Effects of Upwelling on Local Abundance and Distribution of Larval Alewife (Alosa pseudoharengus) in Eastern Lake Michigan

1982 ◽  
Vol 39 (11) ◽  
pp. 1531-1537 ◽  
Author(s):  
George R. Heufelder ◽  
David J. Jude ◽  
Frank J. Tesar
Keyword(s):  
Thermal Shock ◽  
Lake Michigan ◽  
Larval Fish ◽  
Alosa Pseudoharengus ◽  
Nearshore Zone ◽  
Widespread Distribution ◽  
Local Abundance ◽  
Abundance And Distribution

Intrusion of cold (usually < 10 °C), hypolimnetic water into the Lake Michigan nearshore zone (≤ 15 m) substantially changed local abundance and distribution of larval alewife (Alosa pseudoharengus) during the summers of 1977–79. During upwelling, larval fish densities were reduced to below 1000 larvae/1000 m3; when no upwelling occurred densities commonly exceeded 5000 larvae/1000 m3. Widespread distribution to depths of at least 15 m was found in the absence of upwelling, while during upwelling larvae were more concentrated in water ≤ 6 m deep. Additionally, at depths > 3 m during upwelling, alewife larvae were most abundant in bottom strata, a trend not observed in the absence of upwelling. Postulated mechanisms for reduced larval alewife abundance in inshore areas during upwelling include mortality of larvae due to thermal shock, and offshore or alongshore movement, either actively by larvae and potential spawning adults, or passively by larvae.Key words: Alosa pseudoharengus larvae, distribution, abundance, Lake Michigan, upwelling

Fish Abundance and Distribution Near Three Heated Effluents to Lake Michigan

1982 ◽  
Vol 39 (2) ◽  
pp. 305-315 ◽  
Author(s):  
S. A. Spigarelli ◽  
R. M. Goldstein ◽  
W. Prepejchal ◽  
M. M. Thommes
Keyword(s):  
Power Plants ◽  
Lake Michigan ◽  
Fish Distribution ◽  
General Distribution ◽  
Mapping Technique ◽  
Alosa Pseudoharengus ◽  
Increasing Temperature ◽  
Abundance And Distribution ◽  
Distribution Of Fish ◽  
Reference Areas

A combined echo location–temperature mapping technique was used to determine the abundance and distribution of fish with depth and temperature in locally heated and unheated areas of Lake Michigan. Surveys were conducted between April and October at two adjacent power plants in the southern basin and at one plant in the northern basin of the lake. Fish densities in plume and reference areas differed seasonally. Densities typically differed by a factor of 2–4 although on one occasion plume area density was 90 times greater. Highest plume densities occurred during late spring when alewife (Alosa pseudoharengus) were spawning inshore. Consistently dense congregations of fish were found downstream of the interfaces between ambient shore-parallel currents and discharge flows. The general distribution of fish with depth was similar in all areas. Differences between plume and reference areas were related to the discharge type: at canal discharges fish tended to congregate inshore while at the offshore discharge they congregated in deeper zones. Fish also tended to occupy shallower depth strata in all plume areas. Positive correlation between fish density and increasing temperature was common at both plume and reference areas during all three seasons, but more frequent at plume areas. Temperatures selected by fish in plume areas were 1–3 °C higher than maximum ambient temperatures.Key words: fish distribution, thermal outfall, temperature, depth, discharge type, Lake Michigan

Early life history of alewife Alosa pseudoharengus in southwestern Lake Michigan

2015 ◽  
Vol 41 (2) ◽  
pp. 436-447 ◽  
Author(s):  
Michael J. Weber ◽  
Blake C. Ruebush ◽  
Sara M. Creque ◽  
Rebecca A. Redman ◽  
Sergiusz J. Czesny ◽  
...  
Keyword(s):  
Life History ◽  
Early Life ◽  
Lake Michigan ◽  
Early Life History ◽  
Alosa Pseudoharengus ◽  
History Of

An Energetics Model for Lake Trout, Salvelinus namaycush: Application to the Lake Michigan Population

1983 ◽  
Vol 40 (6) ◽  
pp. 681-698 ◽  
Author(s):  
Donald J. Stewart ◽  
David Weininger ◽  
Donald V. Rottiers ◽  
Thomas A. Edsall
Keyword(s):  
Lake Michigan ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
High Energy ◽  
Alosa Pseudoharengus ◽  
Fishing Mortality ◽  
Age Classes ◽  
Short Term ◽  
Conversion Efficiencies

An energetics model is implemented for lake trout, Salvelinus namaycush, and applied to the Lake Michigan population. It includes an egestion function allowing any proportional mix of fish and invertebrates in the diet, a growth model accounting for both ontogenetic and seasonal changes in energy-density of predator and prey, a model for typical in situ swimming speed, and reproductive energy losses due to gametes shed. Gross conversion efficiency of energy by lake trout over their life (21.8%) is about twice the efficiency of converting biomass to growth because they store large amounts of high-energy fats. Highest conversion efficiencies are obtained by relatively fast-growing individuals, and over half the annual energy assimilated by older age-classes may be shed as gametes. Sensitivity analysis indicates a general robustness of the model, especially for estimating consumption by fitting a known growth curve. Largest sensitivities were for the intercept and weight dependence coefficients of metabolism. Population biomass and associated predatory impact of a given cohort increase steadily for about 3.5 yr then decline steadily after fishing mortality becomes important in the fourth year in the lake. This slow response time precludes manipulation of lake trout stocking densities as a means to control short-term prey fluctuations. Predation by lake trout on alewife, Alosa pseudoharengus, has been increasing steadily since 1965 to about 8 400 t∙yr−1, and is projected to rise to almost 12 000 t∙yr−1 by 1990.

Adult and larval fish assemblages vary among small tributary mouths of Green Bay, Lake Michigan

2021 ◽  
Author(s):  
Amelia T McReynolds ◽  
Megan L. Hoff ◽  
Angelena A. Sikora ◽  
Cynthia I. Nau ◽  
Michael J. Pietraszek ◽  
...  
Keyword(s):  
Fish Assemblage ◽  
Lake Michigan ◽  
Fish Assemblages ◽  
Water Movement ◽  
Larval Fish ◽  
Spatial Dynamics ◽  
Spatial And Temporal Variation ◽  
Adult Fish ◽  
Green Bay ◽  
Small Tributary

Small tributaries of the Great Lakes serve as important habitat during critical life stages of many fish species, though temporal and spatial dynamics of the assemblage that uses these systems are seldom investigated. This study quantifies larval and adult fish assemblages captured by fyke net and light traps among small tributary mouths of Green Bay, Lake Michigan. Ten tributaries harbored a total of forty-five species representing seventeen families, with the most abundant including spottail shiner (Notropis hudsonius (Clinton 1824)) in adult assemblages and white sucker (Catostomus commersonii (Lacepède 1803)) in larval assemblages. Larval fish assemblage structures differed over five biweekly sampling events in May and June. Adult fish assemblage structures varied among tributaries but not among spring, summer, and fall samples. Larval and adult species assemblages at these rivermouths are likely influenced by hydrology, habitat structure, and species-specific ecology. Water movement may transport larvae into rivermouths, as larval assemblages were dominated by species that spawn in coastal habitats. Adult species richness varied with longitude, with the greatest diversity in tributaries on the west shore. This investigation of fish assemblages highlights the spatial and temporal variation that occurs in these systems and their role in shaping fish populations in Green Bay.

Fate of phosphorus from a point source in the Lake Michigan nearshore zone

2019 ◽  
Vol 45 (6) ◽  
pp. 1182-1196 ◽  
Author(s):  
Hector R. Bravo ◽  
Harvey Bootsma ◽  
Bahram Khazaei
Keyword(s):  
Point Source ◽  
Lake Michigan ◽  
Nearshore Zone

Studies of the Ground-dwelling Mammals of Eucalypt Forests in North-eastern New South Wales: the Species, their Abundance and Distribution

1997 ◽  
Vol 24 (1) ◽  
pp. 1 ◽  
Author(s):  
P. C. Catling ◽  
R. J. Burt
Keyword(s):  
Vulpes Vulpes ◽  
New South ◽  
New South Wales ◽  
Felis Catus ◽  
Widespread Distribution ◽  
South Wales ◽  
Significant Difference ◽  
North Eastern ◽  
Eucalypt Forests ◽  
Abundance And Distribution

The distribution and abundance of ground-dwelling mammals in the major vegetation alliances in the eucalypt forests within an area of c. 24000 km2 in north-eastern New South Wales were examined. Data for 33 species of mammal from 21 areas containing 30 vegetation alliances were collected. Four notable aspects of the data were the absence or low abundance of the introduced fox (Vulpes vulpes), the widespread distribution and abundance of the cat (Felis catus), the diversity and abundance of medium-sized native mammals and the diversity of small mammals. Although differences occurred between areas and alliances, there was no significant difference in the number of native and introduced species. The ground-dwelling mammals present in the eucalypt forests of north-eastern New South Wales were more diverse and in greater abundance than those found in forests of south-eastern New South Wales. However, some species, such as the spotted-tailed quoll (Dasyurus maculatus), appear to be in urgent need of protection and management if they are to persist.

Piscivority in a Land-Locked Alewife (Alosa pseudoharengus) Population

1980 ◽  
Vol 37 (8) ◽  
pp. 1314-1317 ◽  
Author(s):  
Christopher C. Kohler ◽  
John J. Ney
Keyword(s):  
Great Lakes ◽  
Larval Fish ◽  
Early Summer ◽  
Zooplankton Abundance ◽  
Alosa Pseudoharengus ◽  
Zooplankton Density ◽  
Forage Species ◽  
Dietary Component ◽  
Fish Ingestion ◽  
Precipitous Decline

Larval fish were a frequent dietary component of alewives (Alosa pseudoharengus) from Claytor Lake, Virginia, USA. Alewives consumed the young of four game and two forage species (maximum 26 mm total length (TL)). Alewife piscivority appeared to be at least partially nocturnal and was more prominent in littoral than in limnetic areas. Predator and prey lengths were positively correlated, although morphological limits on larval fish ingestion by alewives were not severe. Peak occurrence (40–70%, June 1978) of larval fish in alewife stomachs coincided with a precipitous decline in zooplankton density. Zooplankton abundance was higher in early summer 1979, when alewife piscivority was less common. Our findings support the hypothesis that alewife piscivority could have contributed to the collapse of Great Lakes resident fish populations following alewife establishment. Alewife piscivority should be considered in risk–benefit evaluations prior to introducing alewife as a pelagic forage species.Key words: alewife, Alosa pseudoharengus; feeding ecology, larval fish, Great Lakes fisheries, forage introductions

Sign in / Sign up

Export Citation Format

Share Document