Abstract
The toxic effect of waterborne nitrite on the energy budget of juvenile grass carp was measured. In grass carp exposed to nitrite, the ingestion rates were unaffected, whereas assimilation efficiency and assimilation were reduced. The respiratory rate decreased with the nitrite exposure, most probably attributed to metahemoglobin formation in fish blood and to decreased swimming activity. The nitrogen excretion rate increased in fish exposed to nitrite. This could be a result of an increase in protein catabolism and may be an important physiological adaptation to offset the effects of nitrite toxicity. Nitrite exposure reduced energy channelized to somatic growth, the gross growth efficiency and survival in carp exposed to the highest nitrite concentrations.
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