Gharaei A, Esmaili-Sari A, Jafari-Shamoshaki V, Ghaffari M
Department of Fisheries, Faculty of Natural Resource and Marine Science, Tarbiat Modares University, Noor, Mazandaran, Iran.
Fish Physiol Biochem. 2008 Dec;34(4):473-82. doi: 10.1007/s10695-008-9224-3. Epub 2008 May 29.
Recently, there have been reports of increasing amounts of mercury (Hg) in muscles of beluga (Huso huso, Brandet 1869) in the Caspian Sea which exceeds its guideline level for food in the UK. Our intensive effort was to investigate the effects of dietary methylmercury (MeHg) on Beluga bioenergetics. Beluga juveniles were fed with four diets containing MeHg (control: 0.04 mg kg(-1); low: 0.76 mg kg(-1); medium: 7.88 mg kg(-1); and high: 16.22 mg kg(-1)) for 70 days. There were significant differences in food consumption among the treatment groups. After 42 days, all individuals of the high dose died. After 35 and 70 days, all treatment groups (low, medium and high) showed a significant decline in their growth rate, unlike the control group. They also showed considerable lower specific growth rates (SGR) comparing to the control group. All treatment groups assimilated the dietary MeHg into their muscle tissue in a dose-dependent manner. Assimilation percent was significant among the treatment groups at days 35 and 70, but it was lower in the first 35 days than in the second 35 days. The data obtained from the dietary MeHg concentration and bioaccumulation rates were modeled for better natural resources management of the Caspian Sea.
最近，有报道称里海大白鲸（Huso huso，布兰代特，1869年）肌肉中的汞（Hg）含量不断增加，超过了英国食品的指导水平。我们集中精力研究膳食甲基汞（MeHg）对大白鲸生物能量学的影响。将幼年大白鲸用四种含甲基汞的饲料喂养70天（对照组：0.04毫克/千克；低剂量组：0.76毫克/千克；中剂量组：7.88毫克/千克；高剂量组：16.22毫克/千克）。各处理组之间的食物消耗量存在显著差异。42天后，高剂量组的所有个体死亡。35天和70天后，所有处理组（低、中、高剂量组）的生长速率均显著下降，与对照组不同。与对照组相比，它们的特定生长率（SGR）也显著较低。所有处理组均以剂量依赖的方式将膳食甲基汞同化到其肌肉组织中。在35天和70天时，各处理组的同化率存在显著差异，但在前35天低于后35天。根据膳食甲基汞浓度和生物累积率获得的数据进行建模，以更好地管理里海的自然资源。
