I had/(still have?) trout in my pond over the winter. They voraciously ate pellets. However, when the water muddied up, they wouldn't come up. Or, if it was super windy they wouldn't come up. I figured they were very much sight feeding and when something interfered with that they didn't notice the feed. I say just give it a bit - and keep trying small amounts of food as the pond clears (don;t put a lot of food out that isn't eaten). I also found it useful to throw the food way up into the air when feeding to make as loud a pellet splash as possible. Good luck, pond trout are a blast.