Saprolignia…(cotton-looking fuzz patch)
You can mix a complete total saturation salt solution in a 5 gal bucket and fish for the culprits with this. As you catch them, place them in salt solution (straight Nacl) until they float belly up. leave for about 30 seconds after rolling over and then place them into a bucket filled with clean pond water until they are swimming normal. At that point you can release back into pond.
There is a parasite that is similar to lice that will attach to fish, this salt solution will literally fry them off. It dehydrates them so fast it kills the parasites.
