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Old 11-28-2010, 08:02 AM   #11
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From the article....
"Marine species are less susceptible to nitrite toxicity because chloride (at 19,350 ppm in seawater) outcompetes nitrite for the same uptake mechanisms. Nevertheless, it is possible for some marine fish to take up nitrite via both their gills and their intestines after swallowing seawater. For example, when exposed to 46 ppm nitrite in seawater, the European flounder (Platichthys flesus) takes up 66% of its nitrite via intestinal routes.24 Further, its internal nitrite concentration was found to remain below the ambient nitrite level in the water. At these concentrations, there was some alteration of internal biochemical parameters (such as an increase in methemoglobin levels from 4% in nonexposed fish to 18% of hemoglobin in exposed fish). Nevertheless, there were no mortalities under these conditions, and the difference between this result and what is often observed in freshwater fish at similar nitrite concentrations is attributed to differences in their internal nitrite concentrations."
"In the only published article26 that I could find showing toxicity tests to typical reef aquarium fish, Tom Frakes and Bob Studt exposed tank-raised clownfish (Amphiprion ocellaris; Figure 2) to nitrite concentrations ranging from 0 to 330 ppm in artificial seawater. Two of five fish died after a few days at 330 ppm, giving an LC50 not appreciably different from the other species listed in Table 1. At 33 ppm (the next dose down from 330 ppm), the fish were lethargic and breathing with difficulty, but otherwise experienced no lasting problems. At 3.3 ppm nitrite no effects were observed."

From the chart in the article showing fish and the nitrite levels which affected them:
Amphiprion ocellaris - 344

Chanos chanos - 344

Japanese eel
Anguilla japonica - 302

Common eel
Anguilla anguilla - 3,200

European Sea bass
Dicentrarchus labrax - 500-800

Spotted seatrout
Cynoscion nebulosus - 980

Diplodus sargus - 1,360

Gaidropsarus capensis - 2,210

Heteromycteris capensis - 2,440

Lithognathus mormyrus - 1,230

Atlantic salmon
Salmo salar - 146

Seriola quinqueradiata - 147

Synaptura kleini - 2,110

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