Someone in the area of this Osprey nest site may very well be missing a Koi or large Gold Fish from their back yard pond…or perhaps from one of the many large ponds in the area.
Since Osprey are fish eaters I’m sure it must have been easily spotted from overhead.
The meal would be intended for the youngsters…but Dad did do a taste test before he delivered the meal. Shouldn’t be long before chicks will be visiable.