Transmission of Paratenic Leptorhynchoides thecatus (Acanthocephala) from Green Sunfish (Lepomis cyanellus) to Largemouth Bass (Micropterus salmoides)

2009 ◽  
Vol 76 (2) ◽  
pp. 290-292 ◽  
Author(s):  
Dennis J. Richardson ◽  
Kristen E. Richardson
Keyword(s):  
Largemouth Bass ◽  
Micropterus Salmoides ◽  
Lepomis Cyanellus ◽  
Green Sunfish ◽  
Leptorhynchoides Thecatus

An Investigation into Fish Escapement from a Small Impoundment through a Pipe Spillway and Implications for Predatory Impacts on Small Stream Fishes

2008 ◽  
Vol 42 (2008) ◽  
pp. 7-10
Author(s):  
Scott C. Williams
Keyword(s):  
Largemouth Bass ◽  
Micropterus Salmoides ◽  
Lepomis Macrochirus ◽  
Predatory Fish ◽  
Stream Fishes ◽  
Lepomis Cyanellus ◽  
Small Stream ◽  
Endangered Fish ◽  
Flow Through ◽  
Green Sunfish

Escape of predatory fish from impoundments and their impact on native stream fishes, especially threatened and endangered fish, are concerns of fishery managers. This investigation was designed to identify if fish, especially predatory fish, would escape from an impoundment with a surface withdrawal spillway pipe, and enter a stream. From March 16, 2005 through June 2, 2006, all discharge from the impoundment was forced to flow through a steel cage constructed of one-half inch steel mesh, which trapped escaping fish consisting of 37 largemouth bass Micropterus salmoides, 141 bluegill Lepomis macrochirus, and 197 green sunfish Lepomis cyanellus. The average sizes of largemouth bass, bluegill and green sunfish caught were 3.9 inches (range 2.5 to 10.5 inches), 1.4 inches (range 0.75 to 2.5 inches), and 2.2 inches (range 1.3 to 3.3 inches), respectively. Most of the fish escapement occurred during the months of April, May, and September when discharge was highest. Thus fish can readily escape through a surface withdrawal spillway pipe during periods of discharge.

Daily Rings in Otoliths of Three Species of Lepomis and Tilapia mossambica

1977 ◽  
Vol 34 (3) ◽  
pp. 332-340 ◽  
Author(s):  
Bruce D. Taubert ◽  
Daniel W. Coble
Keyword(s):  
Calcium Carbonate ◽  
Largemouth Bass ◽  
Micropterus Salmoides ◽  
Lepomis Gibbosus ◽  
Dark Cycle ◽  
Winter Conditions ◽  
Tilapia Mossambica ◽  
Daily Ring ◽  
Green Sunfish ◽  
Fish Otoliths

Daily rings formed on otoliths of known-age, laboratory-raised pumpkinseed (Lepomis gibbosus), green sunflsh (L. cyanellus), bluegill (L. macrochirus), and mozambique mouthbrooder (Tilapia mossambica) for at least 176, 170, 125, and 60 days, respectively. Subdaily rings found in young laboratory and wild fish were easily distinguished from daily rings. Width of daily rings on otoliths of green sunfish was linearly related to daily increase in length of fish, but the number of rings was a product of age of fish only, not length of fish or otolith radius. Growth and daily ring formation on otoliths in wild bluegill and largemouth bass (Micropterus salmoides) appeared to be similar to those in laboratory-raised fish. Otoliths of green sunfish held under simulated winter conditions ceased to produce daily rings, but did form an annulus. Two kinds of otolith tissue were present in most of the larger laboratory fish and wild bluegill but were not observed in wild largemouth bass. The first type, present in all areas of the otolith except the extreme posterior end, was translucent and had well-defined daily rings. The second type, present only in the posterior end, was opaque and had poorly etched daily rings that were difficult to discern. Both tissues were calcium carbonate in the aragonite form. Daily rings were found on otoliths offish held at constant temperature. Results of experiments with young mouthbrooders held under various light–dark and feeding cycles suggested that a 24-h light–dark cycle that entrained an internal, diurnal clock was required for daily ring production.

Establishment, survival, site selection and development ofLeptorhynchoides thecatusin largemouth bass,Micropterus salmoides

Parasitology ◽  
1993 ◽  
Vol 106 (5) ◽  
pp. 495-501 ◽  
Author(s):  
C. C. Leadabrand ◽  
B. B. Nickol
Keyword(s):  
Largemouth Bass ◽  
Site Selection ◽  
Post Infection ◽  
Alimentary Tract ◽  
Micropterus Salmoides ◽  
Class Numbers ◽  
Intensity Of Infection ◽  
Pyloric Caeca ◽  
Stage Of Development ◽  
Leptorhynchoides Thecatus

SUMMARYEstablishment, survival and distribution ofLeptorhynchoides thecatus(Acanthocephala) were investigated in largemouth bass,Micropterus salmoides, fed 10, 25, or 40 cystacanths and examined at 1, 3 or 5 weeks post-infection. Worms established widely in the alimentary tracts of bass but by 5 weeks post-infection had localized in the pyloric caeca and intercaecal region. Other individuals moved to parenteral sites where they remained immature, though viable. In the 10- and 25-level exposures, establishment and survivorship in the alimentary tract were roughly proportional to the dose of cystacanths. After 1 week post-infection in the 40-level exposure class, numbers of worms in the alimentary tract decreased significantly and parenteral occurrence increased significantly. Total survival ofL. thecatusappeared to be density-independent. Maturation of worms was retarded temporarily as intensity of infection increased, but by 5 weeks post-infection worms from all doses were at roughly the same stage of development within sex. The caeca and intercaecal area apparently did not differ in their suitability for maturation.

Availability of caecal habitat as a density-dependent limit on survivorship ofLeptorhynchoides thecatusin green sunfish,Lepomis cyanellus

Parasitology ◽  
1989 ◽  
Vol 98 (3) ◽  
pp. 447-450 ◽  
Author(s):  
Julie A. Ewald ◽  
B. B. Nickol
Keyword(s):  
Post Infection ◽  
Alimentary Tract ◽  
The Other ◽  
Anterior Portion ◽  
Lepomis Cyanellus ◽  
Significant Difference ◽  
The Mean ◽  
Green Sunfish ◽  
The Relationship ◽  
Leptorhynchoides Thecatus

SUMMARYDistribution ofLeptorhynchoides thecatus(Acanthocephala: Rhadinorhynchidae) among the pyloric caeca and the relationship between site and rate of maturation were studied in laboratory infectons of 10, 25 and 40 cystacanths fed to green sunfish,Lepomis cyanellus. After 1 week fish fed at each intensity had significantly different numbers of worms. By the 3rd week post-infection, parasites disappeared from the anterior portion of the intestine. At this time the mean numbers of worms recovered from 25 and 40-cystacanth infections were not significantly different. At the end of the 1st week, the area where caeca join the alimentary tract (between caecal area) and caeca numbered 6 and 7 contained significantly more worms than the other sites. By the 3rd week post-infection only caecum 7 contained significantly more worms, and at 5 weeks there was no significant difference between the number of worms present in any caecum or the between caecal area. Initially worms in the more intense infections matured more slowly, but by the 3rd week post-infection there was no significant difference in the states of maturity. The rate of maturation was not related to the site occupied.

Mortality, Hematocrit, Osmolality, Electrolyte Regulation, and Fat Depletion of Young-of-the-Year Freshwater Fishes under Simulated Winter Conditions

1980 ◽  
Vol 37 (2) ◽  
pp. 225-232 ◽  
Author(s):  
Michael L. Toneys ◽  
Daniel W. Coble
Keyword(s):  
Largemouth Bass ◽  
Brook Trout ◽  
Yellow Perch ◽  
Micropterus Salmoides ◽  
Plasma Osmolality ◽  
Fat Content ◽  
Winter Conditions ◽  
All Solutions ◽  
Young Of The Year ◽  
Green Sunfish

In laboratory experiments young-of-the-year green sunfish, Lepomis cyanellus, largemouth bass, Micropterus salmoides, brook trout, Salvelinus fontinalis, and yellow perch, Perca flavescens, were held for 4 mo under simulated winter conditions (2–4 °C; photoperiod of 9 h light: 15 h dark) in solutions of various osmotic strengths, from 90% distilled water to 1.0% NaCl. Mortality in three of five experiments often was greater in salt solutions, indicating that NaCl did not increase survival. Survival was greater for larger yellow perch than smaller but was not related to size in the other species. Hematocrit was depressed below control levels in all solutions at the end of experiments. The fish generally were able to regulate plasma osmotic concentration in all solutions except the highest NaCl concentrations, where plasma osmolality was often significantly higher than in the control at the end of experiments. Plasma Na+ and Cl− typically decreased and then recovered at low temperatures. Presence of Na+ and Cl− in the external medium tended to alleviate their loss from plasma. Changes in plasma Na+ and Cl− were not related to mortality in hypoionic solutions but usually did correspond to changes in plasma osmolality. Fat content of survivors declined and water content increased for all species, but the losses and gains were not related to osmolality of solutions. Low fat content probably was not a cause of death.Key words: Mortality, electrolyte regulation, osmolality, hematocrit, fat depletion, winter conditions, green sunfish, largemouth bass, brook trout, yellow perch, sodium, chloride

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