Abstract
Studies about integrated farming of shrimp with vegetables are scarce, although productivity may be increased when supplemented with nutrients. Therefore, this study evaluated the effects of decreasing concentration of commercial hydroponic solution (treatments 0%, 20%, 46% and 100%) on water quality (nitrogen compounds, phosphate, conductivity, pH and dissolved oxygen), for Amazon river prawn, Macrobrachium amazonicum, and lettuce, Lactuca sativa, seedling development during 18 days. The hydroponic solution significantly increased the total ammonia and nitrate in rearing tanks, up to 60.4 ± 10.3 mg L−1 and 394 ± 53.7 mg L−1 (mean ± SEM) respectively at 100%. These toxic nitrogen levels and other components (trace elements) probably present in the solution decreased Amazon river prawn growth and survival by half when supplemented with 46% and 100%, respectively. Independently of the treatment in the first 14 days after sown, no significant change was observed in lettuce growth, however 18 days after sown with a 100% solution an increased number of leaves, height, fresh mass and plant length were observed. These results indicate that M. amazonicum waste may provide nutritional requirements for lettuce up to 14 days after sown, and afterward a nutrient should be added. We recommend supplementing water with a 20%-hydroponic solution to not affect development of the Amazon river prawn and to increase lettuce seedling growth.
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