Joseph R Tomasso

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Fingerlings of channel catfish Ictalurus punctatus exhibited a significant exposure-dependent decrease in growth (measured by weight gain and increase in total length) and condition factor after 9 weeks of exposure to environmental ammonia. Concentrations of 5-hydroxytryptamine (5-HT) and dopamine in the brain decreased significantly whereas the ratio of(More)
Uptake of environmental NO2- by most freshwater fishes occurs at the gills where NO2- is actively transported into the blood by the Cl- uptake pathway. Some freshwater fishes do not concentrate NO2- in their plasma, regardless of environmental NO2- exposure and exhibit a high degree of resistance to NO2-. Recent studies indicate that freshwater-adapted(More)
During the past four decades, researchers have gained a good understanding of the effects of environmental nitrite on cultured aquatic animals and how to manage elevated environmental nitrite concentrations by the addition of chloride to the environment. Our understanding of the mechanisms of nitrite toxicity has largely paralleled the development of an(More)
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