(July 19, 2011) China’s weekly newspaper, the Economic Observer, says the Three Gorges dam is the primary reason for the demise of the Yangtze’s “big four” fish species. By changing the hydrological regime downstream of the dam, the fry population of the black, grass, silver, and bighead carp have plummeted by 97%. Attempts to simulate the original hydrological conditions with forced water releases and restocking the river with broodstock will be futile say experts.