Comparative Toxicity of Larval Lampricide (TFM: 3-trifluoromethyl-4-nitrophenol) to Selected Benthic Macroinvertebrates

1 August 1975

journal article
Published by Canadian Science Publishing in Journal of the Fisheries Research Board of Canada

Vol. 32 (8) , 1455-1459
https://doi.org/10.1139/f75-168

Abstract

The acute toxicity of larval lampricide (TFM: 3-trifluoromethyl-4-nitrophenol) to 35 species of benthic macroinvertebrates was determined in 96-h flow-through tests. The 96-h LC50 values range from 2.1 mg/liter for blackfly larvae, Simulium pugetense, to values in excess of 38.0 mg/liter for species with heavy exoskeletons: crayfish (Orconectes propinquus), dobsonfly larvae (Chauloides sp), and dragonfly naiads (Ophiogomphus sp.) Younger individuals of the clam (Ligumia sp.) and the mayfly nymph (Ephemerella cornuta) were 2 to 1.5 times more sensitive than larger individuals of the same species. Early emergence of adults and increased locomotor activity were observed among some organisms exposed to sublethal concentrations.

Keywords

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