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Abstract：
Fish larvae of four SE Brazilian estuaries were investigated to assess if the larval fish assemblages reflect the ecological status of estuaries. All samples were collected in the same water mass to guarantee similar natural water parameters, assuring that major differences among estuaries were related to anthropogenic pressures. Water temperature, oxygen, pH, chlorophyll a, faecal coliforms, nutrient load and total particulate matter were obtained at each sampling area. A pressure index was used to assess the overall anthropogenic pressures acting in each estuary. Results showed that fish larvae were sensitive to water contamination, reducing the diversity and especially exhibiting a high dominance of few species. Furthermore, this study reinforced the idea that the high sensitivity of fish larvae can increase the accuracy of the environmental assessments when tackling short-time events of hydrological controls (physical barriers and control of the freshwater input), representing an advance in the water ecological quality assessments.
摘要：
对巴西东南部四个河口的鱼类幼虫进行了调查，以评估幼虫鱼类组合是否反映了河口的生态状况。所有样品都收集在相同的水块中，以确保相似的天然水参数，确保河口之间的主要差异与人为压力有关。水温,氧气,pH值,叶绿素a,粪便大肠杆菌，在每个采样区域获得营养负荷和总颗粒物。压力指数用于评估每个河口的总体人为压力。结果表明，鱼幼虫对水污染敏感，减少多样性，特别是表现出少数物种的高度优势。此外，这项研究加强了这样一种观点，即鱼类幼虫的高灵敏度可以提高环境评估的准确性，当处理水文控制的短期事件（物理障碍和淡水输入的控制）时，代表了水生态质量评估的进步。
