THE USE OF GOURAMY (OSPHRONEMUS GORAMY) REARING WASTEWATER FOR GROWING ROMAINE LETTUCE (LACTUCA SATIVA L. VAR. LONGIFOLIA) IN AQUAPONIC SYSTEMYUSRIANTI PURWANDARI, HEFNI EFFENDI, AND YUSLI WARDIATNO3Abstract Increasing fish cultivation activity triggers negative impact on the environment. An effort likely applied to cope with this problem is phytoremediation with aquaponics system. Aims of this study were to process organic waste from the cultivation of gouramy, and then the processed waste is utilized as a medium for growing romaine lettuce in recirculation systems and to compare the effectiveness of hydroponics-aquaponics recirculation system on romaine lettuce growth. Organic waste such as feed residuals and feces from the cultivation of gouramy could be processed with phytoremediation by romaine lettuce. The organic material after the process of decomposition could be utilized for romaine lettuce growth. Final weight of romaine lettuce was 90.16 ± 13.3 g for P4 (hydroponics), 89.4 ± 7.4 g for P2 (aquaponics with 10 romaine lettuce), and 85 ± 11.5 g for P3 (aquaponics with 20 romain lettuce). The highest daily growth (DGR) and relative growth (RGR) were P4 (hydroponics) of 0.056 ± 0.001 cm/day and 0.007 ± 0.002 g/day, respectively. Organic waste from the cultivation of gouramy can be processed with phytoremediation by romaine lettuce. Organic materials such as feed residuals and feces after the process of decomposition can be utilized for romaine lettuce growth. The highest daily growth (GR), specific growth (SGR) and survival rate (SR) of gouramy were P2 (aquaponics with 10 romaine lettuce) at 7.43 ± 1.77g/fish/day, 1.26 ± 0.12%/day, 100%, respectively. However, the best feed conversion ratio (FCR) was P3 (aquaponics with 20 romaine lettuce) of 0.59 ± 0.28.
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