Fish Transport Stress and Physiological Responses
Summary
Transport stress represents a complex assemblage of physical and environmental challenges encountered during handling, packing, confinement and movement of live fish. Stressors include abrupt changes in water quality (temperature, dissolved oxygen, pH, ammonia), mechanical agitation, high stocking densities and intermittent air exposure. Primary responses are mediated by activation of the hypothalamic–pituitary–interrenal axis, resulting in elevated cortisol, hyperglycaemia and shifts in osmoregulatory balance. Secondary effects manifest as alterations in blood biochemistry (lipids, proteins, metabolites), induction of antioxidant enzymes (superoxide dismutase, catalase, glutathione peroxidase), upregulation of heat shock proteins and activation of inflammatory pathways. Tertiary outcomes encompass growth retardation, immunosuppression, tissue damage and modifications of gut microbial communities. Recovery dynamics involve gradual restoration of homeostasis but may reveal persistent physiological or microbiome disruptions. Understanding these responses underpins the development of mitigation strategies—such as water-borne additives, dietary supplements, optimised densities and structured recovery protocols—to enhance welfare and survival in global aquaculture and live-fish trade.
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Fish Transport Stress and Physiological Responses publication trend
The graph below shows the total number of articles in fish transport stress and physiological responses across all publications each year (not limited to Nature Index journals).
Technical terms
Cortisol: Principal glucocorticoid hormone released during stress that regulates energy metabolism and immune function.
Heat shock proteins (HSPs): Molecular chaperones upregulated under stress to stabilise and refold denatured proteins.
Oxidative stress: Condition in which generation of reactive oxygen species exceeds the capacity of antioxidant defences, causing cellular damage.
Superoxide dismutase (SOD): Ubiquitous enzyme that catalyses the conversion of superoxide radicals into hydrogen peroxide, a key antioxidant defence.
Glucocorticoid receptor (GR): Intracellular receptor that binds cortisol and modulates transcription of stress-responsive genes.
Gut microbiome: Community of intestinal microorganisms influencing nutrient absorption, immunity and resilience to stress.
References
- Transport Stress Induces Oxidative Stress and Immune Response in Juvenile Largemouth Bass (Micropterus salmoides): Analysis of Oxidative and Immunological Parameters and the Gut Microbiome. Antioxidants (2023).
- Effects of β-1,3-glucan and ascorbic acid on the nutritional-immune response and antioxidant signaling pathways of live tiger grouper during simulated transport. Aquaculture and Fisheries (2024).
- Transport Stress Changes Blood Biochemistry, Antioxidant Defense System, and Hepatic HSPs mRNA Expressions of Channel Catfish Ictalurus punctatus. Frontiers in Physiology (2018).
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