31. California regulations consider mercury levels above 0 . 3 ppm high enough to warrant further study. 32. But beginning in the late 1980s, mercury levels began to spike, peaking in the early 1990s. 33. These factors when presented with high mercury levels , are home to the bacteria that process it. 34. The study monitored 67 patients as they reduced their fish intake and subsequently their bodies'mercury levels . 35. That means the fish are concentrated where MMS sediment samples indicate mercury levels may be highest. 36. :: : : : : Eating seagull bagels is a health risk because of high mercury levels . 37. In salt water, the most voracious predatory fish seem to have the worst mercury levels , scientists agree. 38. The government's original benchmark had been mercury levels of 50 parts per million detected in people's hair. 39. A rise in mercury levels in water could cause the disappearance of mimic shiners in some areas. 40. So mercury levels in bass haven't changed.
