Thereafter, new groups of fish were placed in 

 the cage at 24-hour intervals until all fish in 

 one group survived for 48 hours. The percent- 

 age of survival for each group of caged fish was 



recorded at 24, 48, 72, 96, and 168 hours. 



Operations concerned with the removal 

 of live fishes from the poisoned ponds were 



