The Wasatch Marine Aquarium Society is sponsoring a lecture by John Walch of Phoenix, Ariz., who directs marketing, distribution and captive coral propagation activities for the Aquatic WildLife Co. He is one of the world's leading marine fish and coral aquaculture experts.

Walch will deliver a free slide lecture on tropical coral reefs at 7 p.m. Thursday, May 1, at the Pipe and Tube Co.'s meeting room at 5575 W. 4700 South in West Valley City. Light refreshments will be served and an informal question and answer period will be held.For more information, call 296-1563 in Davis County, 731-6600 in Weber County or 963-5341 in Salt Lake County.