Induction of nitric oxide synthase in channel catfish Ictalurus punctatus by Edwardsiella ictaluri

Abstract

Channel catfish Ictalurus punctatus were injected intraperitoneally with live cells of EdwardsieUa ictaluri and held in flow-through tanks for 5 d. The head kidneys from injected and control flsh were removed and the nitric oxide synthase activity measured. Activities found were 0.16 t 0.05 nmol L-citrulline formed m g -' protein min-' for the injected fish, and 0.002 nmol mg-' min" for the control fish.