1. **Land formalities**: This is a necessary document for obtaining land use rights.

2. **Environmental Assessment Procedures**: Environmental assessment is an important step to ensure that the eel farming process meets the environmental requirements.

3. **Discharge License**: This is a necessary document issued by the government to ensure that waste and pollutants from the eel farming process are disposed of properly.

4. **Animal Epidemic Prevention Condition Certificate**: This is a document that ensures that the eel farming process will meet certain epidemic prevention standards.

5. **Farming Certificate**: This is a document issued by the local fishery department to prove that eel farming is legal.

6. **State Key Protected Wildlife Domestication and Breeding License**: If the eel is a protected animal, you need to apply for this document to farm.

7. **Industrial and Commercial Business License**: This is a necessary document for the enterprise to carry out production and operation.

If the eel is a protected wild animal, the above documents are required to go for farming. Please note that the procedures required for a specific farming business may vary depending on the region and specific situation, so it is recommended to consult with the relevant authorities for specific information.