Michael Maceina, Department of Fisheries and Allied
Aquacultures, Auburn University, Alabama
Keywords: largemouth bass, aquatic plants, recruitment, growth,
fishing
Conflicts are increasing between management of aquatic plants and
largemouth bass Micropterus salmoides. Largemouth bass anglers prefer to fish near
or in aquatic vegetation and usually demonstrate the greatest opposition to controlling
aquatic plants. The invasion and spread of exotic plants particularly hydrilla Hydrilla
verticillata and Eurasian milfoil Myriophyllum spicatum has in some instances
created excellent largemouth bass fisheries. Generally, the two rationale support
maintaining some plants for managing largemouth bass fisheries and include; 1) that
largemouth bass reproduction and early survival is enhance in vegetated habitats that will
subsequently produce more adults, and 2) angler catachability of fish is greater in
habitats that contain plants. However, excessive levels of aquatic plants can be
detrimental to largemouth bass fisheries. Typically, production of young largemouth bass
increases with plant coverage, but high densities and competition for food can reduce
growth and survival. When plant coverage exceeds 30-40% coverage, growth rates of fish are
reduced, body condition declines, and the population is skewed towards greater abundance
of smaller individuals. Usually, catch rates by anglers increase with plants, but the size
of fish caught declines. The "best science" indicates that 10 to 40% areal
coverage of submersed plants may be ideal for largemouth bass fisheries in larger water
bodies.