I wish I could speak Mandarin, perhaps the Chinese know something about them. In case anyone is interested, here is what the Silver Carp Wiki says:
Special methods have been developed for these fish, the most important being the "suspension method", usually consisting of a large dough ball that disintegrates slowly, surrounded by a nest of tiny hooks that are embedded in the bait.[3] The entire apparatus is suspended below a large bobber. The fish feed on the small particles that are released from the dough ball and will bump against the dough ball, with the intention of breaking off more small particles that can be filtered from the water, eventually becoming hooked on the tiny hooks.