Fast submicrometer-scale imaging of whole zebrafish using the knife-edge scanning microscope

Area of Science:

• Neuroscience
• Developmental Biology
• Microscopy

Background:

• High-resolution 3D microscopy is crucial for understanding subcellular structures.
• Investigating whole organisms is essential for a complete understanding of structure and function.
• Existing methods may not provide comprehensive whole-organism data at high resolution.

Purpose of the Study:

• To present the application of the Knife-Edge Scanning Microscope (KESM) for imaging whole zebrafish larvae.
• To demonstrate the capability of KESM for high-resolution, 3D whole-organism imaging.
• To introduce improvements in sectioning and imaging robustness using a vibrating microtome.

Main Methods:

• Utilizing the Knife-Edge Scanning Microscope (KESM) for simultaneous sectioning and 3D imaging.
• Employing a diamond microtome integrated with line-scan imaging.
• Applying Nissl staining to whole zebrafish larvae.
• Investigating the use of a vibrating microtome for enhanced sectioning.

Main Results:

• Successful 3D imaging of a whole zebrafish larva (less than 3 mm long, <500 μm diameter) within 1 hour.
• Achieved high resolution of 0.6 μm × 0.7 μm × 1.0 μm.
• Demonstrated improved sectioning and imaging robustness with a vibrating microtome.

Conclusions:

• KESM is an effective tool for high-resolution, rapid 3D imaging of whole small organisms like zebrafish larvae.
• The KESM system provides unprecedented detail for studying whole-organism biology.
• Further refinements, such as using a vibrating microtome, enhance the reliability of this imaging technique.