Toxicity of Ten Chemicals Commonly Used in Aquaculture to the Black Eel Stage of the American Eel1

Acute, 96‐hour toxicity tests were conducted to determine the resistance of the black eel stage of the American eel (Anguilla rostrata) to several chemicals used in aquaculture. Static tests were conducted at 22°C in deionized water reconstituted to a hardness of 40–48 mg/liter, an alkalinity of 30–35 mg/liter, and pH of 7.2–7.6. A 96‐hour LC50 value was calculated for each chemical tested. Chemicals tested and their 96‐hour LC50 values are: malachite green, 0.54 mg/liter; potassium permanganate, 4.86 mg/liter; salt, 21.45 g/liter; formalin, 224.49 mg/liter; Dylox, 1.32 mg/liter; Furanace, 0.96 mg/liter; antimycin A, 0.28 μg/liter; Noxfish, 50.49 μg/liter; copper sulfate, 3.20 mg/liter; and Diquat, 55.44 mg/liter.