Metamorphosis of the mountain brook lamprey Ichthyomyzon greeleyi

1988 ◽  
pp. 45-54 ◽  
Author(s):  
F. William ◽  
H. Beamish ◽  
Trudy E. Medland
Keyword(s):  
Brook Lamprey

Biology of the southern brook lamprey,Ichthyomyzon gagei

1982 ◽  
Vol 7 (4) ◽  
pp. 305-320 ◽  
Author(s):  
F. William ◽  
H. Beamish
Keyword(s):  
Brook Lamprey

Biology, Management, and Conservation of Lampreys in North America

2009 ◽  
Keyword(s):  
British Columbia ◽  
Conservation Status ◽  
Sea Lamprey ◽  
Great Lakes Basin ◽  
Brook Lamprey ◽  
The Status ◽  
Lethenteron Camtschaticum ◽  
Special Concern ◽  
Data Deficient ◽  
Lamprey Species

<em>Abstract</em>.—There are 11 lamprey species in Canada: Vancouver lamprey <em>Entosphenus macrostomus</em> (formerly <em>Lampetra macrostoma</em>), Pacific lamprey <em>Entosphenus tridentatus</em> (formerly <em>Lampetra tridentata</em>), chestnut lamprey <em>Ichthyomyzon castaneus</em>, northern brook lamprey <em>Ichthyomyzon fossor</em>, silver lamprey <em>Ichthtyomyzon unicuspis</em>, river lamprey <em>Lampetra ayresii</em>, western brook lamprey <em>Lampetra richardsoni</em>, Alaskan brook lamprey <em>Lethenteron alaskense</em>, American brook lamprey <em>Lethenteron appendix</em> (formerly <em>Lampetra appendix</em>), Arctic lamprey <em>Lethenteron camtschaticum</em> (formerly <em>Lampetra camtschatica</em>), and sea lamprey <em>Petromyzon marinus</em>. <em>Entosphenus</em> and <em>Lethenteron</em> were previously synonymized with <em>Lampetra</em>, 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.

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

2012 ◽  
Vol 129-130 ◽  
pp. 17-20 ◽  
Author(s):  
Alison H. Colotelo ◽  
Brett D. Pflugrath ◽  
Richard S. Brown ◽  
Colin J. Brauner ◽  
Robert P. Mueller ◽  
...  
Keyword(s):  
Pacific Lamprey ◽  
Brook Lamprey

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

2007 ◽  
Vol 85 (4) ◽  
pp. 549-560 ◽  
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.

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

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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