Academic article

Effects of chronic nitrite exposure on growth in juvenile Atlantic cod,Gadus morhua

Siikavuopio, Sten Ivar; Sæther, Bjørn-Steinar

Publication details

Journal: Aquaculture, vol. 255, p. 351–356, 2006

Publisher: Elsevier

International Standard Numbers:
Printed: 0044-8486
Electronic: 1873-5622

Open Access: none


The effects of nitrite concentration on growth and feed intake in juvenile cod, Gadus morhua, were examined. In the
experiment, juvenile cod with a mean (S.D.) live weight of 7.0 (1.9) g were exposed to four concentrations of nitrite [0, (control),
1.0 (low), 2.5 (medium) and 5 mg NO2–N l−1 (high)] for 96 days at 8.0 °C, salinity 33 ppt and pH 8.0.
No mortality occurred in any of the experimental groups throughout the study. Growth was significantly reduced in fish exposed
to all treatment levels, with reduced growth in the high concentration group in the first period of the experiment (day 1–31) and in
all experimental concentrations during later periods. No significant difference in feed intake or food conversion efficiency was
observed between treatment groups. The fish from the exposed groups displayed an acclimatory response to nitrite. These results
indicate that management of intensive aquaculture systems of G. morhua, should avoid levels of nitrite even at 1.0 mg NO2–N l−1
not to impair growth.
© 2005 Elsevier B.V. All rights reserved.