Annulus formation on scales of four species of coregonids reared under artificial conditions
Walter J. Hogman
1968, Journal of the Fisheries Research Board of Canada (25) 2111-2122
Scales from known-age coregonids reared in the laboratory were examined to determine when annuli formed and to learn possible factors of their formation. Scales were taken monthly from marked fish for periods up to 21 months. Scales were also examined from fish that died and from preserved specimens of young-of-the-year...
Production of sea lamprey larvae from nests in two Lake Superior streams
Patrick J. Manion
1968, Transactions of the American Fisheries Society (97) 484-486
The life history of the landlocked sea lamprey, Petromyzon marinus, has been described by several authors, the two most recent of which are Applegate and Wigley. The only information on the production of larvae from nests of the sea lamprey was reported by Applegate, who counted the larvae from three...
An electric beam trawl for the capture of larval lampreys
Alberton McLain, Frederick H. Dahl
1968, Transactions of the American Fisheries Society (97) 289-293
The chemicals used to control the sea lamprey, Petromyzon marinus, in the Great Lakes have drastically reduced populations of larval lampreys in tributary streams. These larvicides are too costly and difficult to apply, however, in inland lakes, estuaries, and bays. Populations of sea lampreys in these areas constitute...
Movements of adult lake trout in Lake Superior
Jerold F. Rahrer
1968, Transactions of the American Fisheries Society (97) 481-484
Returns from mature lake trout (Salvelinus namaycush) tagged in western Lake Superior in 1959 and 1962-65 described here suggest that trout disperse widely from the spawning grounds after spawning and return in subsequent years. Although the data were not extensive, returns from lake trout tagged near Keweenaw Point in 1950...
Comparative embryology of five species of lampreys of the upper Great Lakes
Allen J. Smith, John H. Howell, George W. Piavis
1968, Copeia (1968) 461-469
The four species of lampreys native to the upper Great Lakes (American brook lamprey, Lampetra lamotteni; chestnut lamprey, Ichthyomyzon castaneus; northern brook lamprey, I. fossor; and silver lamprey, I. unicuspis) were collected in various stages of their life cycle and maintained in the laboratory until sexually mature. Secondary sex characters...
Species succession and fishery exploitation in the Great Lakes
Stanford H. Smith
1968, Journal of the Fisheries Research Board of Canada (25) 667-693
The species composition of fish in the Great Lakes has undergone continual change since the earliest records. Some changes were caused by enrichment of the environment, but others primarily by an intensive and selective fishery for certain species. Major changes related to the fishery were less frequent before the late...
The alewife
Stanford H. Smith
1968, Limnos (1) 12-20
When the first alewife, Alosa pseudoharengus, was discovered in Lake Michigan near South Manitou Island on May 5, 1949, few people would have guessed that it would become the best known fish of the lake in less than two decades. Now it competes only with the coho salmon in...
Seasonal depth distribution of fish in southeastern Lake Michigan
LaRue Wells
1968, Fishery Bulletin (67) 1-15
This study is based on systematic seasonal bottom trawling between 3 and 50 fathoms (5.5 and 91.5 m.) from February to November 1964 and supplementary information from other experimental fishing at additional depths and with other gear. The seasonal depth distribution of eight common species is described, and temperature relations...
An improved girthometer for studies of gill net selectivity
Richard S. Wydoski, David R. Wolfert
1968, Progressive Fish-Culturist (30) 62-64
Gill nets are effective for collecting samples of many fish species. These nets may be highly selective in their catch, depending on the mesh size or sizes used and on the size distribution and body shape of the fish in the population. Early studies related mesh selectivity to...
Distribution and abundance of the Japanese snail, Viviparus japonicus, and associated macrobenthos in Sandusky Bay, Ohio
David R. Wolfert, Jarl K. Hiltunen
1968, Ohio Journal of Science (68) 32-40
A survey of the macrobenthos of Sandusky Bay, Lake Erie, in June, 1963, provided information on the abundance and distribution of the introduced Japanese snail, Viviparus japonicus, which has become a nuisance to commercial seine fishermen. The abundance and distribution varied considerably within the bay; at the time of the...
Infectious pancreatic necrosis: Selection of virus-free stock from a population of carrier trout
K. Wolf, M. C. Quimby, C. P. Carlson, G. L. Bullock
1968, Journal of the Fisheries Research Board of Canada (25) 383-391
Infectious pancreatic necrosis (IPN) is a virulent disease of young trouts and is easily transmitted from infected animals through water and with eggs. At present, the most effective control measure consists of propagation of specific pathogen-free stock. Methods are described for using fish cell cultures to detect IPN virus in...
Antimycin for controlling sunfish populations in ponds
R.M. Burress
1968, Farm Pond Harvest (2) 11,12, 22
Abstract has not been submitted...
Current status of whirling disease in salmonids in U.S
G. L. Hoffman
1968, American Fishes and U.S. Trout News (November-December) 10, 12, 19-20
Gas chromatographic separation and quantitative estimation of barbiturate mixtures in solid dosage forms
J. L. Allen
1968, Journal of the Association of Official Analytical Chemists (51) 619-621
A gas chromatographic method has been described for the analysis of mixed barbiturates in solid dosage forms. Analysis on a 10% SE-30 column gave good separations for butabarbital, amobarbital, secobarbital, pentobarbital, and/or phenobarbital; amobarbital is not separated adequately from pentobarbital. An internal standard, mephobarbital, is used to minimize injection errors....
Simultaneous determination of tantalum and hafnium in silicates by neutron activation analysis
L. P. Greenland
1968, Analytica Chimica Acta (42) 365-370
A neutron activation procedure suitable for the routine determination of tantalum and hafnium in silicates is described. The irradiated sample is fused with sodium peroxide and leached, and the insoluble hydroxides are dissolved in dilute hydrofluoric acid-hydrochloric acid. After LaF3 and AgCl scavenges, tantalum and hafnium...
Activity product constant of cryolite at 25°C and one atmosphere using selective-ion electrodes to estimate sodium and fluoride activities
C. E. Roberson, J.D. Hem
1968, Geochimica et Cosmochimica Acta (32) 1343-1351
The activity product constant of cryolite (Na3AlF6) at 25°C and 1 atm total pressure was calculated from data for solutions from which synthetic cryolite or mixtures of cryolite and a solid apparently related to ralstonite had precipitated. The activities of fluoride and of sodium were estimated using specific ion...
Geologic history of the continental margin of North America in the Bering Sea
D.W. Scholl, E. C. Buffington, D.M. Hopkins
1968, Marine Geology (6) 297-330
The North American continental margin beneath the Bering Sea is nearly 1,300 km long and extends from Alaska to eastern Siberia. The margin is a canyon-scarred 3,200–3,400-m high escarpment separating one of the world's largest epicontinental seas (the shallow Bering Sea) and the...
Measurement of geothermal flux through poorly consolidated sediments
J.H. Sass, R. J. Munroe, A.H. Lachenbruch
1968, Earth and Planetary Science Letters (4) 293-298
In many regions, crystalline rocks are covered by hundreds of meters of unconsolidated and poorly consolidated sediments. Estimates of heat flux within these sediments using standard continental techniques (temperature and conductivity measurements at intervals of 10 to 30 meters) are unreliable, mainly...
Determination of gold in rocks by neutron activation analysis using fire-assay preconcentration
F.O. Simon, Hugh T. Millard Jr.
1968, Analytical Chemistry (40) 1150-1152
No abstract available....
Variation of Nb-Ta, Zr-Hf, Th-U and K-Cs in two diabase-granophyre suites
D. Gottfried, L. P. Greenland, E.Y. Campbell
1968, Geochimica et Cosmochimica Acta (32) 925-947
Concentrations of Nb, Ta, Zr, Hf, Th, U and Cs have been determined in samples of igneous rocks representing the diabase-granophyre suites from Dillsburg, Pennsylvania, and Great Lake, Tasmania.Niobium and tantalum have a three to fourfold increase with differentiation in each of the suites. The chilled margin of the Great...
Dissociation constants of KSO4- from 10°-50°C
A.H. Truesdell, P. B. Hostetler
1968, Geochimica et Cosmochimica Acta (32) 1019-1022
A cell without liquid junction was used to obtain dissociation constants for the reaction: KSO4− = K+ +SO42−. At 10°, 25°, 38° and 50°C, values for Kdiss KSO4− are, respectively, 0.195, 0.142, 0.117, and 0.095. At 25°C, , and <img class="imgLazyJSB inlineImage" title=""...
Water sample filtration unit
M. W. Skougstad, G.F. Scarbro Jr.
1968, Environmental Science & Technology (2) 298-301
No abstract available....
Determination of palladium, platinum and rhodium in geologic materials by fire assay and emission spectrography
J. Hapfty, L.B. Riley
1968, Talanta (15) 111-117
A method is described for the determination of palladium down to 4ppb (parts per billion, 109), platinum down to 10 ppb and rhodium down to 5 ppb in 15 g of sample. Fire-assay techniques are used to preconcentrate the platinum metals into a gold bead, then...
Mineralogy as a function of depth in the prehistoric Makaopuhi tholeiitic lava lake, Hawaii
B.W. Evans, J.G. Moore
1968, Contributions to Mineralogy and Petrology (17) 85-115
The electron probe X-ray microanalyzer has been used to determine the compositional variability of the groundmass minerals and glass in 10 specimens from a complete 225-foot section of the prehistoric tholeiitic lava lake of Makaopuhi Crater, Hawaii. The order of beginning of crystallization was: (1) chromite, (2) olivine, (3) augite,...
Reward banding to determine reporting rate of recovered mourning dove bands
R. E. Tomlinson
1968, Journal of Wildlife Management (32) 6-11
Reward bands placed on the other leg of certain regularly banded immature mourning doves (Zenaidura macroura) were used to develop information on reporting rates of recovered dove bands. Reports from 15 widely separated sections of the United States showed considerable variation in recovery rate of doves both with and without...
