Hematological Responses to Environmental Stressors in Aquatic Species

Aquatic organisms rely on finely tuned blood parameters to maintain oxygen transport, immune defence and metabolic homeostasis. Environmental stressors such as temperature fluctuations, mineral or nanoparticle contamination, organic pollutants, heavy metals and pharmaceutical residues can disrupt erythrocyte counts, haemoglobin concentration, haematocrit values and leukocyte profiles. These alterations often reflect oxidative imbalance, immunomodulation and genotoxic stress, with downstream impacts on organ function and overall fitness. By integrating haematological measurements with biochemical and histopathological assessments, researchers are able to chart physiological coping strategies, identify early warning biomarkers and inform conservation, aquaculture management and pollution mitigation efforts on a global scale.

Research from Nature Portfolio

Recent studies have revealed that the interaction of elevated temperature and mineral nanoparticles can sharply impair blood-related health in freshwater catfish. Exposure to black sand nanoparticles under heat stress led to marked elevations in renal function markers such as creatinine and uric acid, alongside pronounced suppression of total antioxidant capacity and key enzymes (superoxide dismutase, catalase). Neuro-stress indicators, including acetylcholinesterase activity and cortisol levels, were increased, and histopathological analysis of spleen and kidney tissues uncovered lymphoid depletion, vascular congestion and melanomacrophage expansion. These findings underscore the synergistic threat posed by abiotic factors on the haematological resilience of aquatic species.

Hematological Responses to Environmental Stressors in Aquatic Species publication trend

The graph below shows the total number of articles in hematological responses to environmental stressors in aquatic species across all publications each year (not limited to Nature Index journals).

Technical terms

Erythrocyte: A red blood cell responsible for oxygen transport via haemoglobin.

Leukocyte: A white blood cell involved in immune defence and inflammation.

Hematocrit: The proportion of blood volume occupied by red blood cells.

Oxidative stress: A condition arising from an imbalance between reactive oxygen species and antioxidant defences.

Genotoxicity: The property of chemical agents that damage genetic information, leading to mutations.

Antioxidant enzymes: Proteins such as superoxide dismutase and catalase that neutralise reactive oxygen species.

References

1. Haemato-biochemical, mutagenic, and histopathological changes in Oreochromis niloticus exposed to BTX. Environmental Science and Pollution Research (2023).
2. Black sand nanoparticles and heat stress impacts the neurological and oxidative stress indices and splenic-renal histology of Clarias gariepinus. Scientific Reports (2024).
3. Significance Assessment of Amphora coffeaeformis in Arsenic-Induced Hemato- Biochemical Alterations of African Catfish (Clarias gariepinus). Frontiers in Marine Science (2020).
4. Spirulina platensis Alleviated the Hemotoxicity, Oxidative Damage and Histopathological Alterations of Hydroxychloroquine in Catfish (Clarias gariepinus). Frontiers in Physiology (2021).