When a fish looks bloated dosn't always mean internal parasites.
It can mean constipation, dropsy, swim bladder, internal parasites.
Like gilli has asked do scales stick out.
Have you stopped feeding for a few days.
Internal parasite signs are.
long stringy white poo or clear mucas poo.
Enlarged anus or red inflamed anus.
Looking skinny or bloated.
Sunken in belly.
Bent spine sometimes.
Sometimes the fish can swim on there sides with internal parasites.
Worms prutruding from the anus.