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Acute Toxic Effects of Two Lampricides to Twenty-one Freshwater Invertebrates

1976; Wiley; Volume: 105; Issue: 2 Linguagem: Inglês

10.1577/1548-8659(1976)105 2.0.co;2

1548-8659

Robert P. Rye, Everett Louis King,

Aquatic Invertebrate Ecology and Behavior

We conducted laboratory static bioassays to determine acute toxicity of two lampricides7mdash;a 70% 2-aminoethanol salt of 5,2′dichloro-4′-nitrosalicylanilide (Bayer 73) and a mixture containing 98% 3-trifluoromethyl-4-nitrophenol (TFM) and 2% Bayer 73 (TFM-2B)7mdash;to 21 freshwater invertebrates. LC50 values were determined for 24-h exposure periods at 12.8 C. Organisms relatively sensitive to Bayer 73 were a turbellarian (Dugesia tigrina), aquatic earthworms (Tubifex tubifex and Lumbriculus inconstans), snails (Physa sp.) and (Pleurocera sp.), a clam (Eliptio dilatatus), blackflies (Simulium sp.), leeches (Erpobdellidae), and a daphnid (Daphnia pulex). The invertebrates most sensitive to TFM-2B were turbellarians, aquatic earthworms (Tubifex), snails (Physa), blackflies, leeches, and burrowing mayflies (Hexagenia sp.). Bayer 73 was generally much more toxic to the test organisms than TFM-2B. At lampricidal concentrations, TFM-2B was more highly selective than Bayer 73 against larval sea lampreys (Petromyzon marinus).