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Table 5. Toxicity to fish of commonly used fungicides.

Toxicity Classification	LC₅₀ (mg/L*)	Toxicity Classification	LC₅₀ (mg/L*)
super extreme High moderate	<0.01 0.01 - 0.10 0.11 - 1.0 1.1 - 10	slight minimal - nontoxic *1 mg/L = 1 part per million (ppm)	11 - 100 >100

Chemical Name	Commonly Used Trade Name	Toxicity Classification	96‑hour^a LC₅₀ (mg/L)
Chemical Name	Commonly Used Trade Name	Toxicity Classification	Rainbow trout^b	bluefill^b
benomyl	Benlate,	high	0.2	0.2
captan	Agrox, Captan, Captec	extreme‑moderate	0.06	0.12
carboxin	Vitavax	high‑moderate	>0.1	1.2
chlorothalonil	Bravo, Daconil,Terlanil	high	0.3	0.3
coppersutfate	Basicop,Bluestone	high‑moderate	0.14	0.8‑7.3^d
fenarimol	Rubigan	high	2	0.9
fosetyl ‑Al	Aliette	minimat	428	-
iprodione	Rovral	moderate	4	6
mancozeb	Dithane, Fore, Manzate	high‑moderate	2 (48h)	1
maneb	Maneb, Manex	high‑moderate	2 (48h)	1
metalaxyl	Ridomil	minimal	>100	>100
metiram	Polyram	high‑slight	1	85 (carp)
PCP	Pentachlorophenol	high	0.2 (48h)	-
PCNB	Terraclor	high	0.6	0.1
propiconazole	Alamo, Orbit,Banner, Tilt	high‑moderate	0.9	1.3
thiophanate‑methyl	Topsin	moderate	9.4	-
thiram	Thiram, Spotrete	high‑moderate	0.1	0.2
triadimefon	Bayleton	slight	14	11
triforine	Funginex	minimal	>1000	>1000
triforine	Ronilan, Ornalin	slight‑minimal	53	130 (guppy)
ziram	Ziram	moderate	5 (5h, goldfish)	-
^aToxicity values are determined by 96h exposure time unless otherwise specified ^bToxicity values are for rainbow trout and bluegill sunfish unless otherwise specified ^cToxicity depends on formulation ^dToxicity depends on pH ‑ more toxic in water with low alkalinity