from the thread you posted
"Growth of the shrimps reared at 4, 8, and 20 mg/L nitrite-N was significantly lower than control animals and those reared at 2 mg/L nitrite-N after 20 days. EC50 (concn. that reduced growth by 50% of that of the controls)"
looks like even 4mg/l is having an advers effect to me. and it was stated that the effect in salt water was not as great as in fresh water. so that explains a lot there.
Steve
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