48 



JOHN VLASTELICLA 

 placing numbers of juvenile salmon In various arrange- 

 ments of live boxes and holding tanks throughout the zones 



4 of acute pollution. Fish reactions to waste level and 



5 water quality were monitored at regular Intervals. The 

 5 parameters measured Included sulfite waste liquor, dls- 



7 solved oxygen, pH, hydrogen sulfide and total sulfides, 



8 acomonla , and In some cases residual chlorine. 



9 More than 100 tests were made and hundreds 



10 of fish were killed. The results showed that while con- 



11 ditlons In the zone of acute pollution would for short 



12 periods of time permit successful through-migration of 



13 young salmon, conditions of lethal toxicity also developed, 



14 often very rapidly. Once stricken, the test fish quickly 



15 became disoriented and showed erratic behavior and aimless, 



16 non-direct lonal swimming. They showed no avoidance 



17 behavior. Death usually followed rapidly. 



18 The numbers of wild juvenile salmon 



19 actually killed by lethal conditions In these zones 



20 cannot be determined. In the first place, these young 



21 j fish always sink when they die. Consequently, kills of 



22 juvenile salmon are not evidenced by floating dead fish 



23 as has been observed in these areas with other types of 



24 fish. 



25 Secondly, in cases resulting in mortality. 



