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Effects of Three Organophosphorus Insecticides on Immature Hexagenia and Hydropsyche of the Upper Mississippi River
Author(s) -
Carlson Clarence A.
Publication year - 1966
Publication title -
transactions of the american fisheries society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.696
H-Index - 86
eISSN - 1548-8659
pISSN - 0002-8487
DOI - 10.1577/1548-8659(1966)95[1:eotoio]2.0.co;2
Subject(s) - bioassay , malathion , larva , biology , invertebrate , toxicology , ecology , pesticide
Hexagenia naiads were readily handled in bioassay, but Hydropsyche larvae showed high mortality until handling was reduced by providing small screens on which they built cases. The screens could then be transferred readily. Hydropsyche larvae were much more sensitive to Co‐ral and to Dylox than were bluegills, but the ratio of the 24‐hour TL m values of Malathion to Hydropsyche to bluegills was only about 1 to 10. Malathion was less toxic to Hexagenia naiads than to bluegills, and Co‐ral and Dylox gave only about a 1 to 10 margin for Hexagenia compared with bluegills.