OK, I take it back. I should have said I had not seen one fly yet!
I was out this morning and it appeared nature was saying "not true, my friend, not true"
Not only did I see flies (not in large numbers yet) but I also saw bees up in the mango canopy instead on the flowers below the tree. There was even a pair of love bugs.
So I believe I was just a bit early and should wait for the flowers to open before I declare a paucity of pollinators. The new mantra should be when the flowers open, they will come.
A lingering thought, maybe I don't need dead fish, or perhaps I should hedge my bets.