Final answer:
The fish are removed from a pond for cleaning primarily to allow the pond to be drained and cleaned, which helps to maintain a healthy ecosystem for aquatic life.
Step-by-step explanation:
The purpose of removing fish from a pond so that the pond can be cleaned is to allow the pond to be drained and cleaned. This is essential to maintain the ecological balance and ensure a healthy living environment for aquatic life. The cleaning process is likely to involve removing sludge, algae, and other debris that can be harmful to the pond ecosystem. Moreover, the cleaning might also involve the repair of any pond structures and filtration systems to ensure proper functioning and to improve water quality.