JeanPierre Szpala from the boat tour agency 'Emeraude Navigation' collects Egeria densa a largeflowered waterweed in the Canal de Garonne on August 3...
{"Image ImageDescription": "Jean-Pierre Szpala, from the boat tour agency \"Emeraude Navigation\" collects Egeria densa, a large-flowered waterweed, in the Canal de Garonne, on August 3, 2017 in Fourques-sur-Garonne.\nThe waterweed reduces flow and water level when it forms thick layers underwater, leaving a narrow channel. It's worrying and threatening to the navigation, which concerns 2,000 to 2,500 boats per year on the canal, according to the Navigable Waterways of France (VNF). / AFP PHOTO / MEHDI FEDOUACH        (Photo credit should read MEHDI FEDOUACH/AFP via Getty Images)"}