Food of Killifish and White Perch in Relation to Supply

1947 ◽  
Vol 7a (1) ◽  
pp. 22-34 ◽  
Author(s):  
M. W. Smith
Keyword(s):  
Nova Scotia ◽  
White Perch ◽  
Dry Weight ◽  
Fish Population ◽  
Bottom Fauna ◽  
Small Fish ◽  
Morone Americana ◽  
Fundulus Diaphanus

Killifish (Fundulus diaphanus) in Tedford lake, Nova Scotia, selected bottom microcrustaceans, Hyalella, chironomids and Chaoborus, but not Amnicola commensurately with its abundance. They ignored available pelagic microcrustaceans. White perch (Morone americana) took pelagic microcrustaceans, Hyalella, odonates, chironomids, Chaoborus, insect imagines, and small fish, but avoided mollusks. With increase in length, even within narrow limits, they selected larger organisms. About 70 per cent by count and 10 per cent by dry weight of the macroscopic bottom fauna consisted of species eaten by both fish. About 20 per cent by count of the fish population was available to the perch. Other macroscopic bottom organisms and tadpoles were too large or secretive to be available. Available and acceptable bottom organisms were effectively utilized by both fish. Perch cropped the pelagic microcrustaceans poorly, but the available fish effectively.

Behaviour, Energetics, and Associated Mortality of Young-of-the-Year White Perch (Morone americana) and Yellow Perch (Perca flavescens) under Simulated Winter Conditions

1991 ◽  
Vol 48 (4) ◽  
pp. 672-680 ◽  
Author(s):  
Timothy B. Johnson ◽  
David O. Evans
Keyword(s):  
Yellow Perch ◽  
White Perch ◽  
Perca Flavescens ◽  
Direct Consequence ◽  
Dry Weight ◽  
Routine Metabolic Rate ◽  
Winter Period ◽  
Small Fish ◽  
Morone Americana ◽  
Winter Conditions

After 150 d of simulated winter conditions, 71.2% of the white perch (Morone americana) had died at 2.5 °C, while only 11.1% had died at 4.0 °C. For yellow perch (Perca flavescens), 0.8% had died at 2.5 °C, while 17.7% had died at 4.0 °C. For both species, small fish died first. Multiple regression models relating overwinter mortality versus fall total length and winter duration predict 3.3 times greater mortality for white perch versus similar sized yellow perch at winter temperature regimes typical of the Great Lakes region. In laboratory tanks, white perch remained active throughout the winter period, while yellow perch sought cover and rested on or near the bottom of the experimental tanks. As a direct consequence, yellow perch had a lower routine metabolic rate and consumed body energy more gradually than white perch. During their inactive wintering period at 4.0 °C, yellow perch consumed 25.8% less oxygen than white perch. Actual measurements of dry weight loss indicated that yellow perch in the experimental tanks at 2.5 °C consumed 24.6% less dry weight than similar sized white perch. These differences in overwinter behaviour, metabolism, and survival appear to be adequate to account for observed differences in survival of these species in the wild.

Limnological Features of Cedar Lake, Manitoba

1965 ◽  
Vol 22 (5) ◽  
pp. 1123-1136
Author(s):  
D. W. Webb
Keyword(s):  
Thermal Stratification ◽  
River System ◽  
Dry Weight ◽  
Total Dissolved Solids ◽  
Mean Value ◽  
Total Alkalinity ◽  
Bottom Fauna ◽  
Chemical Factors ◽  
Main Basin ◽  
Physical And Chemical

Cedar Lake, largest lake in the Saskatchewan River system, was studied from June 14 until August 31, 1962. Twenty stations, located in the main basin of the lake, were examined during six sampling periods. These stations were located along five transects, at depths of 1.5, 3, 6, and 9 m. No thermal stratification occurred and the oxygen concentration never fell below 78% of air saturation. Total alkalinity and total dissolved solids averaged above 65 and 270 ppm, respectively.The average number of bottom organisms increased with depth, with the bulk of these being made up of spheariid clams, mayflies, chironomids, and gastropods. The number of genera also increased with depth. The standing crops determined for the six sampling periods ranged from 17.7 to 33.2 lb/acre (dry weight), with a mean value of 23.4 lb/acre. Correlations between the physical and chemical factors and the distribution of bottom fauna are examined and it is felt that the bottom type is the major factor affecting the distribution and abundance of bottom organisms in Cedar Lake. On the basis of the physical and chemical criteria, Cedar Lake may be classified as eutrophic.

Conserved and Variant Molecular and Functional Features of Multiple Egg Yolk Precursor Proteins (Vitellogenins) in White Perch (Morone americana) and other Teleosts

2008 ◽  
Vol 11 (2) ◽  
pp. 169-187 ◽  
Author(s):  
Benjamin J. Reading ◽  
Naoshi Hiramatsu ◽  
Sayumi Sawaguchi ◽  
Takahiro Matsubara ◽  
Akihiko Hara ◽  
...  
Keyword(s):  
White Perch ◽  
Egg Yolk ◽  
Morone Americana ◽  
Precursor Proteins ◽  
Functional Features

Interannual Mixed Function Oxidase (MFO) Activity in Winter Flounder (Pleuronectes americanus) from a Coal Tar Contaminated Estuary

1994 ◽  
Vol 51 (6) ◽  
pp. 1368-1375 ◽  
Author(s):  
V. Vignier ◽  
J. H. Vandermeulen ◽  
J. Singh ◽  
D. Mossman
Keyword(s):  
Nova Scotia ◽  
Coal Tar ◽  
Dry Weight ◽  
Erod Activity ◽  
Winter Flounder ◽  
Mixed Function Oxidase ◽  
Pleuronectes Americanus ◽  
Cyt B ◽  
Sydney Estuary ◽  
Pyrene Hydroxylase

7-Ethoxyresorufin-O-deethylase (EROD), benzo[a]pyrene hydroxylase (BaPH), and cytochromes P-450 (cyt-P450) and b5 (cyt-b5) varied annually in winter flounder (Pleuronectes americanus) collected in August of 1987, 1988, and 1989 from a coal tar contaminated estuary (Sydney, Nova Scotia, Canada). For August 1989, with fish available from all estuary areas, these indices correlated strongly with a spatial (along estuary) gradient in PAH in bottom sediments (7.19 ± 6.59–191 ± 184 μg g dry weight−1). Mean EROD activities in flounder near the coal tar source were up to seven times those in other estuary areas and paralleled sediment PAH loadings; however, standard deviations were high. Correlations for all MFO indices and sediment PAH were obtained in female flounder (P < 0.01: EROD, cyt-b5, cyt-P450; P < 0.02: BaPH). For male flounder the trend was similar, but only cyt-P450 correlated with sediment PAH (P < 0.017). BaPH activity was highest near the coal tar source but was more variable and less sensitive to pollutant levels than EROD activity. Somatic indices in fish from Sydney estuary and St. George's Bay were similar. Winter flounder are vulnerable to PAH-induced MFO activities from coal tar contaminated sediments, but MFO induction does not occur equally in all fish; single-season or single-year data must be interpreted with caution.

Lethal and sublethal exposure and recovery effects of ozone-produced oxidants on adult white perch (Morone americana Gmelin)

1983 ◽  
Vol 17 (2) ◽  
pp. 205-213 ◽  
Author(s):  
Leonard B. Richardson ◽  
Dennis T. Burton ◽  
Ronald M. Block ◽  
Ann M. Stavola
Keyword(s):  
White Perch ◽  
Morone Americana ◽  
Sublethal Exposure

Effect of acute and chronic temperature transition on enzymes of cardiac metabolism in white perch (Morone americana), yellow perch (Perca flavescens), and smallmouth bass (Micropterus dolomieui)

1991 ◽  
Vol 69 (1) ◽  
pp. 258-262 ◽  
Author(s):  
Dawn H. Sephton ◽  
William R. Driedzic
Keyword(s):  
Yellow Perch ◽  
Citrate Synthase ◽  
White Perch ◽  
Perca Flavescens ◽  
Smallmouth Bass ◽  
Transferase Activity ◽  
Morone Americana ◽  
Coa Transferase ◽  
Micropterus Dolomieui ◽  
The Impact

White perch (Morone americana), yellow perch (Perca flavescens), and smallmouth bass (Micropterus dolomieui) were acclimated to 5 and 20 °C. There was an increase in ventricle mass relative to body mass in smallmouth bass only following acclimation to 5° C. Maximal in vitro activities of hexokinase, citrate synthase, carnitine acyl CoA transferase (with palmitoyl CoA, palmitoleoyl CoA, and oleoyl CoA as substrates), and total ATPase were assessed in crude heart homogenates. Tissues removed from warm-acclimated animals were tested at 20 and 5 °C; tissues removed from cold-acclimated animals were assessed at 5 °C. Acute temperature transitions were associated with decreases in the activities of hexokinase (Q10 ≈ 1.8), citrate synthase (Q10 ≈ 1.4), and ATPase (Q10 ≈ 1.7). The impact of temperature on carnitine acyl CoA transferases was generally less severe. This suggests that maximal fatty acid oxidation is conserved better than glucose oxidation during a warm to cold transition. Maximal enzyme activities were generally unaffected by the acclimation regime, with the exception of that of carnitine acyl CoA transferase in white perch heart. The substantial increase in carnitine acyl CoA transferase activity when unsaturated CoA derivatives were provided as substrate suggests an increased capacity to oxidize unsaturated fatty acids at low temperature following an acclimation period. Attempts to sustantiate this contention by offering labelled oleic acid to ventricle sheets were thwarted by a high rate of incorporation into the total lipid pool.

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