Environmental changes have been associated with natural climatic variability or human activity. Water resources management is, perhaps, the most drastic change observed in the coastal environment. However, external forcings such as the El Niño event have important implications in the global and regional hydrological balance. These environmental changes have an impact on the density and biomass of the ichthyofauna in the Terminos Lagoon (TL) for the past 30 years, presumably, associated with variations in the temperature and surface salinity of the sea. Therefore, in the present study, δ¹⁸O was quantified in otoliths of two important species due to their dominance: Stellifer lanceolatus and Eucinostomus gula, and to understand the environmental changes reflected in both species. The δ¹⁸O was analyzed in otoliths of these two species captured in 1998/1997, 2006/2007 and 2016/2017 and were compared with in situ temperature and salinity data. Sea surface temperature and salinity increased by 2 °C and 9, respectively, between 1997 and 2017. Stellifer lanceolatus δ¹⁸O values was in isotopic equilibrium with seawater calcite; while, E. gula is not in isotopic equilibrium. The δ¹⁸O of S. lanceolatus and E. gula varied significantly with the increase in salinity (R² = 0.8987 and R² = −0.2964) and not with the sea surface temperature. S. lanceolatus is an excellent bioindicator of changes in sea surface salinity in this region of the Gulf of Mexico.

环境变化与自然气候变化或人类活动有关。水资源管理也许是沿海环境中观察到的最剧烈的变化。但是，诸如厄尔尼诺事件之类的外部因素对全球和区域水文平衡具有重要影响。在过去的30年中，这些环境变化对特米诺斯泻湖（TL）中鱼腥藻的密度和生物量产生了影响，大概与海洋温度和表面盐度的变化有关。因此，在本研究中，δ ¹⁸ O的两种重要品种耳石由于他们的优势量化：Stellifer石斑鱼和Eucinostomus古拉，并了解两个物种反映的环境变化。的δ ¹⁸ ö在1997分之1998，2006/2007和2017分之2016捕获这两个物种的耳石进行分析，并用进行了比较原位温度和盐度的数据。海面温度和盐度分别增加2℃和9日，1997年和2017年之间Stellifer石斑鱼δ ^18个O值是与海水方解石同位素平衡; 同时，古拉肠埃希菌不处于同位素平衡状态。的δ ¹⁸的O- S.石斑鱼和E.古拉与盐度（的增加研发显著变化²  = 0.8987和R ² = -0.2964），而不是海面温度。小号。lanceolatus是该墨西哥湾地区海表盐度变化的出色生物指标。