text: QA practices within an aquatic toxicology laboratory must address all activities that affect the quality of the final effluent toxicity data , such ( 1 ) effluent sampling and handling ; ( 2 ) the source and condition of the test organisms ; ( 3 ) condition and operation of equipment ; ( 4 ) test conditions ; ( 5 ) instrument calibration ; ( 6 ) replication ;
  
  ###
  
  The practices in QA must improve a number of aspects .