Observations on the Seasonal Changes of the Parasite Fauna of Yellow Perch (Perca flavescens) from the Bay of Quinte, Lake Ontario

1969 ◽  
Vol 26 (4) ◽  
pp. 833-843 ◽  
Author(s):  
Shibru Tedla ◽  
C. H. Fernando
Keyword(s):  
Seasonal Dynamics ◽  
High Intensity ◽  
Seasonal Changes ◽  
Yellow Perch ◽  
Perca Flavescens ◽  
Late Summer ◽  
Lake Ontario ◽  
Parasite Fauna ◽  
Early Fall ◽  
Larval Parasites

The seasonal changes in incidence and intensity of infestation of yellow perch, Perca flavescens, by adult and larval parasites, both external and internal, were studied over a period of 1 year. Eight species of parasites were numerous enough to permit analysis of seasonal dynamics. Bunodera luciopercae and Echinorhynchus salmonis showed a high infestation in the fall and declined gradually to zero by late summer. New infestation occurred in early fall. Protocephalus pearsei showed the highest incidence in summer and a lower level during the rest of the year without any marked fluctuations. The intensity of infestation remained relatively constant throughout the year. Ergasilus confusus reached its peak of incidence in the summer, declined through the fall and winter, and began increasing in spring. Intensity of infestation showed parallel changes. In February, however, both incidence and intensity were high. Diplostomulum huronense showed a high intensity of infestation in November. The incidence remained fairly constant throughout the rest of the year. Urocleidius adspectus showed no seasonal variability as regards incidence but the intensity of infestation was highest in August and September. Contracaecum spiculigerum showed no distinct seasonal changes in incidence or intensity. Glochidial infestation reached a high intensity in July. This was due to the glochidia of Lampisilis radiata siliquoidea.

Some Aspects of the Ecology of the Parasite Fauna of the Gills of Yellow Perch, Perca flavescens

1970 ◽  
Vol 27 (6) ◽  
pp. 1045-1050 ◽  
Author(s):  
Shibru Tedla ◽  
C. H. Fernando
Keyword(s):  
Yellow Perch ◽  
Perca Flavescens ◽  
Lake Ontario ◽  
Parasite Fauna

Three parasites, the monogenean Urocleidius adspectus, the copepod Ergasilus confusus, and the glochidia of Lampsilis radiata, were common on the gills of the yellow perch collected from the Bay of Quinte, Lake Ontario, from May 1967 to April 1968. No correlation was found between the incidences of infestation of these three parasites. Except for the glochidia, more parasites were found on the second and third gill arches than on the first and fourth. Other records from the gills were the glochidia of Elliptio complanatus, the myxosporidian Henneguya sp., and nonparasitic mites belonging to Hydrozetes sp.

Quantitative and Qualitative Characteristics of Somatic and Gonadal Growth of Yellow Perch (Perca flavescens) from Lac Ste. Anne, Alberta

1989 ◽  
Vol 46 (6) ◽  
pp. 989-994 ◽  
Author(s):  
R. W. Tanasschuk ◽  
W. C. Mackay
Keyword(s):  
Yellow Perch ◽  
Gonad Development ◽  
Perca Flavescens ◽  
Somatic Growth ◽  
Late Summer ◽  
The Other ◽  
Energy Utilization ◽  
Gonadal Growth ◽  
Males And Females ◽  
Qualitative Characteristics

A yellow perch (Perca flavescens) population from a shallow eutrophic north temperate lake was sampled 10 times between March 1976 and June 1977 to determine the characteristics of somatic and gonadal growth. Quantitatively, somatic growth differed in timing and extent among age-sex groups. One + males and females grew mostly in June whereas 2 + males grew mainly in July; 2 + females grew from June through September. Two + males grew less over the year than did the other age-sex groups. The qualitative characteristics of somatic growth were not influenced by sex or maturation. The timing of gonadal growth and the associated endogenous energy utilization differed between the sexes. One + females did not mature. Testes grew in late summer (August). There was no impact of gonad development on somatic composition of 1 + males whereas 2 + males appeared to use visceral fat. Gonadal growth for 2 + females began in August and continued through March and presumably to spawning in April; somatic lipid was depleted during ovarian growth.

Unexploited Percid Populations of West Blue Lake, Manitoba, and their Interactions

1977 ◽  
Vol 34 (10) ◽  
pp. 1655-1669 ◽  
Author(s):  
J. R. M. Kelso ◽  
F. J. Ward
Keyword(s):  
Yellow Perch ◽  
Perca Flavescens ◽  
Growth Period ◽  
Older Individuals ◽  
Behavioral Differences ◽  
Food Items ◽  
Blue Lake ◽  
Early Fall ◽  
Summer Growth ◽  
Main Food Item

West Blue Lake, Manitoba, essentially unaffected by man, sustains populations of yellow perch, Perca flavescens, and walleye, Stizostedion vitreum vitreum, which interact in two fundamental ways: perch are a major source of energy for walleye and the two species share common food organisms.Perch adults, juveniles and fry generally contributed 80–90% of the energy required for the annual walleye production (340 kg) and, on the basis of conversion experiments, provided for at least 1.7 kg∙ha−1 of the observed production of 2.1 kg∙ha−1. The brief summer growth period, combined with moderate mortality, caused biomass to reach a maximum in early fall at which time production ceased.Although walleye utilized yellow perch as its basic energy supply, behavioral differences tended to offer protection to juvenile and adult perch. Walleye were active at night, whereas older perch w ere inactive. Age 0 perch, during their epilimnetic phase, on the other hand, were active at night and vulnerable to walleye predation providing at least 18% of the observed walleye production.Walleye and yellow perch shared the same food resources although at different times and to different degrees. This competition was most intense between walleye (> 25 cm) and adult perch (> 12 cm). A main food item shared was amphipods. Most other food items (sticklebacks, mayflies, crayfish) were also shared but none in equal proportions by the two percids.Neither of the percid species showed a preponderance of older individuals and both showed evidence of strong and weak year-classes — walleye to a greater degree. Also, for walleye at least, production was only 2.1 kg∙ha−1, and biomass appeared to be stable, approximately 900 kg. Growth for both species was less than most other percid communities and was restricted to a brief, ≈ 80 day, period. Key words: unexploited, yellow perch, walleye, feeding, behavior, production, population structure

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.

Intraspecific Resource Partitioning by Yellow Perch (Perca flavescens) in a Stratified Lake

1984 ◽  
Vol 41 (12) ◽  
pp. 1745-1752 ◽  
Author(s):  
Mark B. Sandheinrich ◽  
Wayne A. Hubert
Keyword(s):  
Resource Use ◽  
Yellow Perch ◽  
Perca Flavescens ◽  
Habitat Type ◽  
Late Summer ◽  
Niche Overlap ◽  
Size Classes ◽  
Use Patterns ◽  
Different Depths ◽  
Food Partitioning

Summer habitat use and relative abundances of different size classes of yellow perch (Perca flavescens) were determined using gill nets set in the main basin, deep bays, and shallow bays of a lake. Niche overlap indices were used to quantify resource use patterns. Size classes spatially segregated into different habitats, but not different depths within a habitat type. Segregation of sexes at different depths was observed with females occupying warm, shallow areas, whereas males were more common in cool, deep water. Formation of an anoxic hypolimnion restricted perch to the epilimnion in late summer, but patterns of habitat segregation observed prior to thermocline formation were maintained. Food partitioning was relatively unimportant in reducing niche overlap. Spatial segregation of perch size classes and sexes may compensate for high diet overlap between conspecifics and reinforces the importance of habitat partitioning in structuring fish communities.

Seasonal changes in activity patterns and the adaptive value of haying in pikas (Ochotona princeps)

1983 ◽  
Vol 61 (2) ◽  
pp. 411-416 ◽  
Author(s):  
Douglas A. Conner
Keyword(s):  
Surface Activity ◽  
Seasonal Changes ◽  
Activity Patterns ◽  
Winter Season ◽  
Late Summer ◽  
Early Summer ◽  
Cold Temperatures ◽  
Vegetation Growth ◽  
Ochotona Princeps ◽  
Early Fall

Seasonal changes in the performance of four behaviors, perching, haying, feeding, and surface activity were studied in two populations of North American pikas (Ochotona princeps) living in Colorado. During late summer and early fall (July–September), haying, the gathering of meadow vegetation followed by storing it in their talus territories, made up almost 55% of the pikas' surface activity. After haying ceased, pikas continued to feed in the meadows until snowpack, cold temperatures, and the absence of surface vegetation made this impossible. Beginning in February, individuals remained under the snowpack feeding on vegetation from their hay piles and on lichens available below the snow. Surface activity was not seen again until May when spring vegetation began to appear. Haying appears to be an adaptive response to environmental unpredictability. Hay piles most likely become critical for survival when harsh weather prevents surface foraging and(or) delays the emergence of new vegetation growth in the spring or early summer. It is suggested that the evolution of territoriality in pikas is related to the need to gather sufficient vegetation to serve as a potential winter food supply during years when the winter season is unusually harsh or prolonged.

Seasonal dynamics of nutrients in a Carex meadow

1982 ◽  
Vol 60 (9) ◽  
pp. 1671-1678 ◽  
Author(s):  
Allan N. D. Auclair
Keyword(s):  
Aboveground Biomass ◽  
Seasonal Dynamics ◽  
Seasonal Changes ◽  
Late Summer ◽  
Dry Weight ◽  
Early Summer ◽  
Nutrient Accumulation ◽  
Maximum Accumulation ◽  
Mobility Of Elements ◽  
Uptake And Release

Nutrient accumulation in aboveground biomass and mobilization of nutrients in litter were studied on a Carex meadow in southern Quebec, Canada. Seasonal changes were characterized by short periods of rapid element uptake and release. By late May the total element levels were 80% of maximum. Accumulation of N, P, and K was rapid relative to early increments in biomass. Ca, Mg, and micronutrients were taken up from the soil solution across the season and levels paralleled changes in biomass. In early summer elements were released from litter more rapidly than litter dry weight declined. Mobility of elements decreased in the order K > Mg > P > N > Ca. Overwinter, 83% of K was released, whereas Ca concentration in litter increased overwinter and through the following summer. Immobilization of Fe in litter was pronounced. Overall, > 90% of the element mass in green late-summer shoots was retained in litter overwinter.

Fecundity of the yellow perch, Perca flavescens Mitchill, in the Bay of Quinte, Lake Ontario

1969 ◽  
Vol 47 (1) ◽  
pp. 55-58 ◽  
Author(s):  
A. N. Sheri ◽  
G. Power
Keyword(s):  
Yellow Perch ◽  
Perca Flavescens ◽  
Lake Ontario ◽  
Ovary Weight ◽  
Individual Fecundity

The relationships between the logarithm of the number of ova shed by yellow perch in the Bay of Quinte and length, weight, and age of the fish were found to be: Y = 2.982 + 0.007X where X is length in millimeters; Y = 3.769 + 0.004X where X is weight in grams; Y = 3.780 + 0.098X where X is the age in completed years. The logarithm of the number of mature ova spawned = 4.082 + 0.003 multiplied by the ovary weight in grams. Individual fecundity ranged from 3035 for a II + fish, 135 mm, 27.2 g to 61 465 for a VIII + fish, 257 mm, 308.4 g.

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