Figure 4 Typical set-up for producing sexual coral recruits in aquaculture: gametes of broadcast spawning species are collected in the field using
plankton nets (S1). Gametes areex situfertilized and reared in the laboratory for several days (S2), whereas brooders usually release settlement-competent larvae following the internal fertilization and embryogenesis; larvae can be collected from the water surface using cone-shaped larvae traps
(B1 +2). Larvae of both reproductive groups are basically treated in the same way and added to an aquarium with settlement tiles placed on the bottom. No filtration is applied; water movement is achieved with airlifters (3). After the metamorphosis of larvae is complete, primary polyps are transferred to recirculation systems for further grow-out (4). As the juveniles gain size, they need more culture space (5).