Illogical as it sounds, however, these behavioral changes and their resulting impact on the economy and tax revenue have always been ignored when evaluating potential tax changes.
As unthinkable as that proposal sounds to modern ears, in those days no one had even conceived of an environmental impact study and upstream towns along the river turned out to be no match for big city political power.
Noise pollution could significantly impact communication between fish: so far over 800 species of fish from 109 families are known to produce sounds, generally broadband signals at less than 500Hz.