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Updated: May 8, 2026

Characterization Of Multi-layered Fish Scales (Atractosteus spatula) Using Nanoindentation, X-ray CT, FTIR, and SEM
Published on: July 10, 2014
Structural Insight into Coexistence of Flexibility and Toughness in Ctenoid Fish Scales
Debasis Sen1,2, Avik Das1, Jitendra Bahadur1,2
1Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
Fish ctenoid scales achieve strength and flexibility through a unique oriented-strand-board-like nanopatterning. This structure, unlike cycloid scales, offers superior protection and hydrodynamic benefits.
Area of Science:
- Biomaterials Science
- Fish Biology
- Structural Mechanics
Background:
- Fish scales offer protection and hydrodynamic advantages.
- Ctenoid scales exhibit both strength and flexibility, unlike cycloid scales.
Purpose of the Study:
- To investigate the structural basis for the dual properties of strength and flexibility in ctenoid scales.
- To compare the nanostructure of ctenoid scales with cycloid scales.
Main Methods:
- Spatially evolved anisotropic small-angle X-ray scattering (SAXS).
- Analysis of scale nanostructure and material properties.
Main Results:
- Ctenoid scales feature a rotating oriented-strand-board-like nanopatterning.
- This structure differs from the Bouligand architecture found in cycloid scales.
- Ctenoid scales demonstrate excellent thermal stability up to 100°C and acid resistance.
Conclusions:
- The oriented-strand-board-like nanostructure is responsible for the strength and flexibility of ctenoid scales.
- Ctenoid scales possess robust material properties suitable for various environmental conditions.
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