เรียบเรียง
2. Materials and methods
2.1. Study area
The region under study (Fig. 1) includes different environments where the silverside is one of the most important commercial and recreational fish species. The de la Plata River (35° 3'5.09"S-57° 2'47.79"W) is a 300-km wide estuary that discharges into the Atlantic Ocean (Guerrero et al., 2010). The salinity ranges from 0.04 to 25 g L− 1 (north–south), and the maximum depth ranges from 5 to 25 m (Guerrero et al., 2010). The Barrancas (35°52'35.29"S-58°3'19.88"W) and Adela (35°40'51.47"S-58°0'4.79"W) Lagoons (Pampean plain, Buenos Aires, Argentina) are shallow alkaline ecosystems with circulation pattern characteristics of polymictic lakes due to the nearly continuous vertical mixing that promotes a high concentration of suspended particulate matter and low transparency (Miretzky and Fernández Cirelli, 2014). It has a maximum depth of 2 m and salinity of less than 1 g L− 1. The Chasicó Lake (38°36'39.41"S-63°4'48.68"W) is located in a transition zone between the Pampean and Patagonian regions. It has a maximum depth of 16 m and salinity above 27 g L− 1 (Kopprio et al., 2010).