If few individuals of the indicator species die during the test period, the country will not take action on water pollution. If, after the test, the country does not require that pollution levels be reduced, then few or none of the individuals of the indicator species died as a result of the test. Under the new rules, certain small species will be introduced into water samples taken from 2, 000 sites around the country. In the country in question, there are 1, 550 factories and sewage treatment plants that discharge pollutants illegally.
Small species, such as fathead minnows and waterfleas, can be used to uncover the quantity of toxic chemicals being dumped into rivers and streams. Under new rules issued in a certain country, these "indicator" species will be used to test the effluent pouring out of sewage treatment plants and factories among the country' s waterways. If many of these animals die as a result of the test, the country is going to require that pollution levels be reduced. The new rules will apply to about 450 of the 2, 000 factories and sewage treatment plants that legally discharge into the country' s rivers and streams.
Which one of the following can be inferred from the passage above?