A good article if you need some ideas about keeping the birds from your pond.  
 

"A fish pond can be an excellent way to create a relaxing, welcoming outdoor space, but it can also be an instant attraction for birds looking for an easy meal. If you've put all the work into creating a fish pond, especially a koi pond, it's worth investing in a few well-selected strategies to minimize risks."

Read More: https://www.housedigest.com/1327304/how-deter-birds-fish-pond/