Dead fish float on the surface of a stream near the Nanjundapuram check dam in Coimbatore.

Civic workers remove dead fish floating at a partially dried up lake in Ambattur, Chennai. Many water bodies in the city are running dry in hot weather.

Dead fish float in the Rodrigo de Freitas lagoon in Rio de Janeiro. About 21 tons of fish died in the Rio de Janeiro lagoon, while city authorities and biologists argue about the c...

Dead carp float in the Euphrates River, near the town of Hindiyah, 80 kilometers (50 miles) south of Baghdad, Iraq. Officials and fishermen are at a loss to explain how hundreds of...

Bernard Breton, on vacation from Canada, fishes near Tulip Ave., surrounded by dead fish on Cocoa Beach, Florida. Red tide has been slowly moving up the east coast in recent weeks,...