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" ... Zebrafish (Danio rerio) are freshwater fish from the minnow family. Schuman’s team raised some zebrafish alone in tanks and some zebrafish with others. Consistently, the researchers found that the level of the hormone called parathyroid hormone 2 (pth2) changed in fish as the number of fish present in its tank changed. When a fish was alone, no pth2 was apparent. If other fish were added to the tank, the first fish’s pth2 level rose. If a lot of fish were added, the pth2 level rose a lot. Pth2 levels could significantly rise in as few as thirty minutes ... "