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Abstract: This study aimed to investigate the effect of dietary ferulic acid (FA) supplementation on growth performance, antioxidant capacity and some physical characteristics of flesh in genetic improvement of farmed tilapia (GIFT) juveniles. Five diets supplemented with 0, 50, 100, 200 and 400 mg/kg FA were prepared. Weight gain was significantly increased, while feed conversion ratio, viscerosomatic index and hepatosomatic index were significantly decreased in fish fed FA diet at 100 mg/kg feed (p < .05). FA supplementation improved hepatic and serum superoxide dismutase and catalase activities, but decreased the malondialdehyde content (p < .05). Furthermore, with the addition of FA, serum triacylglycerol, cholesterol, low‐density lipoprotein cholesterol contents, alanine aminotransferase and aspartate transaminase activities were reduced, whereas serum high‐density lipoprotein cholesterol content, alkaline phosphatase and lysozyme activities were enhanced. The texture profile analysis parameters and water‐holding capacity tended to increase while cooking loss was decreased by dietary FA supplementation (p < .05). These results suggested that dietary FA supplementation increased the growth performance and antioxidant capacity of GIFT, and improved some physical characteristics of flesh and serum biochemical parameters. The optimum dietary FA level was 100 mg/kg in diet. [ABSTRACT FROM AUTHOR]

The study investigated the effects of dietary conjugated linoleic acid ( CLA) on the growth, lipid metabolism, and plasma lipid levels of juvenile Amur sturgeon Acipenser schrenckii. In the study design, fish were initially fed a carbohydrate-enriched diet to obtain 'high-lipid or obese' fish plus a control ( NC). In the second step, the high-lipid fish were divided into four groups and fed increasing levels of CLA at 0% ( MC0), 0.5% ( MC0.5), 1.0% ( MC1.0), and 2.0% ( MC2.0) in their diet. The initial control fish ( NC) and the other four groups ( MC0-2.0) were set up as an experimental series. Each group had three replicate tanks and 15 fish in each tank. After 6 weeks of feeding, specific growth rates and the condition factor were significantly reduced in the 1.0 and 2.0% CLA-supplemented groups compared with the initial control ( NC) and MC0 group. Body lipid content in the 2.0% CLA group was also significantly lower than in the control and other experimental groups. Compared with the MC0 group, lipid liver content in the 2.0% CLA-supplemented group decreased significantly. Total serum cholesterol was significantly lower in the 1.0% and 2.0% CLA-supplemented groups. Serum high-density lipoprotein cholesterol was significantly lower in the 2.0% CLA group than in the MC0 group. There were no differences in survival rate, feed conversion efficiency, body moisture, body protein content, hepatosomatic index, serum triglyceride, or low-density lipoprotein cholesterol among all experimental groups. The results suggest that adding CLA to fish diets is advisable as it can reduce growth and lipid accumulation in both the body and liver, and affect the regulation of blood lipid levels in juvenile Amur sturgeon. [ABSTRACT FROM AUTHOR]

The present study was conducted to compare growth performance, feed utilization, muscle composition, and postprandial glycemic and glycogen responses of juvenile Amur sturgeon, Acipenser schrenckii, fed different carbohydrate diets in order to select the most appropriate carbohydrate sources for this species. Six experimental diets were formulated containing 22% glucose, fructose, maltose, dextrin, α-starch or cornstarch, respectively. Triplicate groups of 20 fish (average weight: (4.7 ± 0.1) g, means ± SD) were randomly fed one of the six diets for eight weeks. Results showed that the weight gain rate was highest in fish fed the dextrin (716.0%) or α-starch diet (782.9%), and lowest in fish fed the fructose diet (333.2%). Specific growth rate and feed efficiency showed a similar weight gain rate pattern. Apparent digestibility of dietary carbohydrate for Amur sturgeon was the fructose, glucose> maltose> dextrin> α-starch > cornstarch diet; apparent digestibility of dietary protein was the fructose> glucose, maltose, dextrin> cornstarch> α-starch diet. Contents of muscle moisture, ash and crude lipid were significantly affected by the difference in dietary carbohydrate sources (P < 0.05), but no significant difference was observed in crude protein content (P > 0.05). Dietary carbohydrate sources significantly affected plasma glucose and liver glycogen concentrations in sturgeon in different periods after feeding (P < 0.05). According to the weight gain rate, dextrin and α-starch were the most appropriate carbohydrate sources for juvenile Amur sturgeon, whereas fructose was deemed to be an inadequate carbohydrate source. [ABSTRACT FROM AUTHOR]

The article presents a study on the effects of dietary dextrin feed utilization, growth and body composition of juvenile Chinese sturgeon or Acipenser sinensis. The study involves iso-protein and iso-lipid diets containing concentrations of dextrin as well as casein and gelatin used as protein source. Results showed improved growth and feed utilization by an increase in dietary dextrin. Assessments found no differences in muscle moisture, muscle crude protein or liver moisture.

The study investigated the effects of different dietary lipid sources on the growth performance, carcass composition, and blood parameters of juvenile Chinese sturgeon, Acipenser sinensis. Seven iso-nitrogenous and iso-energetic diets containing different lipid sources were prepared, i.e. fish oil ( FO), soybean oil ( SO), groundnut oil ( GO), rapeseed oil ( RO), corn oil ( CO), pork lard ( PL), or fish oil: pork lard (1 : 1, FPL). Each experimental diet was fed to triplicate treatments of eight Chinese sturgeon juveniles with initial weights of approximately 47.5 g in indoor tanks for 10 weeks. The FO, SO, and CO treatments had significantly higher weight gain and specific growth rates than the other treatments. Muscle lipid content of the FO treatment was significantly higher than that of the PL treatment, but significantly lower than that of the SO treatment (P < 0.05). The PL treatment had the lowest liver lipid content. Plasma cholesterol and triglyceride concentrations in the CO, FO, and SO treatments were significantly lower than those in the GO, PL, and FPL treatments. The activities of alanine aminotransferase and aspartate transaminase in the FO, GO, and CO treatments were lower than those in the SO, PL and FPL treatments (P < 0.05). This study revealed that the use of lipid sources for juvenile A. sinensis can be chosen in the order of FO, followed by CO and SO; GO was the least suitable lipid source for juvenile Chinese sturgeons. [ABSTRACT FROM AUTHOR]