Feeding
Some persons fancy that gold and silver fish need no food. It is true that they will subsist for a long time with nothing but water, when it is pure and frequently changed. They are best pleased with such jejune diet as bread or biscuit; but these should be given sparingly, lest, turning sour, they corrupt the water. They will also feed on the aquatic plant called lemna, or duck's-weed, and also on small fry. Hawkins, the editor of Walton, says that fine gravel should be strewed at the bottom of the vessel that contains the fish; and he directs them to be fed on bread and gentles, and to have their water frequently changed.