Effect of dietary supplementation with filamentous microalga Tribonema ultriculosum on growth performance, fillet quality and immunity of rainbow trout Oncorhynchus mykiss

Abstract

The present study was to investigate the effect of dietary Tribonema ultriculosum supplementation on growth performance, fillet nutritional quality and immunity of rainbow trout Oncorhynchus mykiss (165.26 ± 0.57 g, mean ± SD). Three diets containing 0 (control), 50 g/kg and 100 g/kg T. ultriculosum (TU) were introduced to triplicate groups of the experimental fish for 90 days. Then, a lipopolysaccharide (LPS) stress experiment was conducted to evaluate the effect of microalgal addition on fish immune response. Compared to the control, microalgal addition significantly increased fish feed intake and growth. Dietary T. ultriculosum supplementation significantly increased the contents of palmitoleic acid, eicosapentaenoic acid (EPA) and docosahexaenoic acid in fillet. The addition of T. ultriculosum significantly increased the activity levels of spleen glutathione peroxidase (before LPS stress) and superoxide dismutase (after LPS stress), and simultaneously decreased the spleen malondialdehyde content compared to the control. In terms of the immune response, fish fed diets containing T. ultriculosum had a higher level of lysozyme activity (before LPS stress), immunoglobulin M content (before and after LPS stress) and hepcidin expression (after LPS stress) compared to the control. These results suggest that T. ultriculosum can be used to increase fish growth, fillet nutritional quality and immunity.

Phylogeny and lipid profiles of snow-algae isolated from Norwegian red-snow microbiomes

“…The latter FA is not generally abundant in the Chlorophyta and has been detected only at low concentrations in red, orange, and green snow algal blooms in the field (Spijkerman et al 2012 , Davey et al 2019 ). X. bristolianum was also characterized by multiple omega-4 fatty acids, including C16:2n-4 and C16:3n-4 which have previously been reported within the kingdom Chromista including the related species Tribonema ultriculosum (Chen et al 2021 ), diatoms including Phaeodactylum tricornutum and Chaetoceros (Bacillariophyta) (Miller et al 2014 , Qiao et al 2016 ), and Isochrysis aff. galbana (Haptophyta) (Huerlimann et al 2014 ).…”

Role of Dietary Microalgae on Fish Health and Fillet Quality: Recent Insights and Future Prospects

“…In recent years, various studies have been carried out to replace fish meal with diverse sources, like plant-derived protein sources and microalgae [13,[63][64][65][66]. Microalgae contain many biological compounds such as n-3 LC-PUFA, polysaccharides, and carotenoids [67]. DHA and EPA have significant effects on human health by reducing cardiovascular diseases and mitigating inflammatory diseases [67].…”

“…Microalgae contain many biological compounds such as n-3 LC-PUFA, polysaccharides, and carotenoids [67]. DHA and EPA have significant effects on human health by reducing cardiovascular diseases and mitigating inflammatory diseases [67]. A fish fillet (a dark muscle), rib meat (a light muscle), mesenteric fat, and liver are a few of the tissues where lipids are stored.…”

“…Authors indicated that Schizochytrium sp. and fish oil can boost n-3 fatty acids in tilapia fillets over a period of four weeks, which is of high nutritional benefit to consumers [67]. Five isonitrogenous and isolipidic feed diets were prepared by replacing fish oil with Isochrysis galbana in pompano (Trachinotus ovatus).…”