Effect of the addition of diatoms (Naviculaspp.) and rotifers (Brachionus plicatilis) on water quality and growth of theLitopenaeus vannameipostlarvae reared in a biofloc system

Abstract

Effect of the addition of diatoms (Navicula spp.) and rotifers (Brachionus plicatilis) on water quality and growth of the Litopenaeus vannamei postlarvae reared in a biofloc system Abstract The aim of this study was to evaluate the effect of the addition of Navicula spp. and Brachionus plicatilis on water quality and growth of postlarvae shrimp Litopenaeus vannamei reared in a biofloc system. Four treatments were considered: a control (biofloc system -BFT); BFT with the addition of Navicula spp. (BFT-N); BFT with the addition of Brachionus plicatilis (BFT-B) and BFT with the addition of Navicula spp. and Brachionus plicatilis (BFT-NB), each in triplicate. Shrimp (16.2 AE 0.03 mg) were stocked at a density of 2500 shrimp m À3 and plankton were added on days 1, 5, 10, 15, 20, 25 and 30 at a density of 5 9 10 4 cells mL À1 (Navicula spp.) and 30 organisms L À1 (Brachionus plicatilis). The shrimp were fed a formulated feed in four daily rations composed of 40% crude protein and 8% lipids. Significant differences between treatments were observed for final weight, yield, feed conversion ratio, specific growth rate, protein efficiency ratio and protein content of the shrimp. The combined plankton addition of Navicula spp. and B. plicatilis had better performance parameters, indicating their benefit as natural food sources for postlarvae L. vannamei in biofloc systems.

Effects of addition ofNaviculasp. (diatom) in different densities to postlarvae of shrimpLitopenaeus vannameireared in a BFT system: Growth, survival, productivity and fatty acid profile

“…Regarding the SGR, the BFT 5N and BFT 10N treatments differed significantly from the other treatments. The results were similar to those observed with the addition of microalage in bioflocs by Marinho et al (2014), who found a rate of 14.87 ± 0.61%/ day, and higher than that attained by Brito et al (2016), who found a rate of 9.41 ± 0.41%/day. For FCR and survival, no significant differences were observed between treatments, indicating that the density of Navicula sp.…”

“…The results were similar to those observed with the addition of microalage in bioflocs byMarinho et al (2014), who found a rate of 14.87 ± 0.61%/ day, and higher than that attained byBrito et al (2016), who found a rate of 9.41 ± 0.41%/day. Significant differences according to the t test.centration of 5 × 10 4 cells/ml in an L. vannamei culture in a biofloc system for 35 days.…”

Short‐term effect of the inoculation of probiotics in mature bioflocs: Water quality parameters and abundance of heterotrophic and ammonia‐oxidizing bacteria

“…The levels of TAN (0.4–0.7 mg/L) and NO 2 ‐N (1.4–2.8 mg/L) obtained in this study were similar to those reported by other authors (Audelo‐Naranjo, Martínez‐Córdova, & Voltolina, ; Brito et al, ; Burford et al, ; Xu, Pan, Zhao, & Huang, ) and suitable for growing whiteleg shrimp in biofloc systems.…”

Effect of adding vegetable substrates on Penaeus vannamei pre grown in biofloc system on shrimp performance, water quality and biofloc composition

“…The lipid content of the biofloc was low in all treatments, ranging from 0.4 to 0.5%. Diverse studies have shown that lipid content may vary widely in the bioflocs, depending on many factors such as carbon source (Brito et al, 2016) and the type of microbes associated (Martínez-Córdova et al, 2015). Herein, the lipid contents in heterotrophic bacterial-based bioflocs are usually low Long et al, 2015), while these levels are higher in the photo-autotrophic biofloc (Becerra-Dorame et al, 2012), mainly because of the contribution of diverse microalgae including diatoms, which additionally supply PUFA's and HUFA's (Martins et al, 2016).…”