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Page 4551, results 113751 - 113775

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Population dynamics and interagency management of the bloater (Coregonus hoyi) in Lake Michigan, 1967-1982
Edward H. Brown Jr., Ronald W. Rybicki, Ronald J. Poff
1985, Technical Report 44
This paper examines the population dynamics of the bloater (Coregonus hoyi) in Lake Michigan during a progressive decline in abundance from about the mid1960s through the mid1970s, and during a subsequent recovery that is still underway. The study focused on developing a data base and methodology for projecting fishable surpluses,...
Review of fish species introduced into the Great Lakes, 1819-1974
Lee Emery
1985, Technical Report 45
This review is based on an extensive literature search, combined with updated information obtained from biologists, and unpublished reports from private, state, and federal organizations throughout the Great Lakes basin. The chronological review lists 34 species of fishes in 13 families that were introduced into the basin from 1819 to...
A geophysical and geological study of Laguna de Ayarza, a Guatemalan caldera lake
L. J. Poppe, C. K. Paull, C. G. Newhall, J.P. Bradbury, J. Ziagos
1985, Journal of Volcanology and Geothermal Research (25) 125-144
Geologic and geophysical data from Laguna de Ayarza, a figure-8-shaped doublecaldera lake in the Guatemalan highlands, show no evidence of postcaldera eruptive tectonic activity. The bathymetry of the lake has evolved as a result of sedimentary infilling. The western caldera is steep-sided and contains a large flat-floored central basin 240...
Comparative sensitivities of diagnostic procedures used to detect bacterial kidney disease in salmonid fishes
R. C. Cipriano, C. E. Starliper, J. H. Schachte
1985, Journal of Wildlife Diseases (21) 144-148
Kidney and spleen homogenates from each of 60 coho salmon (Oncorhynchus kisutch) and steelhead trout (Salmo gairdneri) were examined for detection of Renibacterium salmoninarum. The proportions of positives differed widely with the detection procedures used: in coho salmon, 5% were positive by the Gram-stain...
Glugea pimephales Fantham, Porter, and Richardson, 1941, n comb (Microporidia: Glugeidae) in the fathead minnow, Pimephales promelas
C. Morrison, G. L. Hoffman, V. Sprague
1985, Canadian Journal of Zoology (63) 380-391
A microsporidan parasite, fitting the description of Nosema pimephales Fantham, Porter and Richardson, 1941, was found in fry of the fathead minnow, Pimephales promelas Rafinesque, from the Wray Fish Hatchery near Fort Morgan, Colorado. More detailed studies proved it to be a typical species of Glugea Thélohan, 1891, to which genus it was transferred. Presence of...
Evaluation of glutamic acid and glycine as sources of nonessential amino acids for lake trout (Salvelinus namaycush) and rainbow trout (Salmo gairdnerii)
S. G. Hughes
1985, Comparative Biochemistry and Physiology, Part A: Physiology (81A) 669-671
1. A semi-purified test diet which contained either glutamic acid or glycine as the major source of nonessential amino acids (NEAA) was fed to lake and rainbow trout.2. Trout fed the diet containing glutamic acid consistently showed better growth and feed conversion efficiencies than those fed the diets containing glycine.3....
Effects of cumulative loading level, as fish weight per unit flow, on water quality and growth of lake trout
J. W. Meade, J.S. Ramsey, J.C. Williams
1985, Journal of the World Mariculture Society (16) 40-51
Lake trout, Salvelinus namaycush, were cultured in a series of five rearing units (in triplicate). The fish removed available oxygen in each unit, from about 10.5 to 7.0 mg/L. Oxygen was replaced, through aeration, between rearing units. Effects of cumulative loading, as fish weight/flow rate, are described in terms of water...
Movement of underyearling walleyes in response to odor and visual cues
D. V. Rottiers, C. A. Lemm
1985, Progressive Fish-Culturist (47) 34-41
Underyearling walleyes, allowed to move freely in a Y‐shaped chamber into which various substances were added to one arm or another, were attracted to sodium chloride, sucrose, glutathione, vitamin B12, betaine, arginine, Daphnia slurries, some fish slurries, washings from live Daphnia and Artemia, and some commercial fish foods. They avoided...
Niacin requirement for optimum growth, feed conversion and protection of rainbow trout, Salmo gairdneri Richardson, from ultraviolet-B irradiation
H. A. Poston, M.J. Wolfe
1985, Journal of Fish Diseases (8) 451-460
Triplicate groups of 75 rainbow trout, Salmo gairdneri Richardson, (mean weight 0–76 g) were fed a semipurified diet containing added niacinamide in amounts of 0.0, 1.25, 2.5. 5, 10, 20, 40, 80 or 160 mg/kg diet (ppm), for 16 weeks to determine the amount of niacinamide needed...
Ecological effects of rubble-mound breakwater construction and channel dredging at West Harbor, Ohio (western Lake Erie)
Bruce A. Manny, Donald W. Schloesser, Charles L. Brown, John R. P. French III
1985, Technical Report EL-85-10
The investigation reported herein indicated that breakwater construction and associated channel dredging activities by the US Army Corps of Engineers in western Lake Erie at the entrance to West Harbor (Ohio) had no detectable adverse impacts on the distributions or abundances of macrozoobenthos and fishes. Rather, increases were noted in...
Classification of wetlands and deepwater habitats of the United States
L.M. Cowardin, V. Carter, F.C. Golet, E.T. LaRoe
1985, FWS/OBS 79/31
This classification, to be used in a new inventory of wetlands and deepwater habitats of the United States, is intended to describe ecological taxa, arrange them in a system useful to resource managers, furnish units for mapping, and provide uniformity of concepts and terms. Wetlands are defined by plants (hydrophytes),...
Maneuverability of the Humboldt penguin (Spheniscus humboldti) during swimming
Clifford A. Hui
1985, Canadian Journal of Zoology (63) 2165-2167
Analyses of high-speed film of captive Humboldt penguins (Spheniscus humboldti) show that there is no correlation between the radii of submerged turns and swimming speed. The sharpest turns had a mean turn radius (n = 5) of 0.14 m (0.24 body lengths), were powered by beating wings, and used multiple steering structures (beak,...
Tolerance of West Indian manatees to capture and handling
T. J. O'Shea, G. B. Rathbun, E.D. Asper, S.W. Searles
1985, Biological Conservation (33) 335-349
Ninety-two West Indian manatees (Trichechus manatus) have been captured in the southeastern United States from October 1975 through November 1983 with no evidence of an unusual susceptibility to capture myopathy. Of these, 53 were radio-tracked or observed in the field following capture with no evidence of delayed capture stress. Blood samples obtained...
Altered energy metabolism in an irradiated population of lizards at the Nevada Test Site
K.A. Nagy, P.A. Medica
1985, Radiation Research (103) 98-104
Field metabolic rates (via doubly labeled water), body compartmentalization of energy stores, and energy assimilation efficiencies were measured to assess all avenues of energy utilization in Uta stansburiana living in a low-level γ-irradiated plot in Rock Valley, Nevada. Comparison of energy budgets for radiation-sterilized females with those of nonirradiated control...
Heavy metals in white-tailed deer living near a zinc smelter in Pennsylvania
Louis Sileo, W. Nelson Beyer
1985, Journal of Wildlife Diseases (21) 289-296
White-tailed deer (Odocoileus virginianus (Zimmermann)) shot within 20 km of the zinc smelters in the Palmerton, Pennsylvania area contained extremely high renal concentrations of cadmium (372 ppm dry weight (dw)) and zinc (600 ppm dw). The deer with the highest renal zinc concentration was shot 4 km from the smelters and...
Allowable ammonia for fish culture
J. W. Meade
1985, Progressive Fish-Culturist (47) 135-145
A review of the published literature on effects of ammonia on fish indicates that un‐ionized ammonia alone is probably not the cause of gill hyperplasia, indicative of, or previously attributed to, chronic ammonia poisoning. The maximum safe concentration of un‐ionized ammonia is unknown, but in many cases it is not...
Immune response of channel catfish, Ictalurus punctatus Rafinesque, to bacterial and protozoan antigens administered by three routes
S. W. Pyle, D. L. Dawe
1985, Aquaculture (46) 1-10
Experiments were conducted to measure the agglutinating antibody response of channel catfish to a particulate and a soluble antigen administered simultaneously by one of three routes. Specific antibody production in response to administration of particulate brucella tube-test antigen via intramuscular injection, oral drench, and topical application peaked at 3 weeks...