The question of future sources of food is posed with increasing frequency as the amount of arable land per person decreases with population growth. The role of the ocean as a food supplier is currently being explored. This learning experience is designed for secondary school students. It is divided into four major areas: (1) an overview, (2) marine plants, (3) fish protein concentrate, and (4) aquaculture. Each of the five lessons is intended for a daily 45-minute class period, but could be modified. (RH)