While it is true that using imported SPF vannamei broodstock demands strict biosecurity maturation management including the use of only imported SPF polychaete… I have used locally obtained indigenous species of polychaete (Eunice philippinensis) for the maturation of wild-caught Penaeus monodon here in the Philippines.
The thing is, unlike other species of commercially produced SPF polychaete species, those ones I used are extracted from the coral reef (not from the mudflat or mangrove) far away from the black tiger prawn hatchery and it is the only hatchery in the area.
With such a bigger polychaete species like the Philippine Marine Bobbit Worm, one can skin this large polychaete like a snake and the entire worm slit open longitudinally along the midline to remove all the gut content and washed thoroughly, where only the CLEAN MEAT is utilized making it safe to feed to the wild-caught prawns… because polychaetes are just incidental mechanical carriers of shrimp viruses e.g. WSSV.
You can’t do this skinning and disemboweling procedure with the commercially available smaller species of imported polychaete... where I have fed this extremely large species to the wild-caught black tiger prawn as chopped (3-inch long after skinning and disemboweling)-meat-only, clean, processed frozen-thawed polychaete flesh.
This is called resourcefulness in applied science plus a wee bit of common sense... while "thinking outside the box"