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首页> 外文期刊>International Journal of Environmental Research and Public Health >Gonadal Disorder in the Thinlip Grey Mullet (Liza ramada, Risso 1827) as a Biomarker of Environmental Stress in Surface Waters
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Gonadal Disorder in the Thinlip Grey Mullet (Liza ramada, Risso 1827) as a Biomarker of Environmental Stress in Surface Waters

机译：薄唇Mul鱼（Liza ramada，Risso 1827）中的性腺疾病是地表水中环境胁迫的生物标记

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摘要

The aim of this study was to evaluate the use of gonadal alterations in the thinlip grey mullet (Liza ramada) as a biological indicator in assessing aquatic ecosystems health, with particular emphasis to river ecosystems exposed to sewage discharges. For this purpose, the reproductive status and the presence of gonadal alterations were studied in 206 mullets collected from two sites on the low course of the Tiber River, downstream of a large urban sewage treatment plant and in the estuarine area, and from an uncontaminated pond considered as reference site. Intersex and irregularly shaped gonads were observed in 20.8% of the mullets from the most polluted site, and intersex gonads in 10.3% of those from the estuarine area. No alterations were detected in the fish from the reference site, which also showed distinct stages of gonadal development. Conversely, unclear stages of testicular and ovary development were observed in the fish from the two polluted river sites. The results of this study suggest that L. ramada may represent a sentinel species in environmental risk assessment and support the use of gonadal alterations of this species as a bioindicator for extensive monitoring of pollution in lower stretches of rivers and estuarine areas.
机译：这项研究的目的是评估稀薄鱼（Liza ramada）中性腺变化的用途，作为评估水生生态系统健康的生物学指标，特别强调暴露于污水排放的河流生态系统。为此，从台伯河下游河段，大型城市污水处理厂下游和河口地区的两个地点以及未受污染的池塘收集的206鱼中研究了繁殖状况和性腺变化的存在。被视为参考站点。在污染最严重的地方，the鱼中有20.8％出现了性交和不规则形状的性腺，而在河口地区的10.鱼中有10.3％出现了性交和性腺。在参考地点的鱼中未检测到变化，这也表明性腺发育的不同阶段。相反，在两个受污染的河岸地区的鱼中观察到睾丸和卵巢发育的不清楚阶段。这项研究的结果表明，L。ramada可能代表环境风险评估中的前哨物种，并支持将该物种的性腺改变用作生物指示剂，以广泛监测下游河段和河口地区的污染。

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