Comparison of genetic and visual identification of cisco and lake whitefish larvae from Chaumont Bay, Lake Ontario

Cisco (Coregonus artedi) are an important component of native food webs in the Great Lakes, and their restoration is instrumental to the recovery of lake trout (Salvelinus namaycush) and Atlantic salmon (Salmo salar). Difficulties with visual identification of larvae can confound early life history surveys, as cisco are often difficult to distinguish from lake whitefish (Coregonus clupeaformis). We compared traditional visual species identification methods with genetic identifications based on barcoding of the mitochondrial cytochrome c oxidase I gene for 726 coregonine larvae caught in Chaumont Bay, Lake Ontario. We found little agreement between the visual characteristics of cisco identified by genetic barcoding and the most widely used dichotomous key, and the considerable overlap in ranges of traditionally utilized metrics suggests that visual identification of coregonine larvae from Chaumont Bay is impractical. Coregonines are highly variable and plastic species and often display wide variations in morphometric characteristics across their broad range. This study highlights the importance of developing accurate, geographically appropriate larval identification methods to best inform cisco restoration and management efforts.

Download Full-text

Occurrence of the eyefluke, Diplostomum (Diplostomum) baeri bucculentum Dubois et Rausch, 1948, in salmonid fishes of northern British Columbia

Canadian Journal of Zoology ◽

10.1139/z85-060 ◽

1985 ◽

Vol 63 (2) ◽

pp. 396-399 ◽

Cited By ~ 4

Author(s):

Hilda Lei Ching

Keyword(s):

Rainbow Trout ◽

Chinook Salmon ◽

Sockeye Salmon ◽

Lake Trout ◽

Infected Fish ◽

Salmo Gairdneri ◽

Coregonus Clupeaformis ◽

Lake Whitefish ◽

Dolly Varden Salvelinus Malma ◽

Prosopium Williamsoni

As a result of experimental infections in chicks, diplostomula found in the retina of chinook salmon from the Nechako River were identified as Diplostomum (Diplostomum) baeri bucculentum. Eyeflukes in other salmonids were considered to be the same species based on similar measurements and site in the eyes. These eyeflukes varied in prevalence and mean intensity in seven salmonid species surveyed in nine localities in 1979–1981. The following fish were sampled: rainbow trout (Salmo gairdneri), 505; mountain whitefish (Prosopium williamsoni), 334; lake whitefish (Coregonus clupeaformis), 32; Dolly Varden (Salvelinus malma), 66; lake trout (S. namaycush), 13; kokanee or sockeye salmon (Oncorhynchus nerka), 323; and chinook salmon (O. tshawytscha), 164. Eyeflukes had prevalences ranging from 84 to 100% in six lakes, 64% in the river, 53% in one reservoir site, and a prevalence of 15% in the other reservoir site. Mountain and lake whitefishes had high mean intensities while kokanee had low mean intensities. Correlation of increased intensity with increased fish size was significant for 6 of 27 samples. Four samples of lake whitefish, mountain whitefish, rainbow trout, and chinook salmon showed significant asymmetry when numbers of diplostomula were compared between eyes. More of the heavily infected fish showed asymmetry than did the lightly infected fish.

Download Full-text

Changes in fish populations affected by the construction of the La Grande complex (Phase I), James Bay region, Quebec

Canadian Journal of Zoology ◽

10.1139/z95-219 ◽

1995 ◽

Vol 73 (10) ◽

pp. 1860-1877 ◽

Cited By ~ 7

Author(s):

Jean-Claude DesLandes ◽

Sylvie Guénette ◽

Yves Prairie ◽

Réjean Fortin ◽

Dominique Roy ◽

...

Keyword(s):

Lake Trout ◽

Salvelinus Namaycush ◽

Coregonus Clupeaformis ◽

Lake Whitefish ◽

Time Intervals ◽

Complex Phase ◽

Coregonus Artedii ◽

Secondary Productivity ◽

Longnose Sucker ◽

The Impact

Catches per unit of effort (CPUE) with experimental gill nets, recruitment, growth, and condition were monitored between 1977 and 1992 to evaluate the impact of impoundment on the main fish species of La Grande 2, Opinaca, and Caniapiscau reservoirs and the Boyd–Sakami diversion. CPUE and recruitment of northern pike (Esox lucius) and lake whitefish (Coregonus clupeaformis) increased markedly at most stations after impoundment and decreased at the end of the series. The lake whitefish and cisco (Coregonus artedii) showed their most striking rise in CPUE at two bay stations of La Grande 2 and Opinaca reservoirs. CPUE and recruitment of the longnose sucker (Catostomus catostomus), white sucker (Catostomus commersoni), and lake trout (Salvelinus namaycush) (Caniapiscau) showed a general decrease following impoundment. CPUE for the walleye (Stizostedion vitreum) also decreased at several stations; however, the two most southerly stations in La Grande 2 reservoir and the Boyd–Sakami station showed high CPUE during the series. Concentration–redistribution phenomena explain part of the observed variations in CPUE. Correlation analyses showed that walleyes and white suckers were attracted to the warmer, more turbid stations, and that the high primary and secondary productivity of bay stations attracted the coregonines. Growth and condition of the main species increased during variable time intervals after impoundment and decreased at the end of the series.

Download Full-text

Accumulation, distribution and toxicology of dietary nickel in lake whitefish (Coregonus clupeaformis) and lake trout (Salvelinus namaycush)

Comparative Biochemistry and Physiology Part C Toxicology & Pharmacology ◽

10.1016/s1532-0456(01)00228-9 ◽

2001 ◽

Vol 130 (2) ◽

pp. 145-162 ◽

Cited By ~ 11

Author(s):

M.D Ptashynski ◽

R.M Pedlar ◽

R.E Evans ◽

K.G Wautier ◽

C.L Baron ◽

...

Keyword(s):

Lake Trout ◽

Salvelinus Namaycush ◽

Coregonus Clupeaformis ◽

Lake Whitefish

Download Full-text

Migration and development of swim-bladder nematodes, Cystidicola spp. (Habronematoidea), in their definitive hosts

Canadian Journal of Zoology ◽

10.1139/z80-275 ◽

1980 ◽

Vol 58 (11) ◽

pp. 1997-2005 ◽

Cited By ~ 17

Author(s):

Geoff A. Black ◽

Murray W. Lankester

Keyword(s):

Rainbow Trout ◽

Lake Trout ◽

Distinct Species ◽

Salmo Gairdneri ◽

Swim Bladder ◽

Coregonus Clupeaformis ◽

Lake Whitefish ◽

Northwestern Ontario ◽

Third Stage ◽

Migration And Development

Third-stage larvae of Cystidicola cristivomeri White, 1941, and C. farionis Fischer, 1798, migrated directly via the pneumatic duct to the swim bladder of lake trout, Salvelinus namaycush, and rainbow trout, Salmo gairdneri, respectively. Larvae reached the swim bladder as early as 16 h after fish were infected using a stomach tube. At 4–10 °C, mature male and female C. cristivomeri and C. farionis were first recovered 67 and 210 days, and 112 and 235 days, respectively, after infection. Cystidicola cristivomeri is probably long-lived; there was no evidence that any died in lake trout infected for up to 600 days.Large numbers of third-stage cystidicolid larvae accumulated without maturing in the swim bladder of naturally infected lake whitefish, Coregonus clupeaformis, from Lake Nipigon, northwestern Ontario. When given to rainbow trout, these larvae matured and the adult nematodes were identical to C. farionis. These results suggest that the swim-bladder nematode that matures in lake whitefish is a distinct species.

Download Full-text

Fecundity Changes in Exploited Populations of Lake Whitefish (Coregonus clupeaformis) and Lake Trout (Salvelinus namaycush)

Journal of the Fisheries Research Board of Canada ◽

10.1139/f78-155 ◽

1978 ◽

Vol 35 (7) ◽

pp. 945-950 ◽

Cited By ~ 49

Author(s):

M. C. Healey

Keyword(s):

Key Words ◽

Lake Trout ◽

Salvelinus Namaycush ◽

Coregonus Clupeaformis ◽

Lake Whitefish ◽

Northern Canada ◽

Average Fecundity ◽

Individual Fecundity

This report considers the possibility that exploited populations of lake whitefish (Coregonus clupeaformis) and lake trout (Salvelinus namaycush) may show increased individual fecundity. Average fecundity of both species in three exploited lakes varied significantly between 1972 and 1976, while fecundity in an adjacent unexploited lake did not vary. Changes in the fecundity of whitefish and trout in the exploited lakes were not clearly related to the pattern and intensity of exploitation, but fecundity of both species increased in all exploited lakes after exploitation, with trout showing the greater response. Key words: fecundity, lake whitefish, lake trout, exploitation, northern Canada

Download Full-text