Paul F. Worthington, 51, an agricultural project manager in Senegal for the Agency for International Development since 1979, drowned Sunday off the coast of Dakar.

A spokesman for the agency said Mr. Worthington and a companion both drowned when a small boat in which they were fishing capsized in high seas.

Mr. Worthington, who joined AID in 1962, had served with the agency here and in South Vietnam and Thailand. Earlier, he has served in South Vietnam with the Peace Corps and the International Volunteer Service.

A native of Lansing, Mich., he graduated from Michigan State University and then taught in Michigan. He served with the Air Force in Japan before beginning his government career.

Mr. Worthington was a former resident of Fairfax County and a member and lay leader of the Friendship United Methodist Church in Falls Church.

Survivors include his wife, Linda, and a daughter, Melissa, both of Dakar; a stepson, Kirby Worthington of Philadelphia; two stepdaugthers, Laurel and Judy Worthington, both of Fairfax County; a brother, Jack, of Grand Ledge, Mich., and a sister, Georgia Minard of Clarkston, Mich.

The family suggests that expressions of sympathy be in the form of contributions to the United Methodist Committee on Overseas Relief, c/o the Friendship United Methodist Church, Falls Church.