Fuzzy numbers etc.

An article Wednesday about the possibility that commercial fishing may be endangering the vaquita porpoise, which lives in the Gulf of California near the mouth of the Colorado River, rendered incorrectly part of a quotation from Karl W. Flessa, a geologist at the University of Arizona, who said the damming and diversion of the river may also be responsible for the porpoise's decline. He said the reduction in the river flow was 15 million acre-feet of water a year not a day.