Temperature tolerance of some estuarine fishes

Thermal tolerance of European Sea Bass (Dicentrarchus labrax) juveniles acclimated to three temperature levels

“…Similarly, Rajaguru (2002) also reports a rise in CTMax from 39.75 1C to 43.5 1C in Etroplus suratensis and from 40.75 1C to 43.15 1C in Therapon jarbua on a 15 1C increase in acclimation temperature. In general, tropical marine fish species have CTMax approaching or even exceeding 40 1C (Mora and Ospina, 2001;Rajaguru and Ramachandran, 2001;Eme and Bennet, 2009). Rajaguru (2002) found extremely high (44.5 1C) CTMax values for Asian sea bass (Lates calcarifer) and for a mullet species Liza dussumeri.…”

Acute thermal tolerance of tropical estuarine fish occupying a man-made tidal lake, and increased exposure risk with climate change

“…The narrow range in AET has been found in other studies using estuarine fish species (Cheng et al, 2013;Heath et al, 1993;Rajaguru and Ramachandran, 2001), but also tropical freshwater fish species (Burrows and Butler, 2012). Table 1 provides an overview of the percentage of time that each fish species exceeded the thresholds using the surface and bottom logging temperature data.…”

“…The acclimation tank temperature used in our experiment (28 o C) is commonly reported in the literature (Burrows and Butler, 2012). Clearly these data show that aquatic organisms inhabiting transitional coastal waters are exposed to constantly fluctuating water temperature, which raises questions regarding the validity of acclimating at a constant temperature (Rajaguru and Ramachandran, 2001); it would seem advisable to simulate the natural diel temperature periodicity of the animals' environment during acclimation (Coulter et al, 2016). We advocate here that fluctuating acclimation temperatures are probably most appropriate in laboratory experiments, however, based on our field measured temperature data, determining what diel range to simulate would be difficult.…”

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“…It is also suggested that the typical seasonal acclimation in subtropical climates allows fish to be more tolerant to higher temperatures in summer or lower temperatures in winter (Bevelhimer & Bennett, 2000). In general, tropical marine fish species have been reported to have CTMax values approaching or even exceeding 40 °C (Mora & Ospina, 2001;Rajaguru & Ramachandran, 2001;Eme & Bennet, 2009). Extremely high CTMax values (44.5 °C) for Asian sea bass (Lates calcarifer) and for a mullet species (Liza dussumeri) have been reported in the study of Rajaguru (2002).…”