Australia's tropical fish are heading south into cooler waters. These fish are not just visiting. They are settling into the milder "temperate" reefs that used to be too cold for them. As they do, ...

Just a few nights under the glow of coastal lights is enough to send reef fish into a spiral of sleeplessness and aggression, and the damage reaches far deeper than their behavior.

When you think about climate change in our oceans, you may picture coral bleaching, melting sea ice, or extreme weather events. But beneath the ocean’s surface, another quiet shift is underway.