Epizootiology, pathology, and description of Eustrongylides tubifex (Nematoda: Dioctophymatoidea) in fish

1988 ◽  
Vol 66 (10) ◽  
pp. 2212-2222 ◽  
Author(s):  
Lena N. Measures
Keyword(s):  
Yellow Perch ◽  
Perca Flavescens ◽  
Infected Fish ◽  
Lepomis Gibbosus ◽  
Fourth Stage ◽  
Intermediate Hosts ◽  
Third Stage ◽  
Rock Bass ◽  
Ambloplites Rupestris ◽  
Fish Hosts

In Guelph Lake, a man-made reservoir in Ontario, Canada, prevalence of larval Eustrongylides tubifex in pumpkinseed (Lepomis gibbosus), rock bass (Ambloplites rupestris), and yellow perch (Perca flavescens) was 12.9% and mean intensity ranged from 1 to 1.8. Larvae were encapsulated on the mesentery of fish. Pumpkinseed and yellow perch were the important fish hosts in Guelph Lake as most larvae in these fish were alive. In contrast, 40% of larvae in rock bass were dead and calcified. Third- and fourth-stage larvae from naturally infected fish are described. Larvae in the three species of fish elicited a granulomatous inflammatory reaction. Attempts to transfer third-stage larvae from experimentally infected oligochaetes and third-stage larvae from naturally infected fish to laboratory-reared pumpkinseed were unsuccessful. Fourth-stage larvae from naturally infected fish were transferred successfully to pumpkinseed. Eutropic lakes such as Guelph Lake are particularly suitable enzootic areas because of the abundant populations of tubificid intermediate hosts and the presence of fish hosts such as pumpkinseed and perch. The advanced stage and development of larvae (to the fourth stage) in fish likely represents an adaptation for a parasite that occurs in a migratory host such as Common Mergansers (Mergus merganser), which frequent Guelph Lake for only about 1 month in spring and fall.

Observations on the biology of Ergasilus spp. (Cyclopoidea: Copepoda) infesting North American freshwater fishes

1969 ◽  
Vol 47 (3) ◽  
pp. 405-408 ◽  
Author(s):  
Shibru Tedla ◽  
C. H. Fernando
Keyword(s):  
Yellow Perch ◽  
Host Preference ◽  
Parasite Species ◽  
Perca Flavescens ◽  
Smallmouth Bass ◽  
Lepomis Gibbosus ◽  
Rock Bass ◽  
Egg Number ◽  
Ambloplites Rupestris ◽  
Immature Specimen

The gills of 118 yellow perch, Perca flavescens; 18 pumpkinseed, Lepomis gibbosus; 14 rock bass, Ambloplites rupestris; and 15 smallmouth bass, Micropterus dolomieui, were examined for Ergasilus spp. Ergasilus caeruleus was recovered for pumpkinseed and E. confusus from yellow perch. Rock bass and smallmouth bass were infested with E. centrarchidarum and one immature specimen of this species was recovered from a pumpkinseed. The host preference of each parasite species is discussed. A relationship between the egg number of copepods with more than one host and the degree of host preference is suggested.

Observations on the glochidia of Lampsilis radiata (Gmelin) infesting yellow perch, Perca flavescens (Mitchill) in the Bay of Quinte, Lake Ontario

1969 ◽  
Vol 47 (4) ◽  
pp. 705-712 ◽  
Author(s):  
Shibru Tedla ◽  
C. H. Fernando
Keyword(s):  
Yellow Perch ◽  
White Perch ◽  
Micropterus Salmoides ◽  
Perca Flavescens ◽  
Lake Ontario ◽  
Smallmouth Bass ◽  
Lepomis Gibbosus ◽  
Experimental Conditions ◽  
Pomoxis Nigromaculatus ◽  
Rock Bass

Analysis of incidence and intensity of infestation of yellow perch, Perca flavescens (Mitchill), by the glochidia of Lampsilis radiata from weekly samples from May to September and single samples in October and November indicate that the two subspecies, Lampsilis radiata radiata and Lampsilis radiata siliquoidea, shed their glochidia in late spring and throughout the summer in the Bay of Quinte, Lake Ontario. Smaller fish are more heavily infested with these glochidia than larger ones. About 50% of the preparasitic glochidia of Lampsilis radiata siliquoidea survived for 12, 70, and 120 h at 20°, 12°, and 10 °C respectively. The parasitic period of the glochidia of L. r. siliquoidea on yellow perch under experimental conditions was 50 days at 15 °C from the May infestation. Yellow perch carried the glochidia for a longer period from an August infestation. All the glochidia recovered 50 days after infestation, both from May and August infestations, had undergone metamorphosis. There was no difference in the degrees of infestation of the different species of fish used in our experiments. Pumpkinseed, Lepomis gibbosus (Linnaeus); rock bass, Ambloplites rupestris (Rafinesque); and white perch, Roccus americanus (Gmelin) lost their infestations in a week. Presumably no metamorphosis took place under these conditions. Black crappie, Pomoxis nigromaculatus (LeSueur); largemouth bass, Micropterus salmoides (Lacepede), smallmouth bass, M. dolomieui Lacepede: and yellow perch carried the infestation till they were killed 20 days later. There was no relationship between the numbers of glochidia (Lampsilis radiata) and copepods, (Ergasilus confusus Bere) on naturally infested yellow perch, nor on rock bass, smallmouth bass, and pumpkinseed which harbored Ergasilus spp. naturally and which were infested with the glochidia of L. r. siliquoidea experimentally.

Branching complexity and morphological characteristics of coarse woody structure as lacustrine fish habitat

2005 ◽  
Vol 62 (9) ◽  
pp. 2110-2123 ◽  
Author(s):  
Michael G Newbrey ◽  
Michael A Bozek ◽  
Martin J Jennings ◽  
James E Cook
Keyword(s):  
Littoral Zone ◽  
Yellow Perch ◽  
Fish Habitat ◽  
Lepomis Macrochirus ◽  
Perca Flavescens ◽  
Morphological Characteristics ◽  
Smallmouth Bass ◽  
Micropterus Dolomieu ◽  
Rock Bass ◽  
Ambloplites Rupestris

The objective of this study was to quantify the physical characteristics of coarse woody structure (CWS) as fish habitat in a north temperate lake. Sixteen species of fish were observed in submerged CWS habitat. Branching complexity, distance above the bole, area below the bole, distance to other CWS, and water depth around CWS were significantly related to abundance of schooling cyprinids (Cyprinidae), rock bass (Ambloplites rupestris), smallmouth bass (Micropterus dolomieu), bluegill (Lepomis macrochirus), yellow perch (Perca flavescens), and walleye (Sander vitreus). Branching complexity was the most common characteristic of CWS related to richness, diversity, and total adult abundance of fish taxa, but was not correlated with the total lengths of fish found in submerged trees. Branching-complexity values ranged from 1 (simple) to 500 (moderately complex) in the littoral zone; for comparison, a living riparian conifer had a branching-complexity value of over 1000. Most CWS in the littoral zone was composed of simple trees without branching, but fish tended to inhabit CWS with branching-complexity values greater than 45. This study shows the importance of CWS with fine branching as littoral-zone fish habitat.

Influence of Predatory Fish Density on Trapability of Crayfish in Ontario Lakes

1983 ◽  
Vol 40 (10) ◽  
pp. 1820-1828 ◽  
Author(s):  
Nicholas C. Collins ◽  
Harold H. Harvey ◽  
Ann Jane Tierney ◽  
David W. Dunham
Keyword(s):  
Largemouth Bass ◽  
Yellow Perch ◽  
Perca Flavescens ◽  
Predatory Fish ◽  
Orconectes Propinquus ◽  
Rock Bass ◽  
Interspecific Comparisons ◽  
Ambloplites Rupestris ◽  
Trap Catches ◽  
Crayfish Species

In 19 central Ontario lakes the catches of crayfish in baited minnow traps usually were well predicted by numbers of crayfish counted in timed underwater searches. Exceptions were lakes with relatively high predator densities, where trap catches were far less than expected from search counts. In a stepwise linear regression, an index of the density of rock bass (Ambloplites rupestris) in the lakes was significantly negatively correlated with trapability. Smallmouth and largemouth bass (Micropterus dolomieui and M. salmoides), despite their reputation for consuming crayfish, were not significantly correlated with variations in trapability across lakes, but they reduced trapability and altered crayfish behavior in one lake. Yellow perch (Perca flavescens) density was positively correlated with trapability. The predatory basses appear to reduce trapability of crayfish more than they affect crayfish density; high crayfish populations were found in some lakes with dense bass populations. Predator-mediated changes in trapability seem consistent across the crayfish species Orconectes propinquus, O. virilis, and Cambarus robustus. In aquaria without predators, O. propinquus from a lake with high bass density were more nocturnal, more shelter-bound, and less active than those from a lake without bass. Behavior of females differed more between these two lakes than that of males, which are less vulnerable to predation than females. These behavior differences persisted for at least 3 wk in the laboratory, indicating that interspecific comparisons of behavior could be misleading unless the populations studied had similar histories of predation risk. The observed interlake variation in trapability suggests that catches in passive traps may be poor indices of crayfish density.

Sexual differences in accumulation of mercury in four species of centrarchid fishes

1988 ◽  
Vol 66 (4) ◽  
pp. 944-949 ◽  
Author(s):  
Paul F. Nicoletto ◽  
Albert C. Hendricks
Keyword(s):  
Lepomis Macrochirus ◽  
Mercury Content ◽  
Lepomis Gibbosus ◽  
South Fork ◽  
The South ◽  
Male And Female ◽  
Rock Bass ◽  
Males And Females ◽  
Redbreast Sunfish ◽  
Ambloplites Rupestris

A 3-year study of fish from the South River, and the South Fork of the Shenandoah River, and the Shenandoah River in Virginia revealed significant differences in the muscle mercury content of males and females. Female rock bass, Ambloplites rupestris, redbreast sunfish, Lepomis auritus, pumpkinseed, Lepomis gibbosus, and bluegill, Lepomis macrochirus contained higher levels of mercury than the males of each species. An analysis of these species indicated that sex-related differences in mercury levels were not due to differences in body size but may have been related to the onset of reproduction. For example, mercury levels in 1-year-old male and female redbreast sunfish were not significantly different: females averaged 0.66 μg Hg/g and males averaged 0.63 μg Hg/g. However, at 2 years of age, when redbreast sunfish first reproduce, females contained significantly more mercury than males: females averaged 0.84 μg Hg/g and males averaged 0.60 μg Hg/g. Analysis of the other species yielded similar results.

Seasonal population changes of Physaloptera maxillaris (Nematoda: Physalopteroidea) in striped skunk (Mephitis mephitis)

1976 ◽  
Vol 54 (4) ◽  
pp. 522-525 ◽  
Author(s):  
Richard J. Cawthorn ◽  
Roy C. Anderson
Keyword(s):  
Late Summer ◽  
Mephitis Mephitis ◽  
Fourth Stage ◽  
Intermediate Hosts ◽  
Population Changes ◽  
Striped Skunk ◽  
Third Stage ◽  
Early Fall ◽  
June July ◽  
Seasonal Population

The stomachs of 162 (89%) of 183 striped skunk (Mephitis mephitis) collected in the area of Guelph, Ontario, between September 1973 and August 1974 were infected with Physaloptera maxillaris. Adult worms were most abundant in midsummer (June–July) and rare in winter (December–March). Third-stage larvae were most abundant in late fall and midwinter (October–January) and least abundant in midsummer (June–July). Fourth-stage larvae were most abundant in spring (April–May) and least abundant in early fall (August–September). It is suggested that adults appear mainly when skunk are feeding regularly in spring and midsummer. Third-stage larvae acquired in late summer and fall fail to develop (probably because of inadequate food consumption by skunk) and persist over the winter. In spring when skunk start to feed again, overwintering larvae grow into adults and initiate the annual cycle in skunk and intermediate hosts.

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