Zhang Cuiqin and her husband in Fengrun district, Tangshan in North China's Hebei Province check the dead fish in their fish pond. All the fish in the pond, amounting to over 30,000 kilograms, have been dead since Sunday evening, resulting in a loss of at least 200,000 yuan ($31,413). The couple suspect they were intentionally poisoned. Local police have started an investigation. Photo: CFP