Microcystin concentrations in Nile tilapia (Oreochromis niloticus) caught from Murchison Bay, Lake Victoria and Lake Mburo: Uganda
Microcystin concentrations in Nile tilapia (Oreochromis niloticus) caught from Murchison Bay, Lake Victoria and Lake Mburo: Uganda
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DOI：
10.1007/s10750-009-0047-8
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发表时间：
2010-01-01
期刊：
影响因子：
2.6
通讯作者：
Nyakairu, George W.
中科院分区：
文献类型：
--
作者：
Semyalo, Ronald;Rohrlack, Thomas;Nyakairu, George W.
尼罗罗非鱼（Oreochromis niloticus L.）对乌干达两个富营养化的热带湖泊Mburo湖和Murchison湾、维多利亚湖的淡水鱼进行了微囊藻毒素（MCs）检测。采用液相色谱-质谱联用（LC-MS）法对鱼和水样中的MCs（RR、LR和YR）进行分析。还测量了物理化学参数，以确定这两个湖泊的状况。MC-RR是在Mburo湖和Murchison湾样品中检测到的最突出的MC，没有证据表明鱼类组织中MC浓度存在显著的季节变化。在两个研究湖泊的所有水样中均检测到MC。Mburo湖水体中MCs的平均浓度在干旱期较高（P < 0.05），Murchison湾水体中MCs的平均浓度在湿润期较高（P < 0.05）。Murchison湾鱼内脏中MC浓度与水样中MC浓度呈正相关（P < 0.05），而Mburo湖鱼内脏中MC浓度与水样中MC浓度无相关性。在富营养化的热带湖泊中，鱼类似乎对包括MCs在内的蓝藻毒素的毒性具有很高的耐受性。然而，有可能在其组织中积累这些毒素，并有可能将其转移到食物链的更高位置。由于样本量小，采样周期短，结果只能用来强调在这些湖泊尼罗罗非鱼MC积累的潜在风险。为了进行风险评估，需要开展进一步的研究。
Catches of the economically important Nile tilapia (Oreochromis niloticus L.) from two eutrophic tropical lakes in Uganda, Lake Mburo and Murchison Bay, Lake Victoria, were examined to determine the presence of microcystins (MCs) in gut, liver and muscle of the fish. Analysis for MCs (RR, LR and YR) in both fish and water samples was by liquid chromatography coupled with mass spectroscopy (LC-MS) method. Physico-chemical parameters were also measured to establish the status of both lakes. MC-RR was the most prominent MC detected in Lake Mburo and Murchison Bay samples, there was no evidence of significant seasonal variation in the concentration of MCs in fish tissue. MCs were detected in all water samples from both study lakes. The mean concentration of MCs in water was found higher in dry times for Lake Mburo (P < 0.05) and higher in wet times for Murchison Bay (P < 0.05). MC concentrations in the fish guts were positively related with MC concentrations in water samples from Murchison bay (P < 0.05), no such correlation was found in Lake Mburo. In eutrophic tropical lakes, fish seem to have a high tolerance to the toxicity of cyanotoxins including MCs. However, there is a possibility of accumulating these toxins in their tissue with the threat of transferring them higher up in the food chain. Due to a low sample size and short sampling period, the results can only serve to highlight the potential risk of MC accumulation in Nile tilapia in these lakes. Further studies are needed for the purpose of risk assessment.