Drop them in water to get most of the extra dirt out of their digestive tracts. It purges them much like we do with crawfish here in Louisiana, mmmmmmmm crawfish. Sorry got side tracked. It will keep the mess down. Keep in mind though the minerals, plant matter, and other partially broken down food items in the digestive tracts of the prey items we feed our rays is the only way that they get some of these nutrients. They evolved eating whole prey items and they need everything in them. That is why feeding them fish filets only over time will lead to rays not quite as healthy as those fed a variety of whole items.
I don't know about everyone here, but pellets just don't seem cost effective to me. My fish eat about 9 ounces a day of whole silversides or market shrimp (fresh caught which i can get for about 2.50lb, don't be jealous the crime rate makes up for our cheap ray food. If I was to feed massivore it would cost me $10 a day to feed my fish even if I take into consideration dry weight vs wet weight and equalize the protein values. That is insane to me. I can feed a family of great danes for that. What we really need to do is all set up vermicomposting systems where we use worms to break down our vegetable based food waste. We use the compost to grow our vegetables or sell, whatever works for you, and we feed the worms to our fish. They are always the favorite of all rays, they carry a ton of nutrition, because they are terrestrial there is almost no possibility for disease transmission, and they would be FREE!
