 Spawning fishes and juveniles appear to be more sensitive to high TDS levels.For example, it was found that concentrations of 350 mg/l TDS reduced spawning of Striped bass ("Morone saxatilis") in the San Francisco Bay-Delta region, and that concentrations below 200 mg/l promoted even healthier spawning conditions.In the Truckee River, EPA found that juvenile Lahontan cutthroat trout were subject to higher mortality when exposed to thermal pollution stress combined with high total dissolved solids concentrations.