This passage from Matthew 10:29-31 (ESV) came to mind:
"Are not two sparrows sold for a penny? And not one of them will fall to the ground apart from your Father. But even the hairs of your head are all numbered. Fear not, therefore; you are of more value than many sparrows."
My eldest daughter said "I'm sorry Dad." When the Matthew passage came to mind, it dawned on me that if God cares about birds, then He probably cares about fish as well. But that's not the point of the passage. The point is that if God cares about a sparrow, then he really cares about his child. Really really cares. Cares like crazy. And so, child of God, do not be afraid.