OAKLAND — The Oakland Athletics acquired left-hander Fernando Abad from Washington on Monday and sent Class A outfielder John Wooten to the Nationals.

Abad could help bolster a talented bullpen that has likely has lost closer Grant Balfour in free agency, with the ninth-inning spot expected to be filled from within by Sean Doolittle or Ryan Cook.

The 27-year-old Abad, who was designated for assignment last Wednesday, went 0-3 with a 3.35 ERA in 39 appearances for the Nationals last season. He spent 2010-12 with the Houston Astros and has a career record of 1-14 with a 4.56 ERA in 127 outings.

Wooten batted .257 with 20 home runs and 69 RBIs for Class A Beloit this year. He was a 37th-round selection by Oakland in the 2012 amateur draft out of East Carolina.

How to help

State scientists are seeking help with data collection and other activities, as well as observational accounts, photos and videos related to the urchin barren. Shared images and information should, if possible, include the date, location and depth at which they were acquired. Contact Cynthia Catton at Cynthia.Catton@wildlife.ca.gov or 875-2072.