In the Chavez presidency, the Lake Maracaibo protection was neglected, leading to serious pillage and contamination episodes by Hidrolago, Petrol companies, etc... The old ecosystem, plenty of fishes was destroyed and displaced by another ecosystem, one that is very ill. You can't use this water anymore to provide food for the people. Most fishes are gone and duckweeds poison the water regularly.

You can easily create fertilizer processing organic residues, after all is a "subproduct of humans", but the government decided instead to simply trow all to the lake without any processing, that is a criminal movement.