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Many different types of animals come together to form vast groups – insect swarms, mammal herds, or bird flocks, for example. Researchers in France added another example to the list, reported Oct. 5 in the online journal PLoS ONE: the huge Wels catfish, the world's third largest and Europe's largest fresh-water fish.

Peer into any stream in a South American rainforest and you may well see a small shoal of similar-looking miniature catfish.

Copper sulfate has emerged as an effective treatment for Ichthyophthirius multifiliis, also known as "Ich," a protozoan parasite that appears as white spots on infected fish.