(1) Pathogens are classified into categories based on their presence and relative threat to existing state fisheries for purposes of Montana's fish health and importation statutes.

(2) The following pathogens are designated Class A pathogens and pose a substantial threat to the health of state fisheries:

(a) infectious hematopoietic necrosis virus (IHNV);

(b) infectious pancreatic necrosis virus (IPNV);

(c) viral hemorrhagic septicemia virus (VHSV);

(d) Oncorhynchus masou virus (OMV);

(e) white sturgeon irido virus (WSIV);

(f) largemouth bass virus (LMBV);

(g) spring viremia of carp virus (SVCV);

(h) koi herpes virus;

(i) infectious salmon anemia virus (ISAV); and

(j) channel catfish virus.

(3) The following pathogens are designated Class B pathogens and may pose a threat to the health of state fisheries:

(a) Bothriocephalus acheilognathi (Asian tapeworm);

(b) Renibacterium salmoninarum (bacterial kidney disease);

(c) Aeromonas salmonicida (furunculosis);

(d) Myxobolus cerebralis (salmonid whirling disease);

(e) Heterosporis sp.;

(f) Missouri River sturgeon irido virus (MRSIV);

(g) enteric septicemia of catfish (ESC);

(h) PKX proliferative kidney disease (PKD);

(i) Ceratomyx shasta;

(j) erythrocytic inclusion body syndrome virus (EIBSV);

(k) Edwardsiella ictaluri; and

(l) Nucleospora salmonis.

(4) Based on the availability of new information related to the threat to state fisheries the department will review pathogens designated as Class A and B and will reclassify pathogens as necessary.

(5) The department will review the presence of unlisted pathogens as necessary to determine any risks associated with fish importations. An importation request may be delayed while the department determines the risk of a new pathogen.