Journal
FISH PHYSIOLOGY AND BIOCHEMISTRY
Volume 42, Issue 3, Pages 955-966Publisher
SPRINGER
DOI: 10.1007/s10695-015-0188-9
Keywords
Growth performance; Antioxidative stress biomarkers; Biochemical biomarkers; Temperature; Bluegill
Categories
Funding
- National Institute of Food and Agriculture (NIFA), US Department of Agriculture [2010-38879-20946]
- Cultural Affairs and Missions sector, Ministry of Higher Education and Scientific Research, Egypt
- NIFA [580650, 2010-38879-20946] Funding Source: Federal RePORTER
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This study was designed to assess the potential effects of Astragalus membranaceus (AM) on the growth performance and antioxidative stress response in bluegill sunfish (Lepomis macrochirus) exposed to challenging cold water temperature conditions. In this regard, fish with an average weight of 43 +/- A 1 g were divided into four groups and fed daily with an AM-free diet (control), and 1.5, 3, and 4.5 % (w/w) AM-incorporated diets for an 8-week period. Oxidative stress response, biochemical, and growth parameters were measured, and subgroups of fish were exposed to the outside challenging cold pond water temperature (1.6-9.9 A degrees C) with an average of 7.0 +/- A 0.1 A degrees C beyond the optimal temperature. The results showed that incorporating AM in the diet significantly improved growth performance parameters (body mass gain, specific growth rate, length, condition factor, and feed conversion ratio) and biochemicals (aspartate aminotransferase and alanine transaminase activities, and glucose and cortisol concentrations). In addition, markedly up-regulated superoxide dismutase, glutathione peroxidase, and catalase activities were observed in AM-treated fish groups over the control. Conclusively, feeding AM diets significantly increased (P < 0.05) growth performance and antioxidative stress profiles throughout the entire experiment, and this increase was much more pronounced at 8 weeks after the water temperature began to rise, which can be related to the nature of Bluegill fish as it is known to be a warm water fish. These findings are considered to be of great importance for sustainable aquaculture.
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