An 8-week feeding trial investigated the effects of common carbohydrate sources, including cornstarch (CS), wheat starch (WS), and wheat flour (WF), on the performance of different gibel carp genotypes: Dongting, CASIII, and CASV. see more Data visualization and unsupervised machine learning were used to analyze the growth and physical response results. Using a self-organizing map (SOM) and clustering growth and biochemical indicators, CASV exhibited superior growth and feed utilization, better regulating postprandial glucose than CASIII. In sharp contrast, Dongting showed poor growth performance and high plasma glucose levels. Gibel carp displayed diverse applications of CS, WS, and WF, yet WF uniquely correlated with improved zootechnical performance. This was measured through increased specific growth rate (SGR), feed efficiency (FE), protein retention efficiency (PRE), and lipid retention efficiency (LRE), as well as enhanced hepatic lipogenesis, augmented liver lipid content, and boosted muscle glycogen levels. see more Analyzing physiological responses using Spearman correlation, a significant negative correlation was found in gibel carp between plasma glucose and growth, feed utilization, glycogen storage, and plasma cholesterol, while a positive correlation was observed between plasma glucose and liver fat. CASIII displayed transcriptional variations, showing amplified expression of pklr, linked to hepatic glycolysis, alongside increased expression of pck and g6p, key players in gluconeogenesis. Puzzlingly, elevated gene expression associated with glycolysis and fatty acid oxidation was observed in muscle from Dongting. There were many interactions between carbohydrate sources and strains, with significant effects on growth, metabolites, and transcriptional control; this substantiates the presence of genetic variations in how gibel carp utilize carbohydrates. Globally, CASV demonstrated relatively better growth and carbohydrate utilization. Gibel carp, in turn, appeared to efficiently utilize the wheat flour.
This study aimed to explore the synergistic impact of Pediococcus acidilactici (PA) and isomaltooligosaccharide (IMO) on the growth and development of young common carp (Cyprinus carpio). Randomly dividing 360 fish (1722019 grams in total) into six groups yielded three replicates of 20 fish per group. see more Over the course of eight weeks, the trial unfolded. A basal diet was given to the control group, while the PA group was fed the basal diet plus 1 g/kg PA (1010 CFU/kg), 5 g/kg IMO (IMO5), 10 g/kg IMO (IMO10), 1 g/kg PA and 5 g/kg IMO (PA-IMO5), and 1 g/kg PA and 10 g/kg IMO (PA-IMO10). The diet containing 1 gram of PA per kilogram and 5 grams of IMO per kilogram significantly improved fish growth performance and decreased the feed conversion ratio (p < 0.005), as the results demonstrated. The PA-IMO5 group exhibited enhancements in blood biochemical parameters, serum lysozyme, complements C3 and C4, mucosal protein, total immunoglobulin levels, lysozyme concentrations, and antioxidant defense mechanisms, with statistical significance (p < 0.005). Consequently, a synergistic blend of 1 gram per kilogram (1010 colony-forming units per kilogram) of probiotic additive PA and 5 grams per kilogram of immunostimulant IMO is advisable as a beneficial synbiotic and immunostimulatory supplement for juvenile common carp.
The performance of Trachinotus ovatus fed a diet containing blend oil (BO1) as the lipid, specifically formulated to fulfill its essential fatty acid requirements, was remarkable as demonstrated in our recent study. Employing three isonitrogenous (45%) and isolipidic (13%) diets (D1-D3), differing only in lipid type (fish oil (FO), BO1, and a blend of 23% fish oil and soybean oil (BO2)), T. ovatus juveniles (average initial weight 765g) were nourished for nine weeks. This allowed for the assessment of the effect and the investigation of the mechanism. Fish fed with D2 experienced a greater rate of weight gain in comparison to fish receiving D3, demonstrating a statistically significant difference (P<0.005). The D2 fish group, in comparison to the D3 group, showed enhanced oxidative stress markers, including lower serum malondialdehyde levels and lower liver inflammatory responses, indicated by decreased expression of genes encoding four interleukins and tumor necrosis factor. The D2 group further exhibited higher hepatic immune-related metabolite levels, such as valine, gamma-aminobutyric acid, pyrrole-2-carboxylic acid, tyramine, l-arginine, p-synephrine, and butyric acid (P < 0.05). In addition, the D2 group exhibited a significantly higher proportion of intestinal probiotic Bacillus, and a significantly lower proportion of pathogenic Mycoplasma compared to the D3 group (P<0.05). The core differential fatty acids of diet D2 closely resembled those of diet D1, but diet D3's linoleic acid and n-6 PUFA content, as well as its DHA/EPA ratio, were superior to those of D1 and D2. The observed enhanced growth, reduced oxidative stress, improved immune responses, and altered intestinal microbial communities in T. ovatus treated with D2, can likely be attributed to the beneficial fatty acid composition of BO1, thereby underscoring the importance of precise fatty acid nutrition.
From edible oil processing, acid oils (AO) emerge as high-energy byproducts, offering an interesting and sustainable perspective for aquaculture feeding. This study investigated the impact of substituting fish oil (FO) in diets with two alternative oils (AO), rather than vegetable oils, on the lipid profile, lipid oxidation, and quality attributes of fresh European sea bass fillets, following six days of refrigerated commercial storage. Five different dietary regimes were implemented for the fish, one with 100% FO fat and the other four with a 25% FO fat supplement paired with crude soybean oil (SO), soybean-sunflower acid oil (SAO), crude olive pomace oil (OPO), or olive pomace acid oil (OPAO). Fresh and refrigerated fish fillets were scrutinized for their fatty acid makeup, tocopherol and tocotrienol constituents, the degree of lipid oxidation (measured by 2-thiobarbituric acid (TBA) value), volatile compounds present, color, and ultimately, consumer palatability. Total T+T3 content remained unaffected by refrigerated storage; however, this method did increase secondary oxidation products (TBA values and volatile compound amounts) in all the fish fillets from each dietary group studied. FO substitution caused a decrease in EPA and DHA, and an increase in T and T3; surprisingly, a 100-gram serving of fish fillets was still enough to meet the recommended daily EPA and DHA intake for people. The SO, SAO, OPO, and OPAO fillets demonstrated enhanced oxidative stability, with OPO and OPAO fillets showcasing the best performance, indicated by a combination of higher oxidative stability and lower TBA values. Despite alterations in diet and cold storage, sensory acceptance remained consistent, while colorimetric discrepancies escaped human visual discrimination. The oxidative stability and acceptability of the flesh of European sea bass fed with SAO and OPAO as a replacement for fish oil (FO) demonstrate these by-products' suitability as an energy source in aquaculture diets, signifying a pathway for upcycling and improving the overall environmental and economic sustainability of the practice.
In adult female aquatic animals, the diet's optimal lipid nutrient supplementation demonstrated significant physiological influence on gonadal development and maturation. Four isonitrogenous and isolipidic diets were developed for Cherax quadricarinatus (7232 358g). These diets featured differing lecithin sources: control, 2% soybean lecithin (SL), egg yolk lecithin (EL), or krill oil (KO). Crayfish ovary development and physiological characteristics were examined after a period of ten weeks, during which they were fed. Analysis of the results revealed a significant increase in the gonadosomatic index following SL, EL, or KO supplementation, particularly within the KO group. Crayfish consuming the SL diet had a notably higher hepatosomatic index than those receiving the other experimental dietary treatments. KO's promotion of triacylglycerol and cholesterol deposition in the ovary and hepatopancreas outperformed SL and EL, however, serum low-density lipoprotein cholesterol levels were found to be the lowest in KO. KO demonstrated a substantial rise in yolk granule deposition and a faster pace of oocyte maturation compared to the other experimental groups. Furthermore, the incorporation of dietary phospholipids led to a notable elevation in gonad-stimulating hormone levels within the ovaries and a corresponding decrease in the secretion of gonad-inhibiting hormones from the eyestalks. KO supplementation yielded a marked increase in the body's organic antioxidant capacity. Dietary phospholipid intake has been shown, through ovarian lipidomic studies, to differentially affect the levels of phosphatidylcholine and phosphatidylethanolamine, two major glycerophospholipids. Regardless of lipid variety, C182n-6, C183n-3, C204n-6, C205n-3, and C226n-3 polyunsaturated fatty acids were instrumental in the ovarian development process of crayfish. Activated steroid hormone biosynthesis, sphingolipid signaling, retinol metabolism, lipolysis, starch and sucrose metabolism, vitamin digestion and absorption, and pancreatic secretion, are the most positive functions of KO, as revealed by the ovarian transcriptome. Subsequently, dietary supplementation with SL, EL, or KO all enhanced the ovarian developmental quality of C. quadricarinatus, particularly KO, which emerged as the optimal selection for ovarian advancement in mature female C. quadricarinatus.
Butylated hydroxytoluene (BHT), a common antioxidant, is incorporated into animal/fish feed to control the detrimental effects of lipid autoxidation and peroxidation reactions. Animal studies have presented evidence of BHT toxicity, however, the toxic effects and buildup from oral intake in aquaculture species are not comprehensively documented.