Couesius plumbeus: NatureServe

2011 ◽  
Author(s):  
Keyword(s):  
Couesius Plumbeus

scholarly journals Occurrence of Lake Chub, Couesius plumbeus, in Northern Labrador

2010 ◽  
Vol 124 (2) ◽  
pp. 113 ◽  
Author(s):  
Wendy K. Michaud ◽  
Robert C. Perry ◽  
J. Brian Dempson ◽  
Milton Shears ◽  
Michael Power
Keyword(s):  
Glacial Lake ◽  
River Drainage ◽  
Dispersal Routes ◽  
George River ◽  
Couesius Plumbeus

Lake Chub (Couesius plumbeus) were recently found in seven previously undocumented locations in northern Labrador. These populations represent the first recorded accounts of this species in the Labrador region north of the Churchill River drainage and east of the George River. Lake Chub likely invaded this region via dispersal routes provided by eastern spillways of glacial Lake Naskaupi.

Larval stages of the lake chub, Couesius plumbeus

1981 ◽  
Vol 59 (2) ◽  
pp. 218-224 ◽  
Author(s):  
Lee A. Fuiman ◽  
Joan P. Baker
Keyword(s):  
External Morphology ◽  
Caudal Peduncle ◽  
Larval Stages ◽  
Rhinichthys Cataractae ◽  
Couesius Plumbeus

Three collections of Couesius plumbeus eggs were laboratory reared. Larvae were described with emphasis on external morphology. They were characterized by (1) 25 to 30 preanal myomeres, (2) a diagonal row of melanophores across the surface of the breast, and (3) a concentration of melanophores on the distal hypaxial portion of the caudal peduncle. Larval characteristics were compared with those of its breeding associate Rhinichthys cataractae and other sympatic cyprinids which have similarly high preanal myomere counts.

Some Myxosporidia found in certain freshwater fishes water fishes in Quebec province, Canada

Parasitology ◽  
1939 ◽  
Vol 31 (1) ◽  
pp. 1-77 ◽  
Author(s):  
H. B. Fantham ◽  
Annie Porter ◽  
L. R. Richardson
Keyword(s):  
Fresh Water ◽  
Economic Importance ◽  
Fresh Water Fish ◽  
Ecological Research ◽  
Host Fish ◽  
Water Fish ◽  
Rivers And Lakes ◽  
The Many ◽  
Couesius Plumbeus ◽  
Rich Fauna

The Province of Quebec provides a magnificent field for fresh-water faunistic and ecological research on account of its numerous rivers and lakes. Investigations in ecology and ecological parasitology by the authors have revealed a rich fauna in the areas described herein.Examinations of fourteen species of fresh-water fish have produced twenty-eight species of Myxosporidia, of which twenty-five are new and three have been already described. The existence of races or strains or varieties of some of the forms is demonstrated.Descriptions and illustrations are given of twenty-eight Myxosporidia found by the authors in fresh-water fishes of Quebec Province. The new species include: Sphaerospora notropis, Myxidium percae, Zschokkella salvelini, Myxosoma notropis, M. commersonii, M. orbitalis, M. pfrille, M. media, M. ellipticoides, M. parellipticoides, Myxobolus poecilichthidis, M. dentium, M. percae, M. rhinichthidis, M. notropis, M. catostomi, M. couesii, M. hybo-rhynchi, M. subcircularis, M. transversalis, M. grandis, Henneguya fontinalis, H. fontinalis var. notropis, H. percae, H. salmonis and H. esocis. Myxosoma catostomi Kudo, Myxobolus conspicuus Kudo and M. ovoidalis Fantham are described from Canadian fishes. Details are given of a series of races, strains or varieties of Thelohanellus notatus Mavor, of Myxobolus catostomi, of M. notropis and of Henneguya fontinalis from other than the original host fish.The pathology of the myxosporidian infections from the many different situations in the hosts is discussed. Unusual sites of infection are the palatine teeth of Esox maskinongy with Myxobolus dentium and the iris of the eye of Couesius plumbeus with Myxobolus couesii.In connexion with the economic importance of the Myxosporidia found in Quebec fishes, the destruction of young fish, alteration of the character of the fauna dependent on the same, human food supply, possible epizootics in hatcheries and possible cross-infection of game fishes and other fishes of economic importance are considered. The immediate danger is not great; it is the future that may be imperilled.

CYCLICAL CHANGES IN THE TESTICULAR ACTIVITY OF THE LAKE CHUB, COUESIUS PLUMBEUS (AGASSIZ)

1966 ◽  
Vol 44 (2) ◽  
pp. 149-159 ◽  
Author(s):  
Syed Nazar Ahsan
Keyword(s):  
Environmental Factors ◽  
Water Temperature ◽  
Quantitative Evaluation ◽  
Annual Cycle ◽  
Day Length ◽  
Temperate Latitude ◽  
Histochemical Methods ◽  
Couesius Plumbeus

The cyclical changes in the activity of the testes of a teleost, the lake chub, from a north temperate latitude have been studied by histological and histochemical methods with a quantitative evaluation of the different spermatogenetic stages. The annual testicular cycle is divided into live stages and cyclical changes in the spermatogenetic activity have been related to the changing environmental factors, namely day length and water temperature. The annual cycle consists of a prolonged mitotic phase during the fall and winter, and a shorter meiotic phase during the spring. Lobule boundary cells have been examined and changes in their activity have been recorded. Continued spermatogenetic activity during spawning enables repeated spermiation, which is advantageous since the males are comparatively fewer than the females.

Distribution of Fish Species in Great Bear Lake, Northwest Territories, with Reference to Zooplankton, Benthic Invertebrates, and Environmental Conditions

1975 ◽  
Vol 32 (11) ◽  
pp. 1989-2004 ◽  
Author(s):  
Lionel Johnson
Keyword(s):  
Benthic Invertebrates ◽  
Salvelinus Namaycush ◽  
Coregonus Clupeaformis ◽  
Benthic Organisms ◽  
Mysis Relicta ◽  
Bear Lake ◽  
Bear River ◽  
Couesius Plumbeus ◽  
High Degree ◽  
Distribution Of Fish

Benthic invertebrates in Great Bear Lake are most highly concentrated in the upper 20 m. Densities between 20 and 100 m are low; below 100 m only Mysis relicta and Myoxocephalus quadricornis exist at measurable densities. All benthic organisms exhibit a high degree of patchiness.Lake trout, Salvelinus namaycush, and M. quadricornis are two species that inhabit the lake at all depths (3–400 m) and temperatures (13.2 C for M. quadricornis and 15 C for S. namaycush).Whitefish, Coregonus clupeaformis, inhabit only the bays, seldom being caught in water over 20 m deep. The distribution of whitefish is considered to be restricted mainly by the density of benthic organisms.Three species are confined to the periphery of the lake, Stizostedion vitreum, Lota lota, and Catostomus catostomus. Two species, Couesius plumbeus and Percopsis omiscomaycus, are present in the headwaters and Great Bear River but have not been able to establish themselves in Great Bear Lake. Extreme oligotrophy is considered to have had the effect of reducing species diversity.

Seasonal changes in the short-term activity and ultradian rhythms of a cyprinid fish, the lake chub, Couesius plumbeus

1981 ◽  
Vol 59 (3) ◽  
pp. 486-492 ◽  
Author(s):  
Martin Kavaliers
Keyword(s):  
Seasonal Changes ◽  
Temporal Pattern ◽  
Circadian System ◽  
Cyprinid Fish ◽  
Constant Darkness ◽  
Ultradian Rhythms ◽  
Short Term ◽  
Free Running ◽  
Annual Changes ◽  
Couesius Plumbeus

The temporal pattern of the locomotor activity of a cyprinid fish, the lake chub, Couesius plumbeus, was examined under seasonally appropriate light–dark cycles that included twilights and under constant darkness. Photoperiodically entrained and free-running circadian activity from constant darkness was composed of nonrandomly distributed short-term activity components (0.5–3.5 h) with significant ultradian frequencies. In both cases there was an annual rhythm in the length of the ultradian periods, ranging from 0.7 h in winter to 2.5 h in summer. This pattern was accompanied by annual changes in the frequency distribution of short-term activity components. Ultradian periods were correlated with both daylength in the entraining light–dark cycles and the seasonal changes in the circadian period of fish free-running under constant darkness. These results suggest that the expression of ultradian rhythms and short-term locomotor bouts is controlled by a multioscillator circadian system.

Breeding Biology of the Lake Chub, Couesius plumbeus, at Lac la Ronge, Saskatchewan

1970 ◽  
Vol 27 (6) ◽  
pp. 1005-1015 ◽  
Author(s):  
Joseph H. Brown ◽  
U. Theodore Hammer ◽  
Gordon D. Koshinsky
Keyword(s):  
Sexual Dimorphism ◽  
Age Groups ◽  
Rocky Shores ◽  
Spawning Activity ◽  
Group Iii ◽  
Pectoral Fins ◽  
Breeding Activity ◽  
Couesius Plumbeus ◽  
First Time ◽  
Established Species

Spawning of the lake chub, Couesius plumbeus (Agassiz), was investigated at Lac la Ronge from 1966 to 1968. Nonadhesive eggs were freely dispersed in rocky shallows in the tributary Montreal River during May and along rocky shores of the lake in late June. Temperature played a regulating role and most breeding activity occurred after the water reached 10 C. Some 4000 individuals were marked by finclipping and subsequent recaptures revealed that chubs migrated as much as 3 km in order to spawn in the river.Early arrivals in the river were cryptic. Males were somewhat aggressive during spawning but no territoriality was observed in the field. No nests were built and there was no parental guarding. Males outnumbered females on the spawning grounds and spawning activity was polyandrous. Males courted females by a combination of persistent pursuit and specially directed nudging. Sexual dimorphism was apparent in the larger pectoral fins, the more distinct dark lateral stripe, and the greater development of nuptial tubercles and orange breeding marks on males.Age-group III females made up 68% of the spawning population in 1968 and contributed 54% of potential recruitment. These fish were spawning for the first time at a mean total length of 95.1 mm. Age-groups V and over constituted 6% of the spawning females and contributed 13% of potential recruitment. The largest female captured was 147 mm total length.Certain fundamental aspects of the breeding behaviour were found to be inconsistent with that reported among established species in the genus Hybopsis. Inclusion of the lake chub within Hybopsis as has been suggested by some investigators is accordingly considered indefensible.

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