Comparison of Leptorhynchoides thecatus (Acanthocephala) Recruitment into Green Sunfish and Largemouth Bass Populations

1996 ◽  
Vol 82 (5) ◽  
pp. 702 ◽  
Author(s):  
P. D. Olson ◽  
B. B. Nickol
Keyword(s):  
Largemouth Bass ◽  
Green Sunfish ◽  
Leptorhynchoides Thecatus

Agonistic Behavior in Several Species of Fish

1965 ◽  
Vol 16 (3) ◽  
pp. 845-850 ◽  
Author(s):  
Arthur L. McDonald ◽  
Norman W. Heimstra
Keyword(s):  
Rainbow Trout ◽  
Largemouth Bass ◽  
Agonistic Behavior ◽  
Yellow Perch ◽  
Observation Session ◽  
Interspecies Differences ◽  
Green Sunfish

Seven species of fish were studied in an attempt to determine interspecies differences in the amount and type of agonistic behavior shown. Fish in each species were paired and the frequency of attacks shown during a 5-min. observation session was recorded. An observation session was held for 16 pairs of fish of the same species on 5 consecutive days. It was found that bluegill showed the highest frequency of attacks, then green sunfish, largemouth bass, rainbow trout, black crappie, and yellow perch in that order. No attacks were recorded for walleyes during any of the observation sessions. Qualitative differences shown in agonistic behavior among the various species are also discussed.

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.

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