Study: Brain evolution is linked to competition

In response to a high-competition environment, Trinidadian killifish evolve larger brains, increasing their fitness and survival rates, according to a new study in Ecology Letters by biologists at The University of Texas ...

Fish exposed to estrogen produce fewer males

Water tainted with even a small concentration of human hormones can have profound effects on fish, according to a University of Cincinnati biologist.

Neutral evolution shapes lifespan and aging

Different African killifish species vary extensively in their lifespans—from just a few months to several years. Scientists from the Max Planck Institute for Biology of Ageing in Cologne investigated how different lifespans ...

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