scholarly journals Apparent Size as the Determinant of Prey Selection by Bluegill Sunfish (Lepomis Macrochirus)

Ecology ◽  
1976 ◽  
Vol 57 (6) ◽  
pp. 1304-1310 ◽  
Author(s):  
W. John O'Brien ◽  
Norman A. Slade ◽  
Gary L. Vinyard
Keyword(s):  
Prey Selection ◽  
Lepomis Macrochirus ◽  
Apparent Size ◽  
Bluegill Sunfish

scholarly journals Boldness and behavioral syndromes in the bluegill sunfish, Lepomis macrochirus

2009 ◽  
Vol 20 (2) ◽  
pp. 231-237 ◽  
Author(s):  
Alexander D.M. Wilson ◽  
Jean-Guy J. Godin
Keyword(s):  
Lepomis Macrochirus ◽  
Behavioral Syndromes ◽  
Bluegill Sunfish

scholarly journals Match–Mismatch Regulation for Bluegill and Yellow Perch Larvae and Their Prey in Sandhill Lakes

2010 ◽  
Vol 1 (2) ◽  
pp. 73-85 ◽  
Author(s):  
Jeffrey C. Jolley ◽  
David W. Willis ◽  
Richard S. Holland
Keyword(s):  
Yellow Perch ◽  
Prey Selection ◽  
Larval Fish ◽  
Lepomis Macrochirus ◽  
Perca Flavescens ◽  
Stomach Contents ◽  
Zooplankton Abundance ◽  
Growth And Survival ◽  
Fish Recruitment ◽  
Newly Hatched Larvae

Abstract Food availability may regulate fish recruitment, both directly and indirectly. The availability of zooplankton, especially to newly hatched larvae, is thought to be crucial to their early growth and survival. We examined stomach contents of larval bluegill Lepomis macrochirus and yellow perch Perca flavescens in Pelican Lake and Cameron Lake, Nebraska, in 2004 and 2005. We also determined zooplankton availability and calculated prey selection using Chesson's α. In addition, we investigated potential match–mismatch regulation of recruitment from 2004 to 2008. Bluegill positively selected copepod nauplii and Bosmina spp., and yellow perch often selected copepods. Abundant zooplankton populations were available for consumption. Matches of both larval bluegill and yellow perch abundance to zooplankton abundance were detected in all years; exact matches were common. Mismatches in predator and prey production were not observed. Predation by age-0 yellow perch on age-0 bluegill was not observed, even though yellow perch hatched 2 mo prior to bluegill. Given that zooplankton were abundant and well-timed to larval fish relative abundance over the time span of this study, the match–mismatch hypothesis alone may not fully account for observed recruitment variability in these populations. Environmental conditions may also affect recruitment and warrant further investigation.

Effect of water temperature on stomach evacuation rates, and estimation of daily food intake of bluegill sunfish (Lepomis macrochirus Rafinesque)

1990 ◽  
Vol 68 (3) ◽  
pp. 591-595 ◽  
Author(s):  
D. J. Booth
Keyword(s):  
Food Intake ◽  
Water Temperature ◽  
Field Experiments ◽  
Lepomis Macrochirus ◽  
Stomach Contents ◽  
Bluegill Sunfish ◽  
Field Methods ◽  
Daily Food Intake ◽  
Evacuation Rate ◽  
Daily Food

Field experiments were conducted over the summer of 1983 to determine food-evacuation rate and measure stomach fullness of bluegill sunfish (Lepomis macrochirus). A combination of these data gave estimates of daily food intake of fish. Fish were captured and held in large holding pens in Lake Opinicon, Ontario, Canada, and periodically subsampled over 24 h to monitor changes in mean weight of stomach contents. Stomach-evacuation rates obtained in this way increased significantly with water temperature over the range 10–25 °C. However, variation in stomach-evacuation rate was considerable, reducing the utility of water temperature as a predictor of stomach-evacuation rate. It is suggested that the simple field methods employed here to estimate stomach evacuation and food intake are more useful in the estimation of daily ration than the more commonly employed laboratory-based methods.

Locomotor hyperactivity induced in the bluegill sunfish, Lepomis macrochirus, by sublethal concentrations of DDT

1977 ◽  
Vol 55 (7) ◽  
pp. 1077-1081 ◽  
Author(s):  
Erik G. Ellgaard ◽  
J. Coller Ochsner ◽  
J. Keith Cox
Keyword(s):  
Locomotor Activity ◽  
Tap Water ◽  
Lepomis Macrochirus ◽  
Quantitative Description ◽  
Control Fish ◽  
Bluegill Sunfish ◽  
Locomotor Hyperactivity ◽  
Sublethal Concentrations

A quantitative description of the effects of sublethal concentrations of DDT on the locomotor activity of the bluegill sunfish, Lepomis macrochirus, is presented. DDT-elicited hyperactive locomotor responses at all the concentrations examined (0.008, 0.01, 0.02, 0.04, 0.06, 0.08, 0.1, and 0.2 parts per billion (ppb)) and the degree of such responses were concentration dependent. Maximal effects at each concentration were observed within 8 days after addition of DDT to the environment. At their maxima, fish at 0.008 ppb were 1.3 times as active as control fish, whereas fish at 0.2 ppb were 3.0 times as active as controls. The effects of DDT on locomotor activity were not reversed even after the fish were transferred back into tap water for 2 weeks.

Nitrogen Excretion and Protein Consumption of the Bluegill Sunfish (Lepomis macrochirus)

1971 ◽  
Vol 28 (3) ◽  
pp. 449-451 ◽  
Author(s):  
J. Savitz
Keyword(s):  
Mathematical Description ◽  
Lepomis Macrochirus ◽  
Specific Dynamic Action ◽  
Nitrogen Excretion ◽  
Bluegill Sunfish ◽  
Protein Consumption ◽  
Dynamic Action ◽  
Excretion Rates

Nitrogen excretion rates increase with an increase in protein consumption levels. A mathematical description of this relation was formulated from the data. Estimates of the effect of specific dynamic action on nitrogen excretion were also calculated.

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