Effects of hypoxic exposure on survival of larval grass carp (Ctenopharyngodon idella)

We determined the effects of hypoxia exposure on grass carp larvae survival within certain developmental periods. Our goal was to establish a baseline lethal DO concentration based on both time of exposure and water temperature. In 2023 we used 6 different low dissolved oxygen concentrations (0.2, 0.4, 0.6, 0.8, 1.0 and 1.2 mg/L plus a control of 7.0 mg/L) to test survival during short term exposures (less than 12 hours) over 3 water temperatures (23, 25 and 28 degrees Celsius). In 2024 we used 3 different low dissolved oxygen concentrations (1.5, 2.5 and 3.5 mg/L plus a control of 7.0 mg/L) to test survival over longer exposure times (24, 48 and 72 hours) at just one temperature, 26 degrees Celsius.