Compensatory growth, plasma hormones and metabolites in juvenile Siberian sturgeon ( Acipenser baerii , Brandt 1869) subjected to fasting and re‐feeding

Abstract

A 7‐week study was conducted to investigate the effect of different fasting and re‐feeding regimes on compensatory growth and some physiological parameters of juvenile Siberian sturgeon (Acipenser baerii). Fish (46.5 ± 0.5 g) were fed on a diet (containing 450 g/kg crude protein and 20 MJ/kg digestible energy) according to four feeding regimes in triplicate including: control group (C, fed everyday), W1 (2 weeks of feeding followed by 1 week of fasting and 4 weeks of re‐feeding), W2 (1 week of feeding followed by 2 weeks of fasting and 4 weeks of re‐feeding) and W3 (3 weeks of fasting followed by 4 weeks of re‐feeding). The fasted groups including W1 (119.6 ± 2.1 g), W2 (118.0 ± 1.7 g) and W3 (108.5 ± 4.8) significantly lost their weights during fasting phase and did not attain the final weight of the C (137.3 ± 1.7 g) after re‐feeding phase. The re‐feeding phase increased the specific growth rate in the fasted groups compared to the C (p < .05). After the fasting phase, concentrations of T3, T4, glucose, total protein and triglyceride in plasma of fasted groups were decreased, but levels of total cholesterol, aspartate aminotransferase, alkaline phosphatase and lactate dehydrogenase increased compared to the C. After re‐feeding phase, except for glucose level, all mentioned metabolites were restored in the plasma of W1 group, but total protein level and aspartate aminotransferase concentrations in plasma were not restored in W2 and W3 groups. Overall, our finding demonstrated 4 weeks of re‐feeding was too short to induce full compensatory growth in A. baerii juveniles.

Effects of a single-phase fasting period and subsequent re-feeding on compensatory growth, digestive enzyme activities, and antioxidant capacity of sobaity (Sparidentex hasta) and yellowfin seabream (Acanthopagrus latus)

“…Furthermore, starvation of L. rohita for a week pronouncedly elevated serum ALT and AST in the gills and the liver, but their levels significantly decreased after a week of RF. Ashouri et al (2020) demonstrated that levels of AST, ALP, and LDH in plasma juvenile Siberian sturgeon (Acipenser baerii) were subjected to one, two, and three weeks of FA were increased, but their values restored to normal ranges after four weeks of RF. The activity of ALT in the liver of A. latus in T2 increased, suggesting elevation amino acids mobilization for providing energy.…”

Physiological responses of Siberian sturgeon (Acipenser baerii) juveniles fed on full-fat insect-based diet in an aquaponic system

“…Restocking programs are also of great interest for this species since it is included in the list of endangered wild populations 1 . Compared to other sturgeon species, Acipenser baerii shows rapid growth rate, resistance to pathogens, a relatively short reproductive cycle (7–8 years) and can be reared using a wide range of diets and environmental conditions 2 , 3 . Owing to its features and high commercial value, intensive aquaculture of Siberian sturgeon is presently carried out in different parts of the world and, in recent years, several studies regarding farming-related biology 4 and nutritional requirements 1 , 5 have been performed.…”

Metabolism and growth performance of pacu (Piaractus mesopotamicus) juveniles submitted to different feeding frequencies

“…Plasmatic glucose levels is a routine index to determine nutritional status (Pottinger et al, 2003) and nutritional stress (Furné et al, 2012;Pérez-Jiménez et al, 2012). It is noteworthy that the maintenance of this metabolite during fasting has been reported for other fish species (Ashouri et al, 2019;Bermejo-Poza et al, 2019;Mozanzadeh et al, 2015;Yarmohammadi et al, 2012), which reveals the capacity and plasticity of some fish species in the face of short-term fasting. In general, serum glucose are maintained by glycogenolysis (the break of glycogen in the liver by gluconeogenesis), generating glucose from lactate, amino acids and glycerol (Favero et al, 2019;Ashouri et al, 2019).…”

“…Several studies demonstrated that teleost fish are capable of tolerating periods of unfavorable feeding conditions by activating behavioral changes and biochemical, physiological and structural adaptive responses (Ashouri et al, 2019;Mozanzadeh et al, 2015). Fish have the ability of reducing their energy costs in fasting periods and reusing proteins (Salem et al, 2007).…”

“…As transamination enzymes did not display significant differences, it could be inferred that no protein catabolism occurred. Studies of severe restrictions reported increased activity of these enzymes, suggesting higher gluconeogenesis from substrates such as amino acids and lactate during fasting periods (Favero et al, 2019;Ashouri et al, 2019), with prominent nutritional stress states (Furné et al, 2012;Pérez-Jiménez et al, 2012). However, when fish were fed once again, serum levels returned to normal.…”