, the finding suggests. Since 1960, diversion of Colorado River water for human uses has greatly reduced the amount of fresh water that reaches the Gulf of California, thereby reducing the brackish-water estuary, the region where river water and ocean water mix.
"It’s the first time that we’ve been able to substantiate that these fish are using Colorado River water," said Kirsten Rowell, the aquatic biologist who led the research team. "We provide evidence that both of these fish need brackish water in their youth, but today the northernmost part of the Gulf of California is more saline than the open ocean."
Mari N. Jensen | University of Arizona
Helping to Transport Proteins Inside the Cell
21.11.2018 | Albert-Ludwigs-Universität Freiburg im Breisgau
UNH researchers create a more effective hydrogel for healing wounds
21.11.2018 | University of New Hampshire
Innsbruck quantum physicists have constructed a diode for magnetic fields and then tested it in the laboratory. The device, developed by the research groups led by the theorist Oriol Romero-Isart and the experimental physicist Gerhard Kirchmair, could open up a number of new applications.
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Max Planck researchers revel the nano-structure of molecular trains and the reason for smooth transport in cellular antennas.
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Researchers at the University of New Hampshire have captured a difficult-to-view singular event involving "magnetic reconnection"--the process by which sparse particles and energy around Earth collide producing a quick but mighty explosion--in the Earth's magnetotail, the magnetic environment that trails behind the planet.
Magnetic reconnection has remained a bit of a mystery to scientists. They know it exists and have documented the effects that the energy explosions can...
Biochips have been developed at TU Wien (Vienna), on which tissue can be produced and examined. This allows supplying the tissue with different substances in a very controlled way.
Cultivating human cells in the Petri dish is not a big challenge today. Producing artificial tissue, however, permeated by fine blood vessels, is a much more...
Faster and secure data communication: This is the goal of a new joint project involving physicists from the University of Würzburg. The German Federal Ministry of Education and Research funds the project with 14.8 million euro.
In our digital world data security and secure communication are becoming more and more important. Quantum communication is a promising approach to achieve...
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