According to The Yakima Herald, tribal groups which rely upon fish as a main source of food, may be at high risk for being exposed to too much mercury. Mercury is known to cause neurological damage, learning disabilities, and memory loss. While the effects of mercury consumption on tribal members, who eat up to 10 times as much fish as non-Indians, is unknown, the potential for danger is of concern to many. "My fear is that one of these times, none of our traditional foods is going to be safe to eat," said tribal fisherman Wilbur Slockish Jr., hereditary chief of the Klickitat band of the Yakamas. "A lot of development isn't geared toward health; it's geared toward economic benefit. Health is the least concern."