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Technical Papers
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Studies on Selected Myxobacteria Pathogenic for Fishes and on Bacterial Gill Disease in Hatchery-reared Salmonids
Morphological, physiological, and serological studies on 55 myxobacteria isolated principally from gill disease, tail rot, and other myxobacterial infections showed that a variety of myxobacteria occur in these infections. Athought there were different morphological types of myxobacteria, all strains from freshwater and estuarine sources were physiologically similar. Isolates from marine sources were physiologically less active than the other test organisms.
Toxicity of Some Insecticides to Four Species of Malacostracan Crustaceans
Acute and long-term (20-day) toxicities of 40 insecticides to four species of freshwater malacostracan crustaceans (the scud, crayfish, glass shrimp, and aquatic sowbug) were determined in static and intermittent-flow bioassays. An extremely wide range in toxicity was found with scuds generally being the most sensitive, followed in descending order by glass shrimp, sowbugs, and crayfish.
Food Habits of Five Centrarchids During Filling of Beaver Reservoir, 1965-66
Stomach contents were examined from 1,886 largemouth bass, 334 spotted bass, 1,689 bluegills, 918 green sunfish, and 579 longear sunfish from the shoreline areas of Beaver Reservoir during two of the first three years of filling. Quality and quantity of food by seasons and size is related to abundance of the principal forage. Greatest volume of food were found in winter-spring months when water level rose and inudated soils for the first time; terrestrial earthworms, insects, slugs, spiders, centipedes, sowbugs, and work snakes were major foods in these seasons, particularly for fish of 101-200 mm in total length. Except for the larger bass, fish had smallest volumes in stomachs in later fall, following the decline that began when water levels stabilized in June.
Changes in the Fish Population in Lake Francis Case in South Dakota in the First 16 Years of Impoundment
The total number of adult fish in Lake Frances Case, a main steam Missouri River Reservoir, has declined since impoundment in 1952. Goldeye, channel catfish, and northern redhorse have probably remained the same; emerald shiner, white bass, walleye, and possibly flathead catfish have increased. The sauger population began to decline at about the time walleye numbers increased. Some species formerly present have become rare. Forage species in the reservoir were gizzard shad, emerald shiner, and yellow perch, but these were not present in large enough numbers to provide an abundant forage fish population.
