Publications
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Population biology of alewives, Alosa pseudoharengus, in Lake Michigan, 1949-70
Alewives were unknown in Lake Michigan before 1949, but became extremely abundant in the 1960s and soon exceeded the carrying capacity of the lake. In 1967 they were decimated by a lakewide mass mortality, and have since been less abundant as 'adults' (a?Y 120 mm long), although numerous young were produced in 1969-70 and the adult population appeared to be gradually increasing. Alewives were stud
Authors
Edward H. Brown
Age, growth, reproduction, and food of the burbot, Lota lota (Linnaeus), in southwestern Lake Superior
This study was based on 1,285 burbot (Lota lota) collected in three areas in southwestern Lake Superior in 1966-69. Age was determined from otoliths, the marginal zones of which were opaque from December to May and translucent from June to November. Average lengths of the age groups and annual increments were measured from a curve fitted by inspection to point estimates of lengths at capture. Burb
Authors
Merryll M. Bailey
Destruction of the ecosystem in the Great Lakes and possibilities for its reconstruction
This paper is a review of the sequence of events within the Great Lakes and their drainage to provide a basis for interpreting probable cause-and-effect relations between events of settlement and changes in the ecosystem of the Great Lakes. Possibilities of restoration of the lakes are discussed. A plan to do so must include (1) improvement of land uses in the drainage basin, (2) elimination of so
Authors
Stanford H. Smith
Rapid separation of polychlorinated biphenyls from DDT and its analogues on silica gel
Polychlorinated biphenyls (PCB's), which are used in industry worldwide (i), have been found as residues in numerous wildlife species (2-7). Because of the similarity in chemical characteristics, PCB compounds interfere with gas liquid chromatographic (GLC) analysis of certain chlorinated hydrocarbon insecticides (8). In the present study, we sought a rapid microanalytical procedure for separation
Authors
Diane Snyder, Robert E. Reinert
Biology of larval sea lampreys (Petromyzon marinus) of the 1960 year class, isolated in the Big Garlic River, Michigan, 1960-65
The early life history of the sea lamprey, from hatching to the first capture of metamorphosed individuals, is described from observations on a known-age population isolated in a tributary of southern Lake Superior. The population had its origin in the spring of 1960, when 722 sea lampreys nearing spawning condition were introduced into the Big Garlic River, Marquette County, Michigan, a stream th
Authors
Patrick J. Manion, Alberton L. McLain
Limnological data from Lake St. Clair, 1963 and 1965
Data, primarily benthological, are given for collections made at 14 stations. Included are records of water transparency, water temperature, water samples for chemical analysis, and bottom samples for the analysis of the macrobenthos.
Authors
Jarl K. Hiltunen
Selective food preferences of walleyes of the 1959 year class in Lake Erie
Stomachs were examined from 1,473 walleyes (Stizostedion vitreum vitreum) of the 1959 year class collected in western Lake Erie from June 1959 to October 1960. In the same period, the relative abundance and lengths of potential forage species were determined from trawl catches. The walleye fed almost entirely on fish. In 1959 the food was dominated first (in June and July) by yellow perch (Perca f
Authors
John W. Parsons
A basket for washing benthological samples
Since benthological samples collected with dredges are usually too large to be preserved in toto, a washing method must be employed to reduce the sample volume without losing or damaging the organisms. Traditionally, the sample is washed in a sieve until the volume is small enough for convenient handling or preservation. Most washing procedures are time-consuming and laborious. To save time in w
Authors
James H. Selgeby
Effects of temperature on electrolyte balance and osmoregulation of the alewife (Alosa pseudoharengus) in fresh and sea water
A study of the effects of temperature and salinity on ionoregulation in the alewife, Alosa pseudoharengus, revealed that concentrations of sodium, potassium, and calcium in plasma and muscle were similar in fish adapted to fresh water and those adapted to sea water. The non-stressed alewife is apparently an excellent ionoregulator in both environments.
Acute exposure to cold caused a shift in plas
Authors
Jon G. Stanley, Peter J. Colby
Population biology of lake trout (Salvelinus namaycush) of Lake Superior before 1950
Scale samples collected in 1948 were used to estimate the instantaneous total mortality rate (0.70) and growth for lake trout (Salvelinus namaycush) in Lake Superior before the population had been significantly reduced by the sea lamprey (Petromyzon marinus). Indirect evidence indicates that the instantaneous natural mortality rate was probably 0.10–0.25. The Ricker model was used to calculate yie
Authors
Gary T. Sakagawa, Richard L. Pycha
Plotting of bathythermograph transect data on a printer
A program for plotting bathythermograph transect data on a computer (IBM 1130) printer is available from the Great Lakes Fishery Laboratory. Temperature values are printed in positions proportional to their depths and distances from shore. Contour lines are drawn manually through the plotted points.
Authors
James B. Reynolds, Douglas R. McLain