"Introduction to Aquaponics," a classroom session, takes place from 9:15 a.m. to noon, and a workshop for building an aquaponics system takes place from 1 to 4 p.m., Sunday, Jan. 12; $20 for each session. The afternoon session includes demonstrations of different options for aquaponics systems and an instruction manual with sources for parts and supplies. Reservations for both sessions are required by Saturday, Jan. 11. Participation in the introduction is recommended before taking the workshop. Call 290-5939, or visit meetup.com/Tucson-AquaPonics-Project/events/155794222 for reservations and more information.