Lentic Spawning by the Pacific Lamprey, Lampetra tridentata

1987 ◽  
Vol 44 (2) ◽  
pp. 476-478 ◽  
Author(s):  
J. E. Russell ◽  
F. W. H. Beamish ◽  
R. J. Beamish
Keyword(s):  
British Columbia ◽  
Wave Action ◽  
Pacific Lamprey ◽  
Lake System ◽  
Unidirectional Flow ◽  
The Pacific ◽  
Lotic Environments ◽  
Lampetra Tridentata ◽  
Lentic Water

Anadromous Pacific lamprey, Lampetra tridentata, typically construct nests and reproduce in lotic environments. In the summer of 1984, Pacific lamprey were observed spawning in shallow lentic water in two regions of the Babine Lake system, British Columbia. Nests were subject to wave action but an obvious unidirectional flow was not observed.

Recent Colonization of a Major Salmon-Producing Lake in British Columbia by Pacific Lamprey (Lampetra tridentata)

1984 ◽  
Vol 41 (2) ◽  
pp. 278-285 ◽  
Author(s):  
Susan P. Farlinger ◽  
Richard J. Beamish
Keyword(s):  
British Columbia ◽  
Sockeye Salmon ◽  
Oncorhynchus Nerka ◽  
Nursery Area ◽  
Commercial Fishery ◽  
Rock Slide ◽  
Pacific Lamprey ◽  
Natural Lake ◽  
Lampetra Tridentata

Pacific lamprey (Lampetra tridentata) were first observed in Babine Lake, the largest natural lake wholly contained in British Columbia, in 1963 and are currently found along approximately 15% of the length of the lake near the outlet. The number of spawning adults in 1982 was estimated to be 7281. Since Babine Lake is a major nursery area for sockeye salmon (Oncorhynchus nerka), the colonization of this lake by a parasitic lamprey is of concern, particularly if the species can become nonanadromous. The colonization may be beneficial if a commercial fishery can be sustained and if the species does not begin to feed in freshwater. The reason for the recent colonization is unknown but it coincides with increased human manipulation of fishes and habitat, including the removal of a major rock slide, 65 km downstream of the lake.

Extinction of a Population of Anadromous Parasitic Lamprey, Lampetra tridentata, Upstream of an Impassable Dam

1989 ◽  
Vol 46 (3) ◽  
pp. 420-425 ◽  
Author(s):  
R. J. Beamish ◽  
T. G. Northcote
Keyword(s):  
British Columbia ◽  
Life History ◽  
Young Adult ◽  
Age Determination ◽  
Dam Construction ◽  
Pacific Lamprey ◽  
High Incidence ◽  
Adult Lamprey ◽  
Lampetra Tridentata

The construction of dams on the outlet of Elsie Lake, in British Columbia, prevented young adult Pacific lamprey (Lampetra tridentata) from going to sea and adult lamprey from spawning above the dams. This resulted in a high incidence of lamprey attacks on resident trout that was initially interpreted as indicating that the lamprey population was landlocked. This study showed that a landlocked population of lamprey was not established. The attacks on fish occurred for only a brief period each year. Attacks on trout stopped approximately 7 yr after dam construction. Because this was the average estimated age when ammocoetes metamorphosed and scarred fish or ammocoetes were no longer found, we concluded that metamorphosed lamprey were unable to survive to maturity. The inability to establish a landlocked population indicated that the transition from an anadromous parasitic life history type to a freshwater parasitic life history type did not occur as quickly or as easily as previously suggested. The study also provided evidence that the statolith method of age determination may provide accurate ages.

Identification of putative migratory pheromones from Pacific lamprey (Lampetra tridentata)

2011 ◽  
Vol 68 (12) ◽  
pp. 2194-2203 ◽  
Author(s):  
Sang-Seon Yun ◽  
Andrew J. Wildbill ◽  
Michael J. Siefkes ◽  
Mary L. Moser ◽  
Andrew H. Dittman ◽  
...  
Keyword(s):  
Bile Acid ◽  
Columbia River Basin ◽  
State Agencies ◽  
Liquid Chromatography Mass Spectrometry ◽  
Pacific Lamprey ◽  
Petromyzonamine Disulfate ◽  
Petromyzosterol Disulfate ◽  
Petromyzonol Sulfate ◽  
The Pacific ◽  
Lampetra Tridentata

Pacific lamprey, Lampetra tridentata , has declined precipitously throughout their range in the Columbia River basin of North America. Tribal Nations and Federal and State agencies are engaged in efforts to restore these fish. Understanding whether Pacific lamprey emit and detect migratory pheromones is particularly important for these restoration efforts. Using behavioural assays, we demonstrated that migratory adult Pacific lamprey are attracted to odors emanating from their larval conspecifics. We then identified putative pheromones released by larval Pacific lamprey. Chemical analysis of the conditioned water from larval lamprey using liquid chromatography – mass spectrometry (LC–MS) revealed that the Pacific lamprey can release petromyzonamine disulfate (PADS), petromyzosterol disulfate (PSDS), and petromyzonol sulfate (PZS). Electro-olfactogram studies further demonstrated that adult Pacific lamprey can smell those bile acid compounds. Our data strongly indicate that the Pacific lamprey employ a chemical communication system mediated by a mixture of bile acids, as evidenced by pheromonal functions of the bile acid compounds in guiding migratory adult sea lamprey to the spawning streams. Comprehensive understanding of the chemical communications involved in lamprey migratory behavior may lead to improved scientific approaches for restoration efforts.

Nutritional Condition of the Pacific Lamprey (Lampetra tridentata) Deprived of Food for Periods of Up to Two Years

1993 ◽  
Vol 50 (3) ◽  
pp. 591-599 ◽  
Author(s):  
John N. C. Whyte ◽  
Richard J. Beamish ◽  
Norma G. Ginther ◽  
Chrys-Ellen Neville
Keyword(s):  
Nutritional Condition ◽  
Maintenance Energy ◽  
Fatty Acid Profiles ◽  
Lipid Levels ◽  
Pacific Lamprey ◽  
Spawning Areas ◽  
The Pacific ◽  
Endogenous Reserves ◽  
Adult Lamprey ◽  
Lampetra Tridentata

The anadromous parasitic Pacific lamprey (Lampetra tridentata) does not feed during metamorphosis or its spawning migration. To assess the utilization of body reserves, we compared the compositions of an adult lamprey held for 2 yr without food, recently metamorphosed lampreys, and lampreys starved for 6 mo. Moisture was higher and soluble ash and lipid levels were lower in tissue of the 2-yr-starved than in metamorphosed lampreys (2.67 and 3.39 kj∙g−1, respectively). Fatty acid profiles of 2-yr-starved and metamorphosed lampreys were qualitatively similar except for the presence of 15:0 in the latter. Substantially lower levels of 14:0 and 16:1 n7 and higher levels of polyunsaturated fatty acids occurred in starved lampreys. Changes in composition of lampreys starved for 6 mo were similar to changes between the 2-yr-starved and metamorphosed lampreys. Maintenance energy in a normalized 1-g lamprey starved for 6 mo was derived from catabolism of 71% lipid and 29% protein; total loss was 2.56 kJ or 49% of the original energy. The ability to survive extended periods on endogenous reserves, which may have allowed L. tridentata to survive past environmental catastrophes, allows it to migrate considerable distances to spawning areas in the headwaters of rivers.

Responses to rapid temperature change in the Pacific lamprey (Lampetra tridentata)

1985 ◽  
Vol 63 (5) ◽  
pp. 1027-1032
Author(s):  
Daniel E. Lemons ◽  
Larry I. Crawshaw
Keyword(s):  
Metabolic Effects ◽  
Mean Body Temperature ◽  
Thermal Biology ◽  
Pacific Lamprey ◽  
The Pacific ◽  
Rapid Temperature ◽  
Flow Through ◽  
Calorimetric Studies ◽  
Peripheral Temperature ◽  
Lampetra Tridentata

Some aspects of the thermal biology of the Pacific lamprey (Lampetra tridentata) were studied by making rapid changes in the ambient water temperature (Ta). Calorimetric studies were conducted to determine the rate of ensuing changes in mean body temperature [Formula: see text] and various deep body temperatures. Cardiovascular–respiratory alterations were evaluated in an experimental flow-through apparatus in which Ta could be rapidly shifted while changes in ventilation frequency (fV) and heart rate (fH) were recorded. Immediately following a step increase in Ta, the change in [Formula: see text] of a 0.21-kg lamprey was 33% complete in 33 s and 67% complete in 127 s. Deep dorsal muscle temperature changed much more slowly, being 33% complete in 87 s and 67% complete in 225 s. During rapid shifts in Ta, fV and fH changed at a significantly greater rate than would be predicted taking into account the change in [Formula: see text] and the resultant Q10 effects on metabolism. This effect persisted when the [Formula: see text] of the water was held at 600 Torr (1 Torr = 133.322 Pa). A possible interpretation of the results is that lampreys, like other water-breathing vertebrates, sense alterations in peripheral temperature and utilize this information to alter the output of the ventilatory and cardiovascular systems in a way that anticipates some of the metabolic effects of temperature.

Experiments on Oral Secretion of the Rocky Mountain Wood Tick, Dermacentor andersoni Stiles (Acarina: Ixodidae)

1957 ◽  
Vol 89 (1) ◽  
pp. 1-5 ◽  
Author(s):  
J. D. Gregson
Keyword(s):  
British Columbia ◽  
Pacific Northwest ◽  
Rocky Mountain ◽  
Dermacentor Variabilis ◽  
Oral Secretion ◽  
Amblyomma Maculatum ◽  
Dermacentor Andersoni ◽  
The Pacific ◽  
Tick Paralysis ◽  
Rocky Mountain Wood Tick

Tick paralysis continues to be one of the most baffling and fascinating tickborne diseases in Canada. It was first reported in this country by Todd in 1912. Since then about 250 human cases, including 28 deaths, have been recorded from British Columbia. Outbreaks in cattle have affected up to 400 animals at a time, with losses in a herd as high as 65 head. Although the disease is most common in the Pacific northwest, where it is caused by the Rocky Mountain wood tick, Dermacentor andersoni Stiles, it has lately been reported as far south as Florida and has been produced by Dermacentor variabilis Say, Amblyomma maculatum Koch, and A. americanum (L.) (Gregson, 1953). The symptoms include a gradual ascending symmetrical flaccid paralysis. Apparently only man, sheep, cattle, dogs, and buffalo (one known instance) are susceptible, but even these may not necessarily be paralysed.

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