UC Davis researchers have discovered two key signals that tell fish how to handle the stress of changing concentrations of salt as they swim through different waters.
Not many fish can travel between saltwater and freshwater. To maintain the right internal salt level, their gills must pump up salt from freshwater but excrete it in the ocean. "Fish that can survive both environments are able to resist many kinds of stress," said Dietmar Kueltz, an assistant professor of animal science.
Kueltzs team wants to understand the chain of signals that control the stress response in these fish. They experimented with tilapia, moving the fish directly from a freshwater tank to one holding seawater. They observed a rapid increase in the levels of two transcription factors: proteins that flip specific genes on and off in the tilapias gills.
Pat Bailey | EurekAlert!
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