Tolerance to Low Concentrations of Dissolved Oxygen of Corbicula japonica

Abstract

The tolerance ofCorbicula japonicato low concentrations of dissolved oxygen (DO) was examined in laboratory experiments using individuals collected from Lake Shinji, Japan. Tolerance varied with water temperature. In anoxic conditions, C. japonicasurvived for more than 17 days at 10°C and 20°C, while all individuals at 30°C died with in 10 days. The tolerance to anoxia seemed no difference between juveniles and adults. Oxygen consumption of C. japonicawas higher at 30°C than 20°C. Even after conditions became anoxic due to respiration, all individuals maintained at 20°C survived more than 50 days. Individuals maintained at 30°C, however, died with in 8 days. The minimum oxygen requirement at 28°C with in a 30-day period was between 1.0 mg/l and 1.5 mg/l.