The Inglis auction house’s Australian Easter yearling sale opened Tuesday with double-digit gains in the average and median prices.Tuesday’s first session sold 128 horses, down from last year’s 153, and lost 6 percent in gross as the aggregate fell to $30,904,200. But the average price rose 13 percent to about $241,439, and the median gained 33 percent as it reached about $194,000. The buy-back rate cast a slight shadow, climbing from last year’s 17 percent to 24 percent.Trainer Gerald Ryan paid the opening session’s highest price, about $970,000, for a three-quarter-sister to two-time Australian group winner Rothesay. The filly is by the highly successful Australian sire Redoute’s Choice and out of Schiaparelli, a winner by Woodman. She sold as part of the Emirates Park consignment. The Inglis Australian Easter yearling sale was to continue through Thursday.