Hypoxic Responses in Crustacean Physiology
Summary
Crustaceans inhabit environments in which dissolved oxygen levels can fluctuate dramatically, from near-anoxic sediments to oxygenated surface waters. In response to hypoxia, these animals deploy a suite of physiological, biochemical and molecular mechanisms to maintain homeostasis. At the cellular level, oxygen‐sensing pathways trigger stabilisation of hypoxia‐inducible factors (HIFs), leading to transcriptional reprogramming that favours anaerobic ATP production and reduces reliance on mitochondrial oxidative phosphorylation. Metabolic adjustments include enhanced glycolytic flux, upregulation of key enzymes such as lactate dehydrogenase and hexokinase, and shifts in fuel utilisation from protein to mixed protein–lipid substrates. Concomitantly, antioxidant systems are activated to mitigate reactive oxygen species generated during reoxygenation. Organ‐level changes, including altered gill ventilation, circulatory adjustments and membrane‐bound respiratory pigments, further support oxygen delivery. Chronic hypoxia can induce structural remodelling of gill lamellae and hepatopancreatic tissue, reflecting long-term adaptation or potential damage. These responses are critical to survival in variable aquatic habitats and have direct implications for crustacean aquaculture, where seasonal algal blooms, eutrophication and climate-driven deoxygenation threaten production. Understanding hypoxic resilience informs selective breeding for tolerance, optimises culture practices and contributes to conservation strategies for wild populations facing expanding oxygen-minimum zones.
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Hypoxic Responses in Crustacean Physiology publication trend
The graph below shows the total number of articles in hypoxic responses in crustacean physiology across all publications each year (not limited to Nature Index journals).
Technical terms
Hypoxia: A state of low environmental oxygen availability that challenges aerobic metabolism.
Hypoxia-inducible factor (HIF): A transcription factor complex that orchestrates gene expression changes under low oxygen tension.
Oxidative phosphorylation: Mitochondrial process generating ATP via electron transport and oxygen consumption.
Glycolysis: Anaerobic metabolic pathway converting glucose to lactate to yield ATP when oxygen is limited.
Reoxygenation: The restoration of oxygen supply following a hypoxic period, often accompanied by oxidative stress.
Transcriptomics: The large-scale study of RNA transcripts to assess gene expression patterns.
Metabolomics: The comprehensive analysis of small-molecule metabolites reflecting physiological states.
References
- Respiratory Metabolism Responses of Chinese Mitten Crab, Eriocheir sinensis and Chinese Grass Shrimp, Palaemonetes sinensis, Subjected to Environmental Hypoxia Stress. Frontiers in Physiology (2018).
- Transciptomic and histological analysis of hepatopancreas, muscle and gill tissues of oriental river prawn (Macrobrachium nipponense) in response to chronic hypoxia. BMC Genomics (2015).
- Based on the Metabolomic Approach the Energy Metabolism Responses of Oriental River Prawn Macrobrachium nipponense Hepatopancreas to Acute Hypoxia and Reoxygenation. Frontiers in Physiology (2018).
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