Biosensor Applications for Fish Stress Monitoring

Fish experience a range of physiological stressors in aquaculture and transport, from temperature fluctuations to handling and water quality changes. Traditional assessments rely on sporadic sampling of blood or tissue, which can itself induce stress and delay intervention. Biosensors offer real-time, continuous monitoring of biochemical and biophysical markers—such as cortisol, blood glucose and lactic acid—through minimally invasive or non-invasive interfaces. Advances in enzyme-based electrochemical sensors, optical detection and physical sensing modalities have enabled rapid readings directly from mucus, interstitial fluids or whole-body impedance. Coupled with wireless data transmission and embedded analytics, these systems facilitate early warning of adverse conditions, optimise husbandry practices and reduce mortality. The global significance of such tools spans sustainable aquaculture, live-fish logistics and welfare certification, underscoring the need for robust, versatile and cost-effective platforms that can operate across diverse species and environments.

Research from Nature Portfolio

Recent studies have demonstrated that augmenting aquaculture water with targeted antioxidants can attenuate stress responses under abrupt cooling. In trials with crucian carp, vitamin E supplementation preserved gill tissue integrity and moderated shifts in key metabolic enzymes and energy substrates during temperature descent. Fish treated with vitamin E exhibited lower elevations of stress-related metabolites—such as triglycerides, urea nitrogen and fatty acid synthase—while maintaining higher blood glucose and glycogen levels compared with controls. Histological analysis revealed reduced gill capillary dilation and cellular damage, indicating a protective effect against cold-induced stress. This approach highlights the potential for combining biosensor-based monitoring of metabolic indicators with environmental or dietary interventions to enhance resilience in farmed fish.

Biosensor Applications for Fish Stress Monitoring publication trend

The graph below shows the total number of articles in biosensor applications for fish stress monitoring across all publications each year (not limited to Nature Index journals).

Technical terms

Biosensor: A device combining a biological recognition element with a transducer to detect and quantify analytes.

Cortisol: A steroid hormone released in fish under stress, commonly measured as an indicator of physiological disturbance.

L-lactic acid: A metabolite accumulated during anaerobic respiration, used as a marker of metabolic stress in fish.

Bioelectrical impedance analysis: A technique measuring electrical resistance of tissues to infer body composition or physiological state.

Multi-sensor fusion: The integration of data from multiple sensing modalities to improve accuracy and reliability of measurements.

Deep learning: A subset of machine learning employing layered neural networks to extract features and patterns from complex datasets.

References

1. Biosensors for the assessment of fish health: a review. Fisheries Science (2019).
2. Stress fusion evaluation modeling and verification based on non-invasive blood glucose biosensors for live fish waterless transportation. Frontiers in Sustainable Food Systems (2023).
3. Millimeter Wave-Based Non-Destructive Biosensor System for Live Fish Monitoring. Biosensors (2022).
4. Wireless Biosensor System for Real-Time l-Lactic Acid Monitoring in Fish. Sensors (2012).
5. Wearable Bioimpedance-Based Deep Learning Techniques for Live Fish Health Assessment under Waterless and Low-Temperature Conditions. Sensors (2023).
6. Effect of vitamin E on energy metabolism indicators and gill tissue structure of crucian carp (Carassius auratus) under cooling stress. Scientific Reports (2024).