Agence France-Presse: One of the biggest victims of the huge oil spill slamming Louisiana’s economy is the region’s largest fishery, which has seen its catch drop 50 percent at a critical time in the season. Three weeks into the six-month fishing season, the Gulf of Mexico oil slick has made a "just dreadful" impact on the industry, said Daybrook Fisheries president Gregory Holt. He described his business as the region’s "economic generator" as far as fisheries are concerned. "My heart goes out to …