Clinging for Shear Life: Active Input Improves Adhesion in the Northern Clingfish

Area of Science:

• Bio-inspired engineering
• Biomechanics
• Adhesive structures

Background:

• Nature features diverse adhesive structures like suction cups and toe pads.
• These structures inspire biomimetic technology but often overlook active animal input.
• The northern clingfish (Gobiesox maeandricus) is a model for robust suction cups.

Purpose of the Study:

• Investigate active suction modulation in northern clingfish under flow.
• Determine if live clingfish enhance suction more than passive structures.
• Understand contributions of behavior and morphology to adhesive performance.

Main Methods:

• Dynamic experimental design to simulate increasing flow speeds.
• Comparison of suction pressure, force, and detachment speed in live vs. euthanized clingfish.
• Utilized northern clingfish (Gobiesox maeandricus) as the model organism.

Main Results:

• Both live and euthanized clingfish increased suction with faster flows.
• Live clingfish demonstrated a significantly greater increase in suction than euthanized individuals.
• Results suggest a combination of active behavior and passive morphology contributes to suction performance.

Conclusions:

• Active modulation by animals significantly enhances adhesive performance.
• Behavioral and morphological factors are crucial for optimizing suction.
• Findings are vital for advancing bio-inspired suction cup technology.