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<p>Fish brain undergoes neuronal rearrangements in response to changes in aquatic conditions and reproductive phases. The neurons are crucial for understanding regenerative plasticity in the teleost brain. Much of the neuroplasticity research focused on changes in brains size and on neurogenesis. Till date there was no study reported on the role of neuronal spine density to understand neuroplasticity. The present study discussed variations in spine density of monopolar, bipolar and stellate neurons in different brain regions during resting, preparatory, and pre-spawning phases of the reproductive cycle under varied hypoxia (1.9 ± 0.1 and 0.9 ± 0.1&#xa0;mg/L dissolved oxygen) for 8 and 12&#xa0;h in the freshwater catfish <i>Heteropneustes fossilis</i>. The result shows that due to hypoxia, neuronal spine density registered variations with respect to brain regions and reproductive phases<b>.</b> The study discussed efficiency of the air breathing fish to cope up with hypoxic conditions swiftly without significant damage to neuronal spine density variation.</p>

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Hypoxia and seasonal impacts on neuronal spine density in brain regions of freshwater catfish, Heteropneustes fossilis

  • 期刊论文

  • 发表日期：

    2026年8月5日

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  • Shweta Arya,
  • Adarsh Kumar,
  • Bulbul Ali,
  • Neelam Sharma,
  • Rohit Kumar Gautam,
  • Aryaipsha Jena,
  • Abha Mishra

摘要

Fish brain undergoes neuronal rearrangements in response to changes in aquatic conditions and reproductive phases. The neurons are crucial for understanding regenerative plasticity in the teleost brain. Much of the neuroplasticity research focused on changes in brains size and on neurogenesis. Till date there was no study reported on the role of neuronal spine density to understand neuroplasticity. The present study discussed variations in spine density of monopolar, bipolar and stellate neurons in different brain regions during resting, preparatory, and pre-spawning phases of the reproductive cycle under varied hypoxia (1.9 ± 0.1 and 0.9 ± 0.1 mg/L dissolved oxygen) for 8 and 12 h in the freshwater catfish Heteropneustes fossilis. The result shows that due to hypoxia, neuronal spine density registered variations with respect to brain regions and reproductive phases. The study discussed efficiency of the air breathing fish to cope up with hypoxic conditions swiftly without significant damage to neuronal spine density variation.