Attendees of an upcoming science event will learn about changes to native fish populations in the Rogue Basin.

The Rogue Riverkeeper Winter Speaker series talk, "Wonders of the Rogue," will be from 5:30 to 7:30 p.m. Thursday, Feb. 23, at 4 Daughters Irish Pub, 126 W. Main St., Medford.

Guest speakers will include Ryan Battleson, Salmon & Trout Enhancement Program biologist at the Oregon Department of Fish and Wildlife, and Robert Coffman, hydrogeologist and president of Katalyst Consulting.

Snacks will be provided, but additional drinks and food and can be purchased.

Visit www.rogueriverkeeper.org for more information.