Resumen

GUTIERREZ-LEYVA, R. et al. Evaluation of the intensive production of juvenile tilapia under greenhouse conditions: Profitability analysis and aspects of its applicability. Revista bio ciencias [online]. 2020, vol.7, e584.  Epub 18-Nov-2020. ISSN 2007-3380.  https://doi.org/10.15741/revbio.07.e584.

Fish feed represents between 50 % and 70 % of the production costs of intensive aquaculture. In this context, we present the results of a study carried out to determine the profitability of Nile tilapia production under greenhouse conditions based on the results of a growth bioassay conducted with tilapia under two feeding conditions in which the optimal growth rate was determined according to the quality of the diet. In second instance, the benefit/cost ratio of three feeding strategies with high and low protein diets; 1H:1L (strategy A), 2H:1L (strategy B) and 3H:2L (strategy C) was evaluated to determine annual production costs when producing juveniles of 150 g using 6 continuous production periods of 53.5 days under intensive greenhouse conditions. The growth trial lasted 45 days with Nile tilapia (9.6 g) in which 4 diets were evaluated with P/E levels of 18, 19, 20 and 21 kg/MJ with an apparent satiety feeding model (100 % daily feed intake) and the same diets with a 30 % restriction feeding model (70 % daily feed intake). The results of the experiment indicate that the diet with a P/E ratio of 18 kg/MJ supplied with a 30 % restriction improved feed consumption and the use of protein for growth (p<0.05). The profitability analysis determined that the feeding strategy (3H:2L) obtained the best benefit/cost ratio (1.11) and that this condition, once evaluated for 5 years under scenarios of increases in the cost of feed and in the sale price of the product, allowed obtaining increases in the benefit/cost ratio comparable to the performance of the baseline (initial production condition) in values of 1.2-1.4, however, the net present value under these conditions presents a downward trend. In conclusion, the profitability analysis was positive for the evaluation of the project after five-year period of production in terms of the benefit/cost ratio, besides obtained results varied depending on the quality of the diet and on the conditions of the analyzed productive system. Therefore, the usefulness of this modeling could be feasible to produce juveniles of commercial tilapia lines with an average weight of 150 g.

Palabras llave : Tilapia; growth; protein sparing; profitability analysis; benefit/cost ratio; net present value.

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