Kelsey James/NOAA Fisheries Gary Longo was looking for what he thought would be small genetic differences across a single species of small, ocean-dwelling fish: Pacific sardine. But as he examined ...

Grunion are small, Southern California fish most famous for one thing: having sex on the beach. Every March to September, they can be spotted leaving the ocean in droves to spawn on the beach late ...

Thousands of species throughout the ocean and terrestrial ecosystems rely on fish for food – including people. In coral reef ecosystems, small fish are eaten by larger fish and other marine animals.