When questioned about it, it became clear that he had not even thought about the mathematics, though math is an important tool for other scientists. Nor could he come with any argument to back up his position.
Sharks are not trout. They are large animals that have to swim continuously forward just to keep an adequate supply of oxygen moving over their gills, and their strong horizontal undulations are like a heartbeat, a powerful automatic motion they cannot stop. Their desperate efforts to escape death while pulling with so much force against a big shark hook piercing their faces or internal organs, can cause serious internal and facial injuries. And as any wildlife rehabilitator soon learns through experience, serious injuries to wild animals are usually fatal without the benefit of treatment and supportive care.
According to the National Oceanic and Atmospheric Administration of the U.S. Department of Commerce (NOAA), two million, seven hundred thousand sharks were caught by sports fishermen in the U.S.A. in 2011. Since those were only the killings that were reported, this figure could be low compared with the true numbers killed if the toll from private boats that were not reported, were added in.