Here is a link from Oregon State Univ about copper sulfate.
http://npic.orst.edu/factsheets/cuso4tech.htmlSee specific information near the bottom of the link in headings of:
Environmental Fate - Water
Ecotoxicity Studies - Fish & Auatic Organisms.
Usual suggested rate of dosage when applying CuSO4 is 1 part per million final concentartion in the pond for killing algae. When reading the concentrations for the toxicity of Cu in various tests for fish and aquatic organisms remember that
1 ppm = 1000 micrograms per Liter (ug/L) or 1000 parts per billion (ppb).
Many of the results are ug/L or ppb reported as
