Mytella falcata and M. guyanensis are species of potential commercial value for aquaculture. The present study had the objective of estimating the mean tolerance (MT50) of both species of estuarine bivalves exposed to different water temperatures. Significant differences were observed through a variance analysis (p = 0.02) between cumulative mortality from both species. M. falcata was more resistant than M. guyanensis at a temperature of 33ºC, with a MT50 of, respectively, 87.42 and 53.36 hours of exposure. Although there was no mortality of the organisms exposed to the other temperatures, control (24°C), 27°C and 30°C, it was found that there is a decrease in the creation of byssus at temperatures of 30°C and 33°C, indicating a possible physiological stress.Key words: estuarine bivalves; aquaculture; mean tolerance; mortality curves. MORTALIDADE DE Mytella falcata E M. guyanensis SUBMETIDOS A DIFERENTES TEMPERATURAS RESUMOMytella falcata e M. guyanensis são espécies de potencial valor comercial para a aquicultura. O presente estudo teve como objetivo estimar a tolerância média (TM50) das duas espécies de bivalves estuarinos, expostas a diferentes temperaturas da água. Observaram-se diferenças significativas, através de análise de variância (p=0,02), entre a mortalidade acumulada de ambas as espécies, sendo M. falcata mais resistente que M. guyanensis, na temperatura de 33°C, com TM50, respectivamente, de 87,42 e 53,36 horas de exposição. Apesar de não ocorrer mortalidade dos organismos expostos às outras temperaturas, controle (24°C), 27°C e 30°C, constatouse a diminuição na formação de bisso nas temperaturas de 30°C e 33°C, indicando possível estresse fisiológico.Palavras-chave: bivalves estuarinos; aquicultura; tolerância média; curvas de mortalidade.
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