The Pittsburgh Pirates today announced they have added three players from within their organization to the 40-man roster and claimed right-handed pitcher Jimmy Barthmaier off waivers from the Houston Astros. Olivo Astacio (RHP) ? Signed by Pittsburgh as a minor league free agent on 3/9/06 after spending three seasons in the Boston farm system?Went 1-2 with 12 saves and a 4.93 ERA while striking out 91 batters in 65.2ip over 38 relief appearances between Hickory (A), Lynchburg (A) and Altoona (AA) in 2007?The 6?6? native of the Dominican Republic also ranked 14th in all of minor league baseball in strikeouts/per 9.0ip in 2007. Jimmy Barthmaier (RHP) ? Was claimed today off waivers from Houston?Spent 2007 season with Corpus Christi (AA) and has gone 30-27 with a 3.67 ERA in 98 career games (84 starts) in the minor leagues?Was Houston?s 13th round selection in the 2003 First-Year Player Draft?Led Carolina League with 134 strikeouts and 146.2ip and ranked second with 11 wins in 2006 and was rated by Baseball America as the Astros fourth-best prospect prior to the 2007 campaign. Ronald Belisario (RHP) ? Signed by Pittsburgh as a minor league free agent on 11/9/06?Native of Venezuela was originally signed by Florida as a non-drafted free agent on 8/2/99?Went 1-3 with four saves and a 3.97 ERA in 37 games between Lynchburg and Altoona in 2007?Was a member of Florida?s 40-man roster in 2004-05. Brian Bixler (INF) ? Pittsburgh?s second round selection in 2004 First-Year Player Draft?Was named to both the International League?s mid-season and post-season All-Star teams?Spent entire 2007 campaign with Triple-A Indianapolis, where he hit .274 with 23 doubles, five home runs, 51 RBI and 28 stolen bases in 129 games...Also shared the International League lead with 10 triples and ranked fourth with 77 runs scored...Led league shortstops in games (113) total chances (485) and double plays (80) in 2007?Hit a combined .302 in 133 games between Lynchburg and Altoona in 2006 and was named to the Carolina League mid and post-season All-Star squads?Was a non-roster invitee with Pittsburgh this past spring training. The Pirates also announced today that they have designated for assignment pitchers Josh Sharpless and Shane Youman, along with first baseman Josh Phelps. The 40-man roster now contains 40 players (24 pitchers, 2 catchers, 7 infielders and 7 outfielders).