Yes, those. ^^^ you can also buy tilapia fillet already frozen. Just make sure there is no preservatives or anything but tilapia and water on the ingredients. There's no need to use "feeder fish" at all. Sally's silversides are frozen in water. They keep better and don't dry out and freezer burn if they're frozen in water. And don't store them in a self-defrosting freezer. As far as freezing to kill parasites goes, most household freezers aren't set cold enough. Some parasites will survive anything above around 5 degrees F. For freezing meats and fish, and for killing possible parasites in fish, i use a freezer that is set at, and stays around, -10 F.

But he got the name a little backwards. It's San Fransisco Bay brand, the product is Sally's silversides. They are sold at petco or where frozen brine shrimp and other frozen food for aquarium fish is sold. They're better than the Ocean Nutrition brand. Those dry out, freezer burn, etc because they're not packed in water.