OMAHA, Neb. -- The wisdom of billionaire Warren Buffett will be on display again next weekend when he fields questions from a throng of Berkshire Hathaway shareholders.

And a group representing American Indian tribes and commercial fishermen from California and Oregon will again try to pressure Buffett to order the removal of four dams on the Klamath River owned by one of Berkshire's utilities so salmon can spawn again.

About 30,000 people are expected to fill an Omaha arena Saturday for the holding company's annual meeting. The hours-long question-and-answer period is usually the highlight of the meeting.

Some of the questions Buffett faces may not be friendly.

The group from the Pacific Northwest plans to protest outside the meeting and ask tough questions inside about PacifiCorp's dams.

When asked about the Klamath last year, Buffett said state and federal regulators would be the ones to decide whether the dams should be removed.

Buffett said he cannot interfere in the operating decisions of Berkshire's PacifiCorp subsidiary because he swore he wouldn't in an affidavit submitted to Oregon utility regulators.