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Water lettuce taking over lake Chapala. http://aquaplant.tamu.edu/plant-identification/alphabetical-index/water-lettuce/ http://aquaplant.tamu.edu/management-options/water-lettuce/ Water lettuce is a very aggressive invader and can form thick floating mats. If these mats cover the entire surface of the lake they can cause oxygen depletions and fish kills. Water lettuce should be controlled so they do not cover the entire lake. Much like water hyacinth, water lettuce starts out slow -- particularly during cool spring days. Warm sun makes it grow like gangbusters. some photos i took on the lake today https://plus.google.com/photos/114872934905750854007/albums/6232649837523535361?gpinv=AMIXal84Vk5t01lpF6QKHv_2LEtrLckwyP3dDSzVzmgagOllfFUBP38FHd0cJJ6aWWDAhJIOaYhD3HoKrQxGpqpQgsllCTz10XSlv_kF_SjKXo1S2gYAw-s&authkey=CNqEkcKs9PiLggE&cfem=1