Use of <scp>A</scp>tlantic salmon, <i><scp>S</scp>almo salar</i> L., farm treatment data and bioassays to assess for resistance of sea lice, <i><scp>L</scp>epeophtheirus salmonis</i>, to emamectin benzoate (<scp>SLICE</scp>^®) in <scp>B</scp>ritish <scp>C</scp>olumbia, <scp>C</scp>anada