Growth, metabolism and respiration in Nile tilapia (Oreochromis niloticus) exposed to chronic or periodic hypoxia.

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
Kwasi Adu ObirikorangPeter Vilhelm Skov

Abstract

Tropical earthen ponds for extensive aquaculture are characterised by daily fluctuations in the availability of dissolved oxygen in the water. Primary production during the daytime ensures excess oxygen availability with oxygen partial pressures (pO2) exceeding 220 mmHg, while nocturnal respiration of fish, plankton and bacteria leads to nightly episodes of severe hypoxia (pO2 < 20 mmHg), often persisting for several hours. To investigate how oxygen availability affects feeding, growth, digestive performance, metabolism and behaviour in Nile tilapia (Oreochromis niloticus), a series of experiments were conducted under different oxygen regimes. To assess growth performance, triplicate groups of fish were held either under constant normoxia (pO2 17.4 ± 0.4 kPa), constant hypoxia (pO2 8.1 ± 0.6 kPa), or diel-cycling between normoxia (pO2 17.1 ± 0.6 kPa from 6 a.m. to 11 p.m.) and severe nocturnal hypoxia (0.4 ± 1.0 kPa from 11 p.m. to 6 a.m.). Chronic hypoxia led to significant affected feed intake and FCR, compared to the normoxic group, whereas nocturnal hypoxia was associated with a compensatory increase in appetite later in the day. Overall, this resulted in a significant increased feed intake compared to the normoxic group. I...Continue Reading

Citations

Apr 16, 2021·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Julie Hansen BergstedtPeter Vilhelm Skov
Jun 25, 2021·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Jing WangWeijie Mu

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