Riviana Foods Inc. (Nasdaq: RVFD) reported a 10% increase in per share earnings for the first quarter ended October 1, 2000, to $0.34 per diluted share from $0.31 per diluted share for last year. Net income rose 3%, to $4.8 million, on sales of $101.5 million, compared to net income of $4.6 million, on sales of $105.