Nile tilapia fingerling cultivated in a low-salinity biofloc system at different stocking densities

  • Priscilla C. M. Lima Universidade Federal Rural de Pernambuco (UFRPE), Dept. Pesca e Aquicultura (DEPAq), Rua Dom Manuel de Medeiros, Dois Irmãos, 52171-900, Recife, PE
  • Jéssika L. Abreu Universidade Federal Rural de Pernambuco (UFRPE), Dept. Pesca e Aquicultura (DEPAq), Rua Dom Manuel de Medeiros, Dois Irmãos, 52171-900, Recife, PE
  • Allyne E. M. Silva Universidade Federal Rural de Pernambuco (UFRPE), Dept. Pesca e Aquicultura (DEPAq), Rua Dom Manuel de Medeiros, Dois Irmãos, 52171-900, Recife, PE
  • William Severi Universidade Federal Rural de Pernambuco (UFRPE), Dept. Pesca e Aquicultura (DEPAq), Rua Dom Manuel de Medeiros, Dois Irmãos, 52171-900, Recife, PE
  • Alfredo O. Galvez Universidade Federal Rural de Pernambuco (UFRPE), Dept. Pesca e Aquicultura (DEPAq), Rua Dom Manuel de Medeiros, Dois Irmãos, 52171-900, Recife, PE
  • Luis O. Brito Universidade Federal Rural de Pernambuco (UFRPE), Dept. Pesca e Aquicultura (DEPAq), Rua Dom Manuel de Medeiros, Dois Irmãos, 52171-900, Recife, PE http://orcid.org/0000-0002-6971-3020
Keywords: aquaculture, growth, water quality, BFT, fish

Abstract

A 42-day trial was conducted to evaluate the effects of a low-salinity biofloc system with different stocking densities on water quality and zootechnical performance of Nile tilapia fingerlings (10 g/L). Four treatments were tested at different densities: 500 fish/m³, 750 fish/m³, 1,000 fish/m³ and 1,250 fish/m³, all in triplicate. Fingerlings of Oreochromis niloticus (initial mean weight of 1.17 ± 0.05 g) were stocked in twelve experimental black-plastic tanks (40 L) with no water exchange during the experimental period. Molasses was added daily to the system at 30% of the amount of feed, and fish were given four daily rations of a formulated feed composed of 36% crude protein and 9% lipids. Water quality variables (dissolved oxygen, pH, salinity, TAN, NO2, NO3 and PO43) did not demonstrate significant differences between the treatments. However, significant influences (α ≤ 0.05) of the stocking densities were observed for total suspended solids, settleable solids, final weight, yield, and protein efficiency ratio. The results showed survival over 96%, final weight values between 12 and 18 g, yield between 9.49 and 15.27 kg/m3, water consumption of 52 to 101 L/kg fish, and total time of settling chambers between 238 and 305 h/kg fish. These results indicate a negative effect of stocking density on final weight, survival, alkalinity, NO2, PO43 and water consumption, and a positive effect on yield in Nile tilapia fingerling culture (1-20 g) in a low-salinity biofloc system with densities up to 1000 fish/m³.

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Published
2019-01-08
How to Cite
Lima, P. C. M., Abreu, J. L., Silva, A. E. M., Severi, W., Galvez, A. O., & Brito, L. O. (2019). Nile tilapia fingerling cultivated in a low-salinity biofloc system at different stocking densities. Spanish Journal of Agricultural Research, 16(4), e0612. https://doi.org/10.5424/sjar/2018164-13222
Section
Animal production