Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh; Department of Fisheries Management, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200, Bangladesh.
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh.
Environ Toxicol Pharmacol. 2023 Sep;102:104250. doi: 10.1016/j.etap.2023.104250. Epub 2023 Aug 16.
Fish inhabiting various trophic levels are affected differently as the presence of microplastic (MP) in the water column and their ingestion by fish varies. Walking catfish (Clarias batrachus) inhabits the bottom of the water bodies. To understand the effects of MP, we exposed C. batrachus to two types of MP - polyethylene terephthalate (PET) and low-density polyethylene (LDPE) for 60 days. After exposure, hematological indices, mainly red blood cells and hemoglobin levels decreased, and white blood cells increased significantly compared to the control group (p < 0.05). A significant increase in the levels of blood urea and glucose was observed, and serum glutamic pyruvate transaminase and serum glutamyl oxaloacetic transaminase activity remained elevated (p < 0.05). Histopathological examination of the liver, kidney, intestine, and gills showed morphological alterations. Moreover, MP exposure caused growth retardation (p < 0.05) in C. batrachus. Widespread pollution of water bodies by MP may impose serious ecological risks to bottom-feeding fish in Bangladesh.
栖息在不同营养级的鱼类受水中微塑料（MP）存在的影响不同，鱼类对 MP 的摄取也不同。步行鲶（Clarias batrachus）栖息在水体的底部。为了了解 MP 的影响，我们将 C. batrachus 暴露于两种类型的 MP-聚对苯二甲酸乙二醇酯（PET）和低密度聚乙烯（LDPE）中 60 天。暴露后，与对照组相比，血液学指标（主要是红细胞和血红蛋白水平）下降，白细胞显著增加（p<0.05）。血液尿素和葡萄糖水平显著升高，血清谷氨酸丙酮酸转氨酶和血清谷氨酰草酰基转氨酶活性持续升高（p<0.05）。肝脏、肾脏、肠道和鳃的组织病理学检查显示出形态改变。此外，MP 暴露导致 C. batrachus 生长迟缓（p<0.05）。孟加拉国水体中广泛存在的 MP 污染可能对底栖鱼类造成严重的生态风险。
