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

Hudson River Fishes and their Environment

2006 ◽  
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Near Field ◽  
Hudson River ◽  
Pelagic Fish ◽  
Fish Abundance ◽  
Fish Distribution ◽  
Fish Density ◽  
Negative Effects ◽  
Abundance And Distribution

<em>Abstract.</em>—Pelagic fish abundance and distribution was estimated acoustically at Bowline and Indian Point power plants on the Hudson River, New York, during July, August, and September 1996, in a study designed to determine size-specific spatial and temporal fish abundance and distribution with respect to environmental variables (i.e., photoperiod, depth strata, field). August yielded the greatest (<EM>P </EM>< 0.05) mean density of fish at both power plants. Fish were concentrated in Bowline’s near-field (lagoon) region, thus increasing the potential for deleterious impingement and entrainment effects there. For all size classes, mean fish density was greatest during darkness at both power plants. Generally, the two power plants exhibited similar trends in mean fish abundance with respect to water depth and photoperiod. During July and August mean fish density was significantly higher between 1.5 and 4.5 m (depth strata one) of depth at both power plants. Bowline’s mean fish density was greater under near-field, shallow depth (depth strata one) darkness during July and August. Bowline’s isolated and bathymetrically complex near-field lagoon concentrated pelagic fish compared to the river proper. Hydroacoustics were useful in providing a detailed map of fish distribution relative to each power plant over the course of a few days each month. Hydroacoustic monitoring could mitigate negative effects to pelagic fish at existing and proposed power plants, through sighting of power plant water intake structures or by providing a biological basis for modified production cycles.

scholarly journals The Spatial Variation of Acoustic Water Column Data and Its Relationship with Reef-Associated Fish Recorded by Baited Remote Underwater Stereo-Videos off the Western Australia Coast

2022 ◽  
Vol 10 (1) ◽  
pp. 52
Author(s):  
Marcela Montserrat Landero Figueroa ◽  
Miles J. G. Parsons ◽  
Benjamin J. Saunders ◽  
Iain M. Parnum
Keyword(s):  
Species Abundance ◽  
Fish Distribution ◽  
Spatially Explicit ◽  
Effective Management ◽  
Small Areas ◽  
Marine Park ◽  
Coral Fish ◽  
Abundance And Distribution ◽  
Distribution Of Fish ◽  
Potential Use

Spatially explicit information on coral fish species abundance and distribution is required for effective management. Nonextractive techniques, including echosounders and video census, can be particularly useful in marine reserves where the use of extractive methods is restricted. This study aimed to investigate the possibility of combining echosounders and baited remote underwater stereo-videos (stereo-BRUVs) in providing more holistic information on the distribution of demersal and semidemersal reef-associated fish. The spatial distribution of fish biomass was assessed using both methods in two small areas, one in Cockburn Sound (CS), a temperate body of water, and the other in the tropical waters of the Ningaloo Marine Park (NMP). The results showed high correlations between the acoustic and stereo-BRUV data in CS, suggesting the potential use of both for a better estimation of biomass in the area. The results for the NMP showed weaker correlations between the two datasets and highlighted the high variability of the system. Further studies are required, but our initial findings suggest a potential benefit of combining both techniques in the reef-associated fish distribution assessment.

scholarly journals Distribution of Fish Target Strength in Malang Rapat Seawater of Bintan Island, Kepulauan Riau Province

2020 ◽  
Vol 4 (1) ◽  
pp. 265-270
Author(s):  
Andi Yaodi Nurani Yamin ◽  
Henry M Manik ◽  
Sri Pujiyati
Keyword(s):  
Coastal Communities ◽  
Fish Distribution ◽  
Target Strength ◽  
Fish Length ◽  
Primary Sector ◽  
Strength Based ◽  
Public Revenue ◽  
Abundance And Distribution ◽  
Distribution Of Fish ◽  
Distribution Behavior

Malang Rapat is an area located in east Bintan Island. As a part of coastal communities, fisheries were the primary sector for public revenue in Malang Rapat. A qualified method is needed to determine the abundance and distribution of fish were required. Hydroacoustic technology is one method to solve this problem. This research aimed was to determine the value of fish target strength and to determine the pattern of fish distribution behavior in Malang Rapat, Kepulauan Riau Province, on September 23 and 24, 2016, using scientific echosounder Simrad EK15. The result indicated that fish target strength in Malang Rapat was -60 dB to -42 dB. This value was useful to estimate the length of fish ranged from 3 cm to 31 cm. The highest mean target strength based on depth was -48 dB at 10 m in the daytime and -52 dB at 3 m in the nighttime. The abundance of fish was found at night, precisely 3 meters from the surface of the water. The highest frequency appearance target strength range from -60 dB to -58 dB with 3.94 to 4.95 cm estimated fish length.

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

Thermal Habitat Shifts by Fishes at the Thermocline in Lake Michigan

1982 ◽  
Vol 39 (7) ◽  
pp. 1046-1050 ◽  
Author(s):  
Larry B. Crowder ◽  
John J. Magnuson
Keyword(s):  
Lake Michigan ◽  
Abundant Species ◽  
Fish Distribution ◽  
Niche Shift ◽  
Alosa Pseudoharengus ◽  
Thermal Habitat ◽  
Thermal Distribution ◽  
Lake Bottom ◽  
Competition For Food ◽  
Coregonus Hoyi

We documented thermal habitats of Lake Michigan fishes by bottom trawling at the intersection of the thermocline and the lake bottom near Grand Haven, Michigan. Fish distribution by temperature strata was surveyed during day and night on September 7–13, 1977, and repeated on August 27–September 1, 1979. In the interim, bloaters (Coregonus hoyi) had increased substantially. By comparing these two periods, we suggest that bloaters dramatically altered the thermal distribution of adult alewife (Alosa pseudoharengus). While comprising less than 1% of the trawl catch in 1977, bloaters comprised 42% in 1979. Bloaters were the most-abundant species from 5 to 16 °C in 1979. Adult alewife shifted their thermal distribution from 11 to 16 °C in 1977 to 4 to 8 °C in 1979. This shift is interpreted in terms of competition for food and thermal habitat, or predation by salmonids. The idea that the altered thermal distribution of alewife results from competitive interactions with bloaters is favored by existing data.Key words: competition, fishes, habitat partitioning, Lake Michigan, niche shift, predation, salmonids, temperature, thermocline

Preliminary observations on abundance and distribution of fish fauna in a canyon of the Bay of Biscay (ICES Division 8c)

2021 ◽  
pp. 1-10
Author(s):  
G. Diez ◽  
L. Arregi ◽  
M. Basterretxea ◽  
E. Cuende ◽  
I. Oyarzabal
Keyword(s):  
Deep Sea ◽  
Basque Country ◽  
Fish Fauna ◽  
Fishing Effort ◽  
Fishing Gear ◽  
Clear Trend ◽  
Depth Ranges ◽  
Abundance And Distribution ◽  
Sea Fish ◽  
Distribution Of Fish

Abstract The changes in abundance and biodiversity of deep-sea fish fauna are described based on an annual deep-water longline survey with data collected during the period 2015–2019 in the Basque Country continental Slope (ICES Division 8c). The sampling scheme included hauls in four 400 m strata, from 650–2250 m deep. The DST sensors installed in the main line have allowed us to set an accurate soak time for each haul, and they were used to calculate fishing effort and CPUE by haul. The catchability of the fishing gear indicated that 15% of the total hooks deployed in the five-year period were able to fish, and that the bottom longline was very effective in fishing a wide number of different species in all depth ranges. The fishing gear caught 14 different species of sharks (13 deepwater and one pelagic), two chimaeras and nine teleosts. The abundance and biomass registered on the hooks attached to the bottom were between three and four times higher than in the floating sections, and the highest CPUE and biomass were recorded between 1051–1450 m, from 2015 to 2017, and in the 1451–1850 m strata, but they do not show any clear trend throughout the five years of the series.

scholarly journals Fish Ecology of the Alto Madre de Dios River Basin (Peru): Notes on Electrofishing Surveys, Elevation, Palm Swamp and Headwater Fishes

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1038
Author(s):  
Ibon Tobes ◽  
Adrián Ramos-Merchante ◽  
Julio Araujo-Flores ◽  
Andrea Pino-del-Carpio ◽  
Hernán Ortega ◽  
...  
Keyword(s):  
Environmental Variables ◽  
Biosphere Reserve ◽  
Fish Distribution ◽  
Fish Diversity ◽  
Fish Ecology ◽  
Aquatic Habitats ◽  
Madre De Dios ◽  
Distribution Of Fish ◽  
Important Shift ◽  
Electric Fishing

Our study analyzes the distribution of fish communities related to the environmental variables of the Alto Madre de Dios River, an Andean-Amazon watershed of southern Peru, between 300 and 2811 m a.s.l. within the Manu Biosphere Reserve. We provide new ecological and diversity data on fishes for these poorly studied rivers and new data for palm swamp habitats. With electric fishing techniques, we collected a total of 1934 fish specimens belonging to 78 species, 42 genera and 15 families. To assess main patterns of diversity we combined SIMPER and ANOSIM with canonical correspondence analysis to obtain an overview of the community structure of fish and their distribution related to aquatic habitats. Our results show an important shift on fish diversity at 700 m a.s.l. separating headwater and middle-lowland communities. Electrofishing was a hindrance due to the depth, flow and low conductivity of the rivers, but also allowed us to capture fish not observed with other techniques. We also compared the use of elevation with slope as an alternative variable for statistical analysis. Our results show that slope offers a solid and equivalent explanation for fish distribution variability, avoids redundance, and instead of giving geographical data offers ecologically solid information.

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.

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