Observations on the Pygmy Whitefish, Prosopium coulteri, from Bull Lake, Montana

Weisel, George F.; Dillon, John

doi:10.2307/1440331

Cited by 10 publications

(33 citation statements)

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“…They probably scatter their eggs over coarse gravel, as do other species in this genus (Scott and Crossman 1973;Wydoski and Whitney 1979). Lake Superior pygmy whitefish spawn in November or December (Eschmeyer and Bailey 1954) as do pygmy whitefish in Flathead Lake, Montana (Weisel et al 1973) and Brooks Lake, Alaska (Heard and Hartman 1966). Lake spawning by pygmy whitefish may have been observed in Priest Lake, Idaho in late October.…”

Section: Reproductionmentioning

confidence: 99%

“…Twenty-eight percent of age 1 females were mature, 90 percent of age 2 females were mature, and all older females were mature. The presence of developing eggs in the ovaries of mature females (mature eggs in abdominal cavity) indicated females spawn in consecutive years (Weisel et al 1973). In Lake Superior, Michigan, more than 50 percent of males were mature at age 2 and more than 50 percent of females were mature at age 3 (Eschmeyer and Bailey 1954).…”

Section: Reproductionmentioning

confidence: 99%

“…In Brooks and South Bay Lakes, Alaska more than 95 percent of age 2 pygmy whitefish were mature (Heard and Hartman 1966). Weisel et al (1973) considers the small size and early maturation age of pygmy whitefish as a survival adaptation during glaciation when waters were cold and very low in nutrients.…”

Section: Reproductionmentioning

confidence: 99%

“…Three females were age 4 and averaged 16.5 cm (6.5 in) total length. One age 3 male measured 13.2 cm (5.2 in) total length (Weisel et al 1973). The oldest and second largest pygmy whitefish to date is a 9 year old 27.1 cm (10.7 in) female collected from Maclure Lake, British Columbia (McCart 1965).…”

Section: Age and Growthmentioning

confidence: 99%

“…In Flathead Lake, Montana, chironomid larvae and pupae were the main food source, followed by crustaceans (mainly cladocerans). During spawning, pygmy whitefish consume their own eggs (Weisel et al 1973). The diet of pygmy whitefish in Chester Morse Lake consisted primarily of chironomids, small clams, amphipods and zooplankton (R2 Resource Consultants 1995).…”

Section: Foraging and Foodmentioning

confidence: 99%

See 4 more Smart Citations

Egg Development Timing for Riverine Spawning Pygmy Whitefish (Prosopium coulterii)

Barnett¹,

Paige²

2012

Northwest Science

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Section: Reproductionmentioning

confidence: 99%

Section: Reproductionmentioning

confidence: 99%

Section: Reproductionmentioning

confidence: 99%

Section: Age and Growthmentioning

confidence: 99%

Section: Foraging and Foodmentioning

confidence: 99%

See 3 more Smart Citations

Egg Development Timing for Riverine Spawning Pygmy Whitefish (Prosopium coulterii)

Barnett¹,

Paige²

2012

Northwest Science

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The biology of pygmy whitefish, Prosopium coulterii, in a closed sub-boreal lake: spatial distribution and diel movements

Zemlak¹,

McPhail

2006

Environ Biol Fish

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Using gillnets and trap nets, we examined the spatial distribution, diel movements, and environmental tolerances of pygmy whitefish, Prosopium coulterii, in a small boreal lake in north-central British Columbia. Most gillnets were set below the thermocline but we also fished a shore net in the littoral zone. During the ice-free season (May to November) there was a strong diel onshore-offshore movement: during the day pygmy whitefish were offshore and below the thermocline (water temperatures of 4-6°C) but at night they were inshore and above the thermocline (water temperatures of 12-18°C). This onshore-offshore movement occurred close to the bottom and, regardless of where they were caught, most fish were < 4 m off the bottom. Oxygen concentrations in most of the hypolimnion dropped to < 5.0 mg l )1 in June and by late August to < 1.0 mg l )1 ; indicating pygmy whitefish can tolerate low oxygen conditions. The catch of pygmy whitefish in gillnets set below the thermocline was highly skewed: 53% of the nets were empty, 37% caught 18 or less fish, and 10% caught 70% of the total catch (742 fish). Trap nets produced similarly skewed results: most trap net sets caught no pygmy whitefish but one set caught over 2,000 individuals. Our catch data suggest that in Dina Lake #1 some pygmy whitefish aggregate.

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Growth and Morphometry of Four British Columbia Populations of Pygmy Whitefish (Prosopium coulteri)

McCart¹

1965

J. Fish. Res. Bd. Can.

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A comparison is made of the growth, morphometry, age at maturity, food, and depth distribution of pygmy whitefish (Prosopium coulteri) in four British Columbia lakes. In Tacheeda and Cluculz Lakes where the species is of the usual dwarfed variety, the fish exists sympatrically with two other whitefishes, the mountain whitefish (Prosopium williamsoni) and the lake whitefish (Coregonus clupeaformis). These slow-growing pygmy whitefish differ markedly in morphometry and depth distribution from the "giant" pygmy whitefish of McLeese and Maclure Lakes which live in the absence of other whitefishes. The possibility that differences in the populations might be due to interspecific competition is discussed.

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Observations on the Pygmy Whitefish, Prosopium coulteri, from Bull Lake, Montana

Cited by 10 publications

References 0 publications

Egg Development Timing for Riverine Spawning Pygmy Whitefish (Prosopium coulterii)

Egg Development Timing for Riverine Spawning Pygmy Whitefish (Prosopium coulterii)

The biology of pygmy whitefish, Prosopium coulterii, in a closed sub-boreal lake: spatial distribution and diel movements

Growth and Morphometry of Four British Columbia Populations of Pygmy Whitefish (Prosopium coulteri)

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