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11-08-2010, 02:52 PM #1
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Bioaccumulation, distribution and retention of 63Ni2+ in the Brown trout (Salmo trutt
By Hans Tjalve, James Gottofrey, Kathleen Borg
Water Research, Volume 22, Issue 9, September 1988, Pages 1129-1136, ISSN 0043-1354, DOI: 10.1016/0043-1354(88)90007-3.
Brown trout, Salmo trutta, were exposed to water containing 0.1 or 10 [mu]gl-1 of 63Ni2+ for 1 or 3 weeks. Additional trout were exposed to 0.1 or 10 [mu]gl-1 of 63Ni2+ during 3 weeks followed by a 1- or 3-week period without exposure to the metal. At termination of the experimental periods the uptake and distribution of the 63Ni2+ in the fishes were determined by whole-body autoradiography and liquid scintillation spectrometry. The average whole-fish concentration of 63Ni2+ in the fishes was about 3 times higher than the concentration of 63Ni2+ in the water after 1 week's exposure and about 7-8 times higher than in the water after three weeks' exposure. There was no evidence of saturation of the uptake of the 63Ni2+ at 10 [mu]gl-1 as compared to 0.1 [mu]gl-1. The distribution pattern of the 63Ni2+ within the fishes included an accumulation in the blood, the head and trunk kidney, the gills, the connective tissues, the cerebrospinal fluid and the contents of the stomach and the intestines. After 3 weeks without 63Ni2+-exposure the average whole-fish concentrations decreased to about 40% of the levels observed immediately after the 3 week exposure. The amounts of 63Ni2+ in the kidneys in relation to other tissues were higher in the groups of fishes exposed to the 63Ni2+ for 3 weeks followed by the 1- or the 3-week period without 63Ni2+ as compared to the fishes killed immediately after the 3-week 63Ni2+-exposure. The same observation was made for the nervous tissues of the brain and spinal cord, although this uptake in all groups of fishes was rather low. In the gills there was a more rapid decrease in the concentration of 63Ni2+ than the average whole-fish-decrease. Our results show that there is a moderate bioaccumulation of nickel by fishes from the water.
Keywords: nickel; bioaccumulation; brown trout