Influence of Food Competition, Predation, and Cannibalism on Walleye (Stizostedion vitreum vitreum) and Sauger (S. canadense) Populations in Lake of the Woods, Minnesota

1976 ◽  
Vol 33 (9) ◽  
pp. 1946-1954 ◽  
Author(s):  
William A. Swenson ◽  
Lloyd L. Smith Jr.
Keyword(s):  
Body Weight ◽  
Food Consumption ◽  
Food Availability ◽  
Food Competition ◽  
Stizostedion Vitreum ◽  
Commercial Catch ◽  
Lake Of The Woods ◽  
Daily Food ◽  
Influence Of Food ◽  
Catch Statistics

Feeding relationships between walleye, Stizostedion vitreum vitreum, and sauger, Stizostedion canadense, in Lake of the Woods, Minnesota, were investigated. Effectiveness of food consumption estimates in measuring feeding interactions was defined. Differences in walleye and sauger distribution, food habits, and feeding strata reduced interactions. Walleye feeding rate varied from 0.5 to 4.1% of body weight per day and was limited by prey abundance during June and July. Higher August and September prey densities did not influence walleye food consumption. Daily food consumption of sauger varied from 0.5 to 3.5% of body weight independent of changes in food availability. Relationships between the number of prey consumed daily by walleye and sauger and the decline in abundance of prey species suggested that predation was important in controlling food availability, and was the major cause of food competition and its limiting effect on walleye growth.Analysis of commercial catch statistics suggested that factors other than predation influenced walleye survival. However, the relationship between the number of young-of-the-year walleye consumed and their abundance in the lake demonstrated predation by sauger may be important to walleye survival.

Food Consumption of Walleye (Stizostedion vitreum vitreum) and Sauger (S. canadense) in Relation to Food Availability and Physical Conditions in Lake of the Woods, Minnesota, Shagawa Lake, and Western Lake Superior

1977 ◽  
Vol 34 (10) ◽  
pp. 1643-1654 ◽  
Author(s):  
William A. Swenson
Keyword(s):  
Body Weight ◽  
Food Consumption ◽  
Yellow Perch ◽  
Prey Density ◽  
Lake Superior ◽  
Stizostedion Vitreum ◽  
Lake Of The Woods ◽  
Daily Food Consumption ◽  
Western Lake ◽  
Daily Food

Measurement of walleye (Stizostedion vitreum vitreum) daily food consumption rates and prey density in Lake of the Woods, Minnesota, Shagawa Lake, and western Lake Superior showed a general relationship exists between the two variables. Daily food consumption increased from 1 to 3% of body weight at prey densities up to 400 mg∙m−3. Abundance of age 0 yellow perch (Perca flavescens) in Lake of the Woods, Minnesota, and Shagawa Lake resulted in much higher prey densities and daily food consumption to 4% of body weight. In Lake Superior where walleye fed exclusively on rainbow smelt (Osmerus mordax), prey density did not exceed 300 mg ∙m−3 and daily food consumption averaged less than 2.5% of body weight.Hourly food consumption by walleye changed in response to variation in prey availability and light intensity. Night feeding predominated during July and August when walleye fed on pelagic age 0 yellow perch. Feeding appeared to be continuous or crepuscular during June and September when larger demersal prey fish or invertebrates were eaten. Food consumption declined when prey concentrated near aquatic macrophytes and under conditions of high light intensity. Walleye daily food consumption was not influenced by a change in temperature from 20 to 15 °C.Daily food consumption of Lake of the Woods, Minnesota sauger (Stizostedion canadense) averaged less than walleye and was influenced by wave activity and prey density. Demersal prey was utilized by sauger throughout the 24 h-day. Key words: Percidae, food consumption, behavior, feeding, walleye, Stizostedion vitreum vitreum, sauger, S. canadense, light

Effect of body weight and temperature on the maximum daily food consumption of Esox lucius

1994 ◽  
Vol 44 (1) ◽  
pp. 165-167 ◽  
Author(s):  
A. Salam ◽  
P. M. C. Davies
Keyword(s):  
Body Weight ◽  
Food Consumption ◽  
Esox Lucius ◽  
Daily Food Consumption ◽  
Daily Food

Review of Studies on Feeding of Aquatic Invertebrates Conducted at the Institute of Biology of Inland Waters, Academy of Science, USSR

1972 ◽  
Vol 29 (4) ◽  
pp. 363-383 ◽  
Author(s):  
A. V. Monakov
Keyword(s):  
Body Weight ◽  
Food Consumption ◽  
Aquatic Invertebrates ◽  
Food Concentration ◽  
Natural Food ◽  
High Concentration ◽  
Experimental Conditions ◽  
Daily Food Consumption ◽  
Daily Food ◽  
Very High

The main results obtained at the Borok Institute during the last decade are reviewed. Food and methods of feeding by various aquatic invertebrates (Rotatoria, Oligochaeta, Mollusca, Cladocera, Copepoda, Chironomidae larvae), daily food consumption, and assimilation of food have been investigated. Most invertebrates are omnivores although some species live on only one type of food. Daily food consumption changes with food concentration, temperature, and size of consumer. At 15–22 C and a concentration of food close to optimum, mean daily rations of most invertebrates studied usually range from 25 to 100% of body weight. Only in pulmonary Gastropoda and silt-eating Tubificidae does it greatly exceed body weight. In rare cases, at very high concentration of food unusual in nature, the so-called "extra feeding" may take place under experimental conditions. For most invertebrates feeding on natural food at optimum concentrations, index of assimilation varies widely, but rarely exceeds 50%. The assimilability of plant food was 45–55% in the majority of investigated species and appears to be considerably higher when animal food is used.

Food Intake and Body Weight in Rats With Daily Food-Availability Restrictions

1996 ◽  
Vol 60 (3) ◽  
pp. 791-794 ◽  
Author(s):  
E Krizova
Keyword(s):  
Body Weight ◽  
Food Intake ◽  
Food Availability ◽  
Daily Food

Food intake and body weight in rats with daily food-availability restrictions

1996 ◽  
Vol 60 (3) ◽  
pp. 791-794 ◽  
Author(s):  
Eva Křížova ◽  
Vladimir S Imek ◽  
Maria Abelenda ◽  
Marisa Puerta
Keyword(s):  
Body Weight ◽  
Food Intake ◽  
Food Availability ◽  
Daily Food

Protective Effects of Fagonia cretica L. Extract in Cafeteria Diet Induced Obesity in Wistar Rats

2020 ◽  
Vol 20 (3) ◽  
pp. 185
Author(s):  
Divyang Patel ◽  
Vimal Kumar
Keyword(s):  
Body Weight ◽  
Food Consumption ◽  
Wistar Rats ◽  
Cafeteria Diet ◽  
Control Group ◽  
Protective Effects ◽  
Methanolic Extracts ◽  
Diet Induced Obesity ◽  
Daily Food ◽  
Obese Control

Obesity is one of the major life style disorders which may lead to undesirable effects on cholesterol, triglycerides, blood pressure and insulin resistance and eventually increases the risk of various adverse conditions like ischemic heart disease, stroke, coronary artery disease &amp; type 2 diabetes. The present investigation was undertaken to explore protective effects of aerial parts of <em>Fagonia cretica</em> L. extract in cafeteria diet induced obesity in Wistar rats. Female Wistar rats were provided with cafeteria diet (CD) for the period of 10 weeks to induce obesity. <em>Fagonia cretica</em> L. methanolic extracts (200 &amp; 400 mg/kg) &amp; standard drug orlistat (30 mg/kg) were administered for last 6 weeks along with the continuation of CD. Various primary metabolic indicators of obesity like daily food consumption, body weight, lipid profile, fecal fat content &amp; fat pads were studied. Administration of methanolic extract of <em>Fagonia cretica</em> L. significantly stopped increase in daily food consumption &amp; body weight gain as compared to obese control group. Improvement in lipid profile was also observed in the all treatment groups rats as compared to obese control group rats. Obtained results validate that supplementation of <em>Fagonia cretica</em> L. methanolic extracts in obese rats resulted in significant protection against various indicators of obesity.

EFFECT OF HYPERVITAMINOSIS A ON INTESTINAL LIPIDS OF RATS

1967 ◽  
Vol 45 (9) ◽  
pp. 1413-1418 ◽  
Author(s):  
U. K. Misra
Keyword(s):  
Body Weight ◽  
Phosphatidic Acid ◽  
Food Consumption ◽  
Silicic Acid ◽  
Silicic Acid Column ◽  
Total Lipids ◽  
Hypervitaminosis A ◽  
Daily Food ◽  
Significant Difference ◽  
And Control

The effect of intramuscular administration of retinol (100,000 I.U. daily for 13 days) on intestinal lipids of young rats has been studied. The administration of toxic doses of retinol significantly increased the total lipids of intestine as compared with the control. A significant increase in intestinal monoglycerides, and in phosphatidic acid and polyglycerol phosphatide (present in the phospholipid fraction eluted from a silicic acid column with 5% methanolic chloroform) was observed in the hypervitaminotic A rats. There was no significant difference in the daily food consumption and body weight between the hypervitaminotic A and control rats at the time of sacrifice.

19. Patterns of Body Weight Changes and Fluid/Food Consumption in a Hot Working Environment

2000 ◽  
Author(s):  
S. Rose ◽  
J. Moore ◽  
J. Congleton
Keyword(s):  
Body Weight ◽  
Food Consumption ◽  
Hot Working ◽  
Working Environment ◽  
Weight Changes ◽  
Body Weight Changes
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