Sublethal ammonia exposure of Nile tilapia (Oreochromis niloticus L.): effects on gill, liver and kidney histology

The effects of exposures to sublethal ammonia concentrations on Nile tilapia (Oreochromis niloticus L.) were determined with respect to histology. The experiments were conducted for six weeks and with four different ammonia concentrations (control, 1, 2, 5, 10 mg l(-1) TA-N). Fish exposed to different ammonia concentrations displayed histopathologic alterations in the gills, liver and kidney. Gill tissues displayed hyperemia, chloride cell proliferation, fusion in secondary lamella, telangiectasis. Liver tissue revealed cloudy swelling and hydropic degeneration, whereas in kidney tissues hyperemia and glomerulonephritis were observed.     

中外环境行政诉讼原告资格比较研究

环境行政诉讼制度作为我国行政诉讼制度的重要组成部分,近年来对推动我国环境法制建设,促进环保领域依法行政发挥了十分重要的作用。本文分析了我国和西方环保先进国家在环境行政诉讼原告资格方面的立法现状,并进行比较研究,指出应借鉴了国外的相关立法及实践经验,以完善我国环境行政诉讼法律制度。