: Carp (Cyprinus carpio) from four sites and channel catfish (Ictalurus punctatus) from one site in the Red River of
the North in 1994 were analyzed for total mercury content. In carp, mercury concentrations differed among liver, muscle,
and whole bodies (0.11, 0.31, and 0.18 µg/g wet weight, respectively), between large and small size groups, but not location.
Mercury distribution in channel catfish tissues differed from that in carp. Liver and muscle tissue had similar mean
concentrations; each was higher than whole-body concentrations (0.16, 0.18, and 0.11 µg/g, respectively). Mercury
concentrations were not significantly different between the two size groups of channel catfish. Weighted-mean mercury
concentrations from seven individual fish agreed closely (usually within 10%) with concentrations determined on physical
composites of the same fish. The ratio of mercury in whole bodies to mercury in muscle was similar for both carp and
channel catfish. Historical data indicate that this ratio may be applicable to other species and locations. The ratio of mercury
in livers to whole bodies and muscle differed between carp and channel catfish, which may reflect physiological differences
between different trophic groups.
Additional Publication Details
Comparison of mercury concentrations in liver, muscle, whole bodies, and composites of fish from the Red River of the North
Canadian Journal of Fisheries and Aquatic Sciences