After a kill off from LBV, anglers have reported catching fewer bass, in particular bigger fish. But indications are that an infected fishery will recover within a year or two. More largemouth bass are killed annually in the U. S. by other known diseases than by LBV.
LBV is related to the virus found in frogs and other amphibians and is almost identical to a virus isolated in some fish imported to the U.S. for the aquarium trade. Most bass that carry the LBV will appear completely normal. In some cases the virus has triggered disease; dying fish will be near the surface and have trouble swimming and remaining upright. That’s because the virus attacks the swim bladder, causing bass to lose their ability to maintain buoyancy. Diseased fish might also appear bloated. Sores may appear on some fish but are caused by secondary infections of bacteria or fungi.