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Related Experiment Videos

Helicoidal architecture of fish eggshell

J P Grierson, A C Neville

    Tissue & Cell
    |January 1, 1981
    PubMed
    Summary
    This summary is machine-generated.

    Fish eggshells feature a unique helicoidal structure of protein microfibrils, strengthening them against deforming forces. This spiral arrangement, similar to insect cuticles, enhances shell integrity and mechanical resistance.

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    Area of Science:

    • Developmental Biology
    • Materials Science
    • Evolutionary Biology

    Background:

    • Previous studies misinterpreted arced patterns in fish eggshell electron micrographs.
    • These patterns were previously attributed to microfibrils or canals.

    Purpose of the Study:

    • To elucidate the true structure of the inner layer of fish eggshells.
    • To investigate the mechanical properties and evolutionary significance of this structure.

    Main Methods:

    • Analysis of electron micrographs of sectioned fish eggshells (cod, plaice, trout).
    • Structural and mechanical analysis of the inner eggshell layer.

    Main Results:

    • Identified a helicoidal structure composed of protein microfibrils in the inner layer of cod, plaice, and trout eggshells.

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  • Demonstrated that radial canals are forced into flattened, twisted ribbons by this helicoidal structure.
  • Observed convergent evolution between fish eggshell structures and insect cuticles.
  • Trout eggs exhibited high resistance to deforming forces (up to 380,000 N/m2).

    • Conclusions:

    • Fish eggshells possess a mechanically optimized helicoidal structure for resisting deforming forces.
    • The helicoidal structure and canal morphology show convergent evolution with insect cuticles.
    • Fish eggshells are mechanically sophisticated structures, well-designed for protection.