VI-132 



estuaries: sewage, heavy metals, industrial wastes, runoff from 

 urban and agricultural areas, oils, and a host of other materials 

 foreign to the estuarine environment. 



SUMMARY 



Wise management decisions require knowledge of the effects of 

 potentially toxic substances as determined by long-range bioassay 

 procedures extrapolated to natural conditions. Environmental levels 

 of toxicants which do not inhibit any portion of the life cycle, 

 food chain, behavior, or exert any detrimental sublethal effects 

 must be determined. 



