Charles H. Spurgeon on Psalms 105:29

And slew their fish. Besides the fish cured, or sent to market for the table, a very great quantity was set apart expressly for feeding the sacred animals and birds, —as the cats, crocodiles, ibises, and others; and some of the large reservoirs, attached to the temples, were used as well for keeping fish as for the necessary ablutions of the devout and for various purposes connected with religion. The quantity of fish in Egypt was a very great boon to the poor classes, and when the Nile overflowed the country inhabitants of the inland villages benefited by this annual gift of the river, as the land did by the fertilizing mud deposited upon it. The canals, ponds, and pools, on the low lands, continued to abound in fish, even after the inundation had ceased; and it was then that their return to the Nile was intercepted by closing the mouths of the canals. Sir J. Gardner Wilkinson, in "A Popular Account of the Ancient Egyptians," 1854.