Please do not do this

Alternate sampling techniques, such as eDNA and muscle plugs, may be used if the technique meets sampling design and criteria.  DNA and tissue plugs (biopsies) are humane.  The number of lethal samples needs to be reduced to zero.  ​Please switch to Non Animal Methods for all toxicology research and Federal Environmental Quality Guidelines.  https://www.change.org/p/stop-testing-sewer-water-on-laboratory-fish