Aboyadak Ibrahim M, Hadied Marwa Abou, Ali Nadia Gabr
National Institute of Oceanography and Fisheries, NIOF, Cairo, Egypt.
J Parasit Dis. 2024 Sep;48(3):581-592. doi: 10.1007/s12639-024-01695-x. Epub 2024 Jun 25.
Lake Burullus is an important source of fish production in Egypt; it produces 20.5% of the Egyptian fisheries' production. There is intense controversy about the heavy metal pollution in Burullus water and its effects on fish health and safety for human consumption. Heavy metals represent a major concern for aquatic life and could negatively affect fish health. Agricultural and industrial water drainage represents a considerable part of the lake water supply. The present work was conducted to determine heavy metal concentrations in lake water and blue tilapia musculature. Water samples were collected from six locations to determine cadmium, copper, lead, zinc and iron. Sixty fish samples were also collected from the same sampling points to assess the prevalent parasites infesting fish and to determine the heavy metal (Cd, Cu, Pb, Zn and Fe) concentrations in fish musculature then study the relationship between heavy metals concentration and prevailing fish parasites. Results indicated that 53.34% of the examined fish were infested with encysted metacercaria. , , and were retrieved from gills, musculature, hepatopancreas and the posterior kidney. The parasitic intensity in fish tissues was between 1 and 9 cyst g. was identified using the polymerase chain reaction in the gill tissues of 16 fish. The gill parasitic copepod was identified in one fish. Degenerative changes such as thickening, corrugation, and destruction of gill filament are the most dominant pathological changes in infested fish gills. Heavy metal concentrations in water samples were at normal levels, except for copper and iron in the southern part of the lake. All heavy metals in fish musculature were below the permissible limits. The parasitic infestation was more dominant in the northern part of the lake than in the southern region; this could be due to elevated copper concentration in the southern part of the lake that could negatively affect the survival of the first intermediate host and parasite cercaria. In conclusion, captured fish from Lake Burullus were safe for human consumption, and heavy metal pollution in lake water does not represent a severe risk.
布鲁卢斯湖是埃及重要的鱼类生产地，其产量占埃及渔业总产量的20.5%。关于布鲁卢斯湖水体中的重金属污染及其对鱼类健康和人类食用安全性的影响，存在激烈的争议。重金属是水生生物的主要担忧因素，可能对鱼类健康产生负面影响。农业和工业排水占该湖供水的相当一部分。本研究旨在测定湖水中以及尼罗罗非鱼肌肉组织中的重金属浓度。从六个地点采集水样以测定镉、铜、铅、锌和铁的含量。还从相同采样点采集了60份鱼类样本，以评估感染鱼类的常见寄生虫，并测定鱼类肌肉组织中的重金属（镉、铜、铅、锌和铁）浓度，进而研究重金属浓度与常见鱼类寄生虫之间的关系。结果表明，53.34%的受检鱼类感染了囊蚴。在鳃、肌肉、肝胰腺和后肾中发现了[具体寄生虫名称未给出]。鱼类组织中的寄生强度为每克组织1至9个囊肿。在16条鱼的鳃组织中通过聚合酶链反应鉴定出了[具体寄生虫名称未给出]。在一条鱼中鉴定出鳃寄生桡足类[具体寄生虫名称未给出]。鳃丝增厚、起皱和破坏等退行性变化是受感染鱼鳃中最主要的病理变化。除了湖南部的铜和铁外，水样中的重金属浓度处于正常水平。鱼类肌肉组织中的所有重金属含量均低于允许限值。寄生虫感染在湖的北部比南部更为普遍；这可能是由于湖南部铜浓度升高，可能对第一中间宿主和寄生虫尾蚴的生存产生负面影响。总之，从布鲁卢斯湖捕获的鱼类供人类食用是安全的，湖水中的重金属污染并不构成严重风险。
