Title: Dissolved oxygen concentration affects hybrid striped bass growth Authors
Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: January 8, 2013
Publication Date: February 4, 2013
Citation: Green, B.W., Fuller, S.A., Mcentire, M.E., Beck, B.H., Rawles, S.D. 2013. Dissolved oxygen concentration affects hybrid striped bass growth [abstract]. Mid-Continent Warmwater Fish Culture Workshop 2013, February 4-6, 2013, Paris, Arkansas. p.12. Technical Abstract: Management of dissolved oxygen (DO) concentration in ponds at night during the growing season is important because fish growth and yield are greater in ponds with higher nightly DO concentrations. Three studies were conducted to quantify performance traits and metabolic responses of hybrid striped bass (HSB) (Sunshine bass; Morone chrysops x M. saxatilis) to hypoxia. In tank studies DO concentration was maintained at a constant 30%, 50% or 100% or 25%, 40% or 100% of saturation at ambient water temperature. Fish in the pond study were exposed to diurnally varying DO concentrations that were maintained above 25%, 40%, or 55% of saturation. Fish growth in the tank studies was affected by DO concentration; fish growth increased linearly with increased DO concentration because fish consumed more feed at higher DO concentration. No differences among treatments were detected for HSB performance traits during the pond study likely because of late season compensatory growth by fish in the low DO treatment. Evaluation of aerobic respiration and glycolysis in freshly isolated liver slices showed that oxygen consumption rate did not differ significantly between fish maintained at hypoxia versus normoxia. However, the extracellular acidification rate (a marker of glycolysis) was significantly higher in fish maintained under chronic hypoxic conditions.