AQUAPONIC SYSTEM WITH Macrobrachium rosenbergii (DE MAN, 1984) AND Lactuca sativa L. IN DIFFERENTS RATIO: WATER QUALITY, NITROGEN COMPOSTS AND PERFORMANCE

The aquaponic system is a recirculation aquaculture system  were having an integrated production vegetable without soil with aquatic organism, fish or shrimps.  This system has many great effects because the second culture will use the water, the nitrogen composts and phosphor compost from the first culture like energy supply, controlling the water system intake. Moreover, reuse water inside system and production integrated of two organisms, when analyses in future, have effect over costs, improve profitability of system production. The present study was conducted to determined what ration of prawn x lettuce is better to water quality, nitrogen composts and performance of prawn. The experiment was 40 days used 50 L tanks to prawns with density 2 larvae per liters, had 4 treatments and 3 repeats:  1 - control RAS - Recirculation Aquaculture System; 2 - ratio 2 lettuces to 1 prawn; 3 - ratio 4 lettuces to 1 prawn; and 4 - ratio 8 lettuces to 1 prawn. During the experiment the animals were fed twice a day with a specific commercial feed (PB 45%), the feeds were made by haul and the amount of feed offered was calculated as 15% of the biomass of each tank and readjusted for each biometry.