US EPA

6448374 

Journal Article 

Toxicity of 3-trifluoromethyl-4-nitrophenol (TFM), 2 ' ,5-dichloro-4 ' - nitrosalicylanilide (Bayer 73), and a 98:2 Mixture to Fingerlings of Seven Fish Species and to Eggs and Fry of Coho Salmon 

Bills, TDM 

1976 

Toxicity was determined of the lampricides 3-trifluoromethyl-4-nitrophenol (TFM) and 2 ',5-dichloro-4 ' - nitrosalicylanilide (Bayer 73) and a 98:2 mixture of these compounds against fingerlings of seven species of fish - brown trout (Salmo trutta), rainbow trout (Salmo gairdneri), lake trout (Salvelinus namaycush), brook trout (Salvelinus fontinalis), channel catfish (Ictalurus punctatus), bluegill (Lepomis macrochirus), and yellow perch (Perca flavescens) - and to eggs and fry of coho salmon (Oncorhynchus kisutch). Channel catfish were the most sensitive to TFM and brown trout to Bayer 73. Bluegills were the most resistant to both TFM and Bayer 73. The toxicity of TFM and Bakyer 73 individually was influenced far more by pH than was the mixture in standard laboratory tests with rainbow trout. Toxicity of the mixture was additive or less than additive to all species and life stages tested. The mixture was slightly more toxic to larval lampreys (Petromyzon marinus) than to other fish in comparable laboratory toxicity tests. The margin of safety was narrow, however, when the 24-h toxicity for brown trout or rainbow trout was compared with the 24-h LC99 for sea lamprey larvae. (Katz) 

; Toxicity; Bioassay; Mortality; Salmon; Pesticides; Hydrogen ion concentration; Fish eggs; Juvenile fish; Brown trout; Rainbow trout; Lake trout; Brook trout; Channel catfish; Perches; Laboratory tests; Sunfishes; Yellow perch; Lampreys/