Effects of structural remodelling on gill physiology

Area of Science:

• Comparative Physiology
• Aquatic Biology
• Fish Ecology

Background:

• Fish gills exhibit complex structure-function relationships crucial for respiration.
• Morphological plasticity allows reversible alterations in gill structure.
• Gill remodelling, such as lamellar growth/retraction, modifies functional surface area.

Purpose of the Study:

• To review reversible morphological changes in fish gills.
• To assess the physiological impacts of gill remodelling.
• To identify regulatory factors and phylogenetic distribution of gill plasticity.

Main Methods:

• Literature review of existing research on fish gill remodelling.
• Synthesis of data on morphological changes, physiological effects, and regulatory mechanisms.
• Analysis of phylogenetic patterns in gill plasticity.

Main Results:

• Gill remodelling involves changes in lamellar surface area in response to oxygen availability and metabolic demand.
• These structural adjustments directly impact oxygen uptake capacity at gill and whole-animal levels.
• Factors regulating plasticity and its widespread occurrence across fish phylogeny are discussed.

Conclusions:

• Gill remodelling is a key adaptive mechanism for fish facing environmental challenges.
• Further research is needed to fill knowledge gaps regarding regulation and evolutionary history.
• Understanding gill plasticity is vital for predicting fish responses to environmental change.