Bioeconomic modeling of optimal harvest time in Nile tilapia (Oreochromis niloticus) considering size heterogeneity and minimum marketable size

Patricia Borrego-Kim, Roger Domínguez-May, Andrea G. Monroy-Borrego, Mariel Gullian-Klanian

Submited: 2020-02-20 00:51:31 | Published: 2020-09-01 15:36:10

DOI: https://doi.org/10.3856/vol48-issue4-fulltext-2526

Abstract


Size dispersion in farmed fish has a substantial impact on production's bioeconomic performance, directly affecting net profits. This work's objective was to develop a bioeconomic model based on experimental data to identify the optimal harvest time (OHT) for Nile tilapia Oreochromis niloticus. The bioeconomic model considered four minimum marketable sizes (Mms = 350, 400, 450, and 500 g). Organisms were selected by size with different coefficients of variation (CV). Therefore, they were reared under two growth strategies: heterogeneous size (HT = 44-155 g; CV 25.5%) and homogeneous size (HM = 87-112 g; CV 5.9%). The HT system-generated tradable biomass of 99.30% in an OHT of 196 days with a net profit of USD 3,551.61 and a Mms of 350 g. However, the HM system achieved greater marketable biomass (99.53%) in less time (OHT = 181 days) with a net profit of USD 3,327.96 for the same Mms. The Mms of 500 g had the lowest net benefit in both systems. The HM strategy earned an additional 10.66% of incomes, indicating that the reduction in size dispersion positively impacted profits. The developed model provides a new perspective regarding the management of heterogeneity and size homogeneity in commercial production of Nile tilapia in intensive systems.


Borrego-Kim P, Domínguez-May R, Monroy-Borrego A, Gullian-Klanian M. Bioeconomic modeling of optimal harvest time in Nile tilapia (Oreochromis niloticus) considering size heterogeneity and minimum marketable size. Lat. Am. J. Aquat. Res.. 2020;48(4): 602-612. Available from: doi:10.3856/vol48-issue4-fulltext-2526 [Accessed 26 Nov. 2020].
Borrego-Kim, P., Domínguez-May, R., Monroy-Borrego, A., & Gullian-Klanian, M. (2020). Bioeconomic modeling of optimal harvest time in Nile tilapia (Oreochromis niloticus) considering size heterogeneity and minimum marketable size. Latin American Journal of Aquatic Research, 48(4), 602-612. doi:http://dx.doi.org/10.3856/vol48-issue4-fulltext-2526