Toxicity of
hydrogen peroxide to pre-exposed young-of-the-year walleye: Effects of water
hardness and age of fish
C. Tripi, P.R. Bowser-2001
Journal of the World Aquaculture Society, 32(4):
416-421 (from Current Contents)
Abstract :
Young-of-the-year (Age 0+) walleyes Stizostedion
vitreum were exposed to hydrogen peroxide at 10 mg/L for 1 h in an effort to
increase their tolerance to subsequent exposures to hydrogen peroxide at
therapeutic concentrations that are considered to be toxic. The effects of
age of fish and water hardness on the effectiveness of this pre-treatment
protocol were examined. Trials were performed in fish at four ages (50-d,
60-d, 86-d, and 95-d post-hatch) and under three different water quality
conditions (soft water: hardness = 64.4 mg/L, alkalinity = 56.5 mg/L; medium
hard water: hardness = 103.3 mg/L, alkalinity = 51.5 mg/ L; hard water:
hardness = 130.3 mg/L, alkalinity 92 mg/L). A benefit of pre-treatment was
only observed when it was performed under hard water conditions and only
with walleyes at 60- and 86-d post hatch. The pre-treatment protocol
appeared to be detrimental to fish in the youngest age group (50-d
post-hatch) under all three water quality conditions.
(Cornell Univ, Coll Vet Med, Ithaca, NY 14853, USA)