Physicochemical characteristics of lyophilized biofloc produced in whiteleg shrimp cultures with different fishmeal inclusion into the diets

Anselmo Miranda Baeza


DOI: https://doi.org/10.3856/vol44-issue4-fulltext-12

Abstract


The aim of this study was to determine the physicochemical characteristics of lyophilized biofloc produced in the culture of whiteleg shrimp fed diets with different fishmeal inclusion. Treatments consisted of four diets with fishmeal contents of 0 g Kg-1 (T0) 100 g Kg-1 (T100), 200 g Kg-1 (T200), 300 g Kg-1 (T300), and a commercial diet with 300 g Kg-1 (TC) as a control. The shrimp was cultures in low salinity (5 g L-1) at density of 600 ind m-3. The bioflocs were manually collected at day 28, lyophilized, and processed. Proximal composition was determined. To analyze morphology and particle size, photomicrographs were obtained using a Scanning Electron Microscope (SEM). Molecular weights of the protein hydrolysates were determined, and finally the bioflocs protein surface hydrophobicity (S0) was measured. No significant differences were detected for protein (360-404 g Kg-1), lipid (6-8 g Kg-1) and fiber (5-9 g Kg-1) contents. ash (205-284 g Kg-1). The ashes (205-284 g Kg-1) were different. The protein molecular weights, not showed differences in the banding pattern. The bioflocs microstructure examined by SEM showed no significant difference between the treatments. The 50% of lyophilized particles had sizes from 3 to 15 μm.

The fluorescence spectra slopes indicate the differences in protein surface hydrophobicity (S0) between the treatments. In general, the physicochemical characteristics were independent of the diet used to produce the bioflocs. The lyophilized biofloc has properties that allow its use as a protein source or raw material for biotechnological processes.


Miranda Baeza A. Physicochemical characteristics of lyophilized biofloc produced in whiteleg shrimp cultures with different fishmeal inclusion into the diets. Lat. Am. J. Aquat. Res.. 2017;44(4). Available from: doi:10.3856/vol44-issue4-fulltext-12 [Accessed 20 Jan. 2019].
Miranda Baeza, A. (2017). Physicochemical characteristics of lyophilized biofloc produced in whiteleg shrimp cultures with different fishmeal inclusion into the diets. Latin American Journal of Aquatic Research, 44(4). doi:http://dx.doi.org/10.3856/vol44-issue4-fulltext-12