Visual Servoed Three-Dimensional Rotation Control in Zebrafish Larva Heart Microinjection System.

Area of Science:

• Biomedical Engineering
• Developmental Biology
• Zebrafish Models

Background:

• Zebrafish larva microinjection is crucial for cardiac disease research.
• Controlling non-transparent, irregularly shaped zebrafish larvae in 3-D presents unique challenges compared to spherical cells.

Purpose of the Study:

• To develop and validate a vision-servo system for automated 3-D rotation of zebrafish larvae.
• To enable precise orientation of zebrafish larvae for improved microinjection procedures.

Main Methods:

• A vision-servo system employing two micropipettes and a switched control strategy for rotation.
• Development of a custom rotational micromanipulator and a vision detection/online tracking algorithm.
• Implementation of a precise rolling control strategy for the zebrafish larva body.

Main Results:

• High success rates achieved: 94% for roll-axis rotation and 100% for yaw-axis rotation.
• Efficient operation with an average speed of 44 seconds per larva.
• Satisfactory rotation accuracy of 0.5° in the horizontal plane and 2.5° about the roll axis.

Conclusions:

• The developed vision-servo system effectively automates 3-D rotation of zebrafish larvae.
• This technology offers flexible manipulation capabilities for various microinjection applications in zebrafish research.