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137 Cs in trout were markedly higher than those for charr in the three lakes. Values for individual trout exceeded 1000 Bq.kg-1 in Ennerdale and 500 Bq.kg-1 in Wastwater and Crummock Water, but values for charr never exceeded 350 Bq.kg-1. 137 Cs content increased with fish weight for trout from Wast­ water and therefore values were scaled to a standard weight in subsequent analyses. No similar relationships were found for trout in Ennerdale or Crummock Water, or for charr in all three lakes. Monthly mean values for 137 Cs in trout followed similar temporal patterns in the three lakes and a parabola provided a simple model for these changes. Cher­ nobyl deposition occurred early in May 1986 and maximum values in trout were in December 1986 in Wastwater, January/February 1987 in Ennerdale Water and March 1987 in Crummock Water. The exponential rate of decrease from these maxima did not differ significantly between the three lakes, and ecological half-lives of 137 Cs in the trout differed slightly, but not significantly, between lakes : 180 days for Wastwater, 194 days for Crummock Water and 249 days for Ennerdale Water. The equivalent value for Ennerdale charr was lower at 132 days, and it was impossible to fit models or calculate half-lives for Wastwater and Crummock charr. Maximum monthly geometric mean 137 Cs values in trout from six lakes and charr from four lakes were related to the initial concentration of 137 Cs in both water and sediment, and the maximum monthly geometric mean 137 Cs values obtained from the routine water samples. The rela­ tionship was curvilinear and approximated, but was not identical to, an asymptotic curve. No similar relationships were found with mean Ca or K levels in the lake water. Metabolic and diet differences may explain the lower 137 Cs levels in charr compared with trout and differences for the same species from different lakes may be due to limnological varia­ tions and differences between lakes in the nature of their sediments and catchment soils. Both points are discussed in detail.

annales de limnologie

Sources of variation in post-Chernobyl radiocaesium in brown trout,<i>Salmo trutta</i>L., and Arctic charr,<i>Salvelinus alpinus</i>(L.), from six Cumbrian lakes (northwest England)

Sources of variation in post-Chernobyl radiocaesium in brown trout,Salmo truttaL., and Arctic charr,Salvelinus alpinus(L.), from six Cumbrian lakes (northwest England)