The sturgeon of Qinghai Lake is a rare fish, but since the 1950s, people have started to catch sturgeon in large quantities, resulting in the amount of sturgeon resources decreasing from the initial 320,000 tons at an average annual rate of 4 million tons to 2013 In the year, catfish resources were only 68,000 tons, and an expert believes that at this rate, catfish in Qinghai Lake will become extinct in a dozen years. Which of the following, if true, can best refute the expert's point of view? ['The Red List of Chinese Species has listed catfish as an endangered species, and has adopted a number of measures for effective protection.', 'Although one-time poaching of more than 50 kg of catfish would constitute a crime, the number of poachers is still increasing.', 'A catfish of about two pounds can sell for hundreds of yuan, which makes many fishermen aim their catfish at catfish.', 'In the past year, the reduction of catfish in Qinghai Lake was 30 thousand tons.']