02488naa a2200361 a 450000100080000000500110000800800410001902200140006002400520007410000210012624501390014726000090028652014050029565000150170065000170171565000220173265000100175465000130176465300170177765300380179465300210183265300350185370000190188870000190190770000180192670000140194470000200195870000170197870000200199570000230201570000250203877300630206321439582024-10-25       2022    bl uuuu     u00u1 u    #d  a0967-61207 ahttps://doi.org/10.1007/s10499-022-00912-92DOI1 aFLORES, R. M. V.  aEfficiency tests for screening production strategies in a lettuce-juvenile tilapia aquaponics system in Brazil.h[electronic resource]  c2022  aThis article assesses strategies for managing the economic returns to an aquaponics production system with joint products of lettuce and tilapia. Experimental data from Brazil that varied fish stocking density and the fish feeding rate are analyzed using nonparametric efficiency testing methods to identify potentially profitable technologies and their sensitivities to prices of inputs and outputs. Plants and fish production are symbiotic in an aquaponics system, with fish waste providing nutrients for plant growth and plants helping maintain water quality for the fish via filtration. The optimal input/output mix among alternatives is identified, and sensitivity analysis is used to assess the price ranges around recent market conditions (0.18 R$/tilapia fingerling, 2.8 R$/kg for fish feed, 20 R$/kg for juvenile fish, and 1.57 R$/kg for lettuce) over which that technology choice remains optimal. The configuration of production controls is robust to price changes. Results show that at low fish stocking densities (100 fish/m3), the effluent in the water provides insufficient nutrients to plants. In addition, early lettuce harvests (before 26 days) are generally less efficient thantreatments that allow more time for plant growth. Sensitivity analysis indicates that the optimality of the identified configuration of production controls is robust with respect toinput and output prices.  aAquaponics  aFish feeding  aNutrição Animal  aPeixe  aTilápia  aFeeding rate  aNonparametric efficiency analysis  aStocking density  aTilapia and lettuce production1 aPRECKEL, P. V.1 aQUAGRAINIE, K.1 aWIDMAR, N. O.1 aSILVA, L.1 aCOSTA, J. I. da1 aPINHO, S. M.1 aPORTELLA, M. C.1 aCASTELO BRANCO, T.1 aPEDROZA FILHO, M. X.  tAquaculture Internationalgv. 30, p. 2403-2424, Oct. 2022.