Aurantiochytriumsp. meal as DHA source in Nile tilapia diet, part I: Growth performance and body composition

Abstract

This study evaluated the inclusion of Aurantiochytrium sp. (ALL-G-RICH ™ ), a source of docosahexaenoic acid (22:6 n-3, DHA), in the diet of Nile tilapia and its effect on growth performance indexes and body composition. Fish (initial mean weight 8.35 ± 0.80 g) were fed different dietary inclusion levels of ALL-G-RICH ™ : 0.00, 0.05, 0.10, 0.20, and 0.40 g/kg and a control diet using cod liver oil (CLO), to provide DHA content comparable to the inclusion of 0.10 g/kg ALL-G-RICH ™ . Although there was no significant effect (p > 0.05) on weight gain, specific growth rate, feed conversion, protein retention rate, and proximal body composition, the inclusion of ALL-G-RICH ™ in the Nile tilapia diet influenced positively the fatty acid profile in the body, resulting in a high DHA concentration. CLO-fed fish accumulated significantly more DHA compared to those fed 0.10 g/kg ALL-G-RICH ™ (p < 0.05). A digestibility trial was also performed for ALL-G-RICH with 65.86 g mean-initialweight fish. The digestibility was high for DHA (96.10%); however, it was low for palmitic acid (70.81%). The results show that the inclusion of up to 0.40 g/kg ALL-G-RICH ™ can be used in Nile tilapia diets without impairing growth performance.

Interaction of feeding frequency and feeding rate on growth, nutrient utilization, and plasma metabolites of juvenile genetically improved farmed Nile tilapia, Oreochromis niloticus

“…The average specific growth rate of fish fed twice a day to AS was close to that reported in Nile tilapia of similar weight, FRs and frequencies, water temperature, and diet composition (control treatment) (Fernandes, Brignol, Filler, Pettigrew, & Fracalossi, 2018). Additionally, several fish species, regardless of feeding habit, have been reported to have high specific growth rates when fed at high FRs (Eroldoǧan, Kumlu, & Aktas, 2004; Ng, Lu, Hashim, & Ali, 2000; Robinson & Li, 1999; Silva, Gomes, & Brandão, 2007; Sun, Chen, & Huang, 2006).…”

Effects of complete replacement of fish oil with plant oil mixtures and algal meal on growth performance and fatty acid composition in juvenile yellowtail Seriola quinqueradiata

“…Table 7 Differences between diet and whole-body/liver fatty acid concentrations in juvenile yellowtail Seriola quinqueradiata fed the experimental diet for 8 weeks Differences between diet and whole-body/liver fatty acid = fatty acid in whole body/liver (g/100 g) − fatty acid in diet (g/100 g in Atlantic salmon (Kousoulaki et al 2015) and Nile tilapia (Fernandes et al 2018), but decreased in juvenile tilapia (Sarker et al 2016) and juvenile olive flounder (Qiao et al 2014). Thus, AM may have a negative effect on feed intake in some species of juvenile fish.…”

Aurantiochytrium sp. Meal Improved Body Fatty Acid Profile and Morphophysiology in Nile Tilapia Reared at Low Temperature

“…is a heterotrophic microorganism found in marine habitats, belonging to the family Thraustochytridae, which can be considered as a possible novel substitute for fish oil because it is rich in DHA. Our team evaluated the inclusion of such a novel feed additive in diets of Nile tilapia at an optimal temperature (28 • C) [22,23] and at a suboptimal temperature (22 • C) [15]. Our findings show that for Nile tilapia kept at cold, suboptimal temperature, dietary supplementation with 10 g kg −1 Aurantiochytrium sp.…”