Morphology of the liver of the brook lamprey, Lampetra lamottenii before and during infection with the nematode, Truttaedacnitis stelmioides, hepatocytes, sinusoids, and perisinusoidal cells

Abstract.—There are 11 lamprey species in Canada: Vancouver lamprey Entosphenus macrostomus (formerly Lampetra macrostoma), Pacific lamprey Entosphenus tridentatus (formerly Lampetra tridentata), chestnut lamprey Ichthyomyzon castaneus, northern brook lamprey Ichthyomyzon fossor, silver lamprey Ichthtyomyzon unicuspis, river lamprey Lampetra ayresii, western brook lamprey Lampetra richardsoni, Alaskan brook lamprey Lethenteron alaskense, American brook lamprey Lethenteron appendix (formerly Lampetra appendix), Arctic lamprey Lethenteron camtschaticum (formerly Lampetra camtschatica), and sea lamprey Petromyzon marinus. Entosphenus and Lethenteron were previously synonymized with Lampetra, but Nelson (2006) recognized these as three distinct genera. Conservation status has been assessed in only five species and in two of these (western brook lamprey and chestnut lamprey), only for portions of their Canadian population. The 2007 Committee on the Status of Endangered Wildlife in Canada list indicates that the enigmatic population of western brook lamprey in Morrison Creek, British Columbia, is endangered; the Vancouver lamprey in British Columbia is threatened; the chestnut lamprey in Saskatchewan and Manitoba is special concern; the northern brook lamprey in Manitoba, Ontario, and Quebec is of special concern in the latter two provinces and data deficient in the former; and the Alaskan brook lamprey in the Northwest Territories is data deficient. The threats to the four species at risk were collectively related to habitat degradation and loss, sensitivity to a catastrophic event, and sensitivity to lampricide used to control the invasive sea lamprey in the Great Lakes basin. Despite much lamprey work being conducted in the past decade, there still remain a number of knowledge gaps. These gaps include unequivocal evidence as to whether parasitic and nonparasitic members of a paired species should be considered distinct species and information on the distribution and population sizes and trends of the native lamprey species.

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The effect of rapid and sustained decompression on barotrauma in juvenile brook lamprey and Pacific lamprey: Implications for passage at hydroelectric facilities

Fisheries Research ◽

10.1016/j.fishres.2012.06.001 ◽

2012 ◽

Vol 129-130 ◽

pp. 17-20 ◽

Cited By ~ 25

Author(s):

Alison H. Colotelo ◽

Brett D. Pflugrath ◽

Richard S. Brown ◽

Colin J. Brauner ◽

Robert P. Mueller ◽

...

Keyword(s):

Pacific Lamprey ◽

Brook Lamprey

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An attempt to differentiate sympatric Ichthyomyzon ammocoetes using meristic, morphological, pigmentation, and gonad analyses

Canadian Journal of Zoology ◽

10.1139/z07-032 ◽

2007 ◽

Vol 85 (4) ◽

pp. 549-560 ◽

Cited By ~ 12

Author(s):

F.B. Neave ◽

N.E. Mandrak ◽

M.F. Docker ◽

D.L. Noakes

Keyword(s):

Great Lakes ◽

Genetic Markers ◽

Intraspecific Variation ◽

Lateral Line ◽

Body Shape ◽

Morphometric Characters ◽

Brook Lamprey ◽

Diagnostic Characters ◽

Preliminary Classification

We assessed characters that could be used to differentiate ammocoetes of chestnut lamprey ( Ichthyomyzon castaneus Girard, 1858), northern brook lamprey ( Ichthyomyzon fossor Reighard and Cummins, 1916), and silver lamprey ( Ichthyomyzon unicuspis Hubbs and Trautman, 1937). We sampled ammocoetes of the three species from 25 streams around the Great Lakes. Existing genetic markers were used to identify chestnut lamprey for this study, but the lack of genetic markers for silver and northern brook lampreys forced our preliminary classification of these two species to be based on stream-specific catch records of adults. Comparison of ammocoete gonads was inconclusive as a technique to distinguish between these two species. Other characters examined (including pigmentation patterns, morphometric characters, body shape, and myomere counts) varied significantly among species, but were inadequate for use as diagnostic characters because of high intraspecific variation and overlapping ranges. Chestnut lamprey ammocoetes were sometimes distinguishable by their pigmented lateral line organs, but this character was not always apparent. The lack of distinguishing characteristics makes existing taxonomic keys misleading for identifying Ichthyomyzon lamprey larvae.

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Novel “omega muscle units” in superficial body-wall myotomes during metamorphosis in the northern brook lamprey (Ichthyomyzon fossor)

Canadian Journal of Zoology ◽

10.1139/cjz-2019-0051 ◽

2019 ◽

Vol 97 (12) ◽

pp. 1218-1224

Author(s):

J.E. Anderson ◽

A. Cunha ◽

M.F. Docker

Keyword(s):

Body Wall ◽

Muscle Fibers ◽

Swimming Behavior ◽

Body Wall Muscle ◽

Small Satellite ◽

Brook Lamprey ◽

Swimming Efficiency ◽

Filter Feeders ◽

Adult Lamprey

Lampreys transform from sedentary filter feeders to more mobile adults through a dramatic metamorphosis that includes remodeling of head muscle and skeletal systems. Metamorphic modifications of body-wall myotomes that could support changes in swimming behavior from larvae to adults have not been previously reported. Thus, transverse sections of northern brook lamprey (Ichthyomyzon fossor Reighard and Cummins, 1916) in larval (n = 4), metamorphosing (n = 3), and adult (n = 2) stages were used to investigate the architecture of body-wall muscle and to detect whether Pax7 and MyoD, proteins important in myogenesis, were co-localized in any muscle nuclei. In addition to myotomal complexity of muscle units composed of parietal and central fibers, there was a novel pattern of omega-shaped muscle units with curves of muscle fibers in the superficial mid-body myotome in metamorphosing lamprey. Small satellite-like cells were identified on central fibers in metamorphosing and adult lamprey muscle using routine histology and immunolocalization of Pax7 and MyoD with antibodies that specifically detect mammalian and teleost proteins. Transient “omega muscle units” may be a marker for impending myotomal growth and increasing swimming efficiency during maturation, possibly restricted to metamorphosis. Finding satellite-like cells suggests that Pax7 and MyoD may have distinctive roles in lamprey myogenesis.

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Early Spawning by the American Brook Lamprey (Lethenteron appendix) in Southeastern Minnesota

The Canadian Field-Naturalist ◽

10.22621/cfn.v126i3.1361 ◽

2013 ◽

Vol 126 (3) ◽

pp. 204 ◽

Cited By ~ 3

Author(s):

Philip A. Cochran ◽

Mark A. Ross ◽

Thomas S. Walker ◽

Trevor Biederman

Keyword(s):

Climate Change ◽

Water Temperature ◽

Thermal Regime ◽

Historical Data ◽

Upper Midwest ◽

Brook Lamprey ◽

The Mean

Record-setting warm temperatures in the upper Midwest during early 2012 resulted in early spawning by the American Brook Lamprey (Lethenteron appendix) in southeastern Minnesota. American Brook Lampreys in a total of five streams in three drainages spawned up to one month earlier than typical. Mean day of year of spawning groups observed in 2012 was significantly different from the mean for groups observed during the period 2002–2010, but mean water temperature was not significantly different. Limited historical data are not sufficient to show an effect of climate change on spawning phenology because some data are confounded with the effects of latitude and year-to-year variability in thermal regime.

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