Osmoregulatory Mechanisms in Freshwater Crustaceans

Freshwater crustaceans maintain internal homeostasis by actively regulating ion and water balance across challenging osmotic gradients. The gill epithelium serves as the principal site for ion uptake and excretion, employing transport proteins such as the Na+/K+-ATPase, Na+-K+-2Cl– cotransporter and V-type H+-ATPase, alongside selective ion channels. Under hypo-osmotic conditions, crustaceans remodel gill lamellae to increase surface area and mitochondrial density, enhancing ion transport capacity. Concurrently, intracellular concentrations of organic osmolytes—such as free amino acids and trehalose—are modulated to counteract cell swelling and stabilise macromolecules. The antennal gland refines haemolymph composition through ion reabsorption and urine dilution, while neuroendocrine signals, including crustacean hyperglycaemic hormone, orchestrate systemic adjustments in metabolism and ion transport. Recent multi-omics investigations have revealed extensive transcriptional, proteomic and metabolomic reprogramming during salinity challenge, underscoring both conserved ionic pathways and species-specific adaptations. These integrated mechanisms underpin the exceptional euryhaline capacities of many freshwater decapods, ensuring their survival, growth and reproductive success in fluctuating aquatic environments.

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Osmoregulatory Mechanisms in Freshwater Crustaceans publication trend

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Technical terms

Haemolymph osmolality: the total solute concentration in the circulatory fluid, determining water movement across membranes.

Na+/K+-ATPase: a membrane enzyme that exchanges intracellular Na+ for extracellular K+, driving active ion transport.

Na+-K+-2Cl– cotransporter (NKCC): a symporter that moves Na+, K+ and Cl– ions simultaneously into cells, crucial for ion uptake.

Organic osmolytes: small molecules, including free amino acids and sugars like trehalose, that cells accumulate to balance osmotic pressure without disrupting metabolism.

Transcriptomics: the comprehensive study of RNA transcripts, revealing gene expression changes in response to environmental stress.

References

1. Trehalose mediates salinity-stress tolerance in natural populations of a freshwater crustacean. Current Biology (2024).
2. Regulation and Response Mechanism of Acute Low-Salinity Stress during Larval Stages in Macrobrachium rosenbergii Based on Multi-Omics Analysis. International Journal of Molecular Sciences (2024).
3. Multi-Effects of Acute Salinity Stress on Osmoregulation, Physiological Metabolism, Antioxidant Capacity, Immunity, and Apoptosis in Macrobrachium rosenbergii. Antioxidants (2023).