John Gill Commentary Mark 6:43

"And they took up broken pieces, twelve basketfuls, and also of the fishes." — Mark 6:43 (ASV)

And they took up twelve baskets full of the fragments
Of the broken pieces of bread, after all had eaten, and were satisfied:

and of the fishes ;
what remained of them:,

for though there was but one loaf for a thousand persons and more, and two small fishes to be divided among five thousand and more: yet, through the wonderful power of Christ increasing both, as they were distributing and eating, there was enough of both for them all, and such a quantity of each left as filled twelve baskets.