Fort Hays State University's Department of Biological Sciences is hosting a thesis defense presentation by Eric Johnson, Altus, OK, graduate student, at 2:30 p.m. Wednesday, Oct. 27, in Albertson Hall, room 235.

Johnson, who earned a bachelor of science degree from the University of Oklahoma, will present "Population Characteristics of the Introduced White Perch (Morone Americana) In the Ninnescah River System and Assessment of Community Structure After Invasion."

The event is free and open to the public.