Especially with all the dinosaurs on board.
Not just dinos, but all the freshwater (or saltwater?) fish on board. One or the other must have been on-board or they would have died (too much salinity/not enough salinity).
Not to mention the food for the elephants alone would have consumed 2% of the entire net volume of the ark. That doesn’t include food for other big animals like rhinos, giraffes, zebras, horses, etc.
And that’s at a 50% food consumption rate (half their normal daily consumption) AND assuming the hay is packed as tight as a wire-bound bale of hay; if it was loose-stack (which it most likely was), you’ve got 5% net volume devoted to just food for only the elephants.