ABSTRACT 



A portable resistivity (or conductivity) meter is easily used in fishery 

 investigations to obtain rapid and precise measurements of the electrical resistance 

 (or conductance) of waters. These measurements can be used to estimate the total 

 dissolved solids content of waters, to facilitate the selection of appropriate gear for 

 efficient electrofishing, and to determine the velocity, stretch-out, dilution, and 

 effective range of a solute over miles of a stream in conjunction with chemical re- 

 clamation operations. Applications of resistivity measurements on Appalachian 

 streams are discussed. 



