Lampreys and Lamprey Fisheries in Finland

1980 ◽  
Vol 37 (11) ◽  
pp. 1953-1959 ◽  
Author(s):  
P. Tuunainen ◽  
E. Ikonen ◽  
H. Auvinen
Keyword(s):  
Environmental Changes ◽  
Petromyzon Marinus ◽  
Sea Lamprey ◽  
Human Consumption ◽  
Fish Stocks ◽  
Brook Lamprey ◽  
Economic Significance ◽  
River Lamprey ◽  
Great Damage ◽  
Lamprey Species

There are three lamprey species in Finland. European river lamprey (Lampetra fluviatilis) is common along the coast of Finland and 28 rivers are known to support spawning populations while landlocked river lamprey populations exist in three watercourses. European brook lamprey (Lampetra planed) is common in freshwater all over the country, and sea lamprey (Petromyzon marinus) has been reported off the Finnish coast only 19 times since 1854. Food of the river lamprey and landlocked river lamprey includes valuable fish species such as herring, sprat, and vendace, but no effects on the fish stocks have been reported. River lamprey catch in Finnish coastal rivers make up about 2–2.5 million individuals (100 t) and lampreys are used only for human consumption. The fishing season begins in August and ends in February. Environmental changes in rivers (dams, pollution, etc.) have caused great damage to river lamprey populations. Successful attempts have been made to promote spawning by transporting lampreys over the dams. Landlocked river lamprey, brook lamprey, and sea lamprey are of no economic significance in Finland.Key words: sea lamprey, river lamprey, brook lamprey, distribution, Finland, life history, fisheries, management

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.

scholarly journals Hearing capabilities and behavioural response of sea lamprey (Petromyzon marinus) to low-frequency sounds

2019 ◽  
Vol 76 (9) ◽  
pp. 1541-1548 ◽  
Author(s):  
Megan F. Mickle ◽  
Scott M. Miehls ◽  
Nicholas S. Johnson ◽  
Dennis M. Higgs
Keyword(s):  
Auditory Evoked Potentials ◽  
Petromyzon Marinus ◽  
Low Frequency ◽  
Sea Lamprey ◽  
Teleost Fishes ◽  
Management Scenarios ◽  
General Increase ◽  
Hearing Ability ◽  
Sound Detection ◽  
Lamprey Species

Hearing ability is well studied across teleost fishes in general, and vertebrates more broadly, but little is known about sound detection abilities of lampreys (Petromyzontiformes), a basal extant vertebrate group. The sea lamprey (Petromyzon marinus) is a destructive invader of the Laurentian Great Lakes, while numerous lamprey species (including the sea lamprey) are imperiled in their native ranges. In both management scenarios, behavioral manipulation tactics to control movement and distribution are desired. Therefore, we describe the hearing ability and behavioral responses of adult and juvenile sea lamprey to sound to reveal how hearing may have evolved in vertebrates and determine possible management applications. Based on auditory evoked potentials, sea lamprey detected tones of 50–300 Hz with equal sensitivity, but did not detect sounds above 300 Hz. In a laboratory bioassay, sea lamprey behaviorally responded to sound range of 50–200 Hz, with a general increase in swimming and a decrease in resting behaviours at both juvenile and adult stages relative to no-sound controls. To our knowledge, this is the first test of lamprey hearing, and the results support that sound may be a means to modify lamprey behaviour for management purposes.

Changes in the Distribution of Native Lampreys in Lake Superior Tributaries in Response to Sea Lamprey (Petromyzon marinus) Control, 1953–77

1980 ◽  
Vol 37 (11) ◽  
pp. 1872-1885 ◽  
Author(s):  
R. J. Schuldt ◽  
R. Goold
Keyword(s):  
Endemic Species ◽  
Chemical Control ◽  
Drainage Basin ◽  
Lake Superior ◽  
Petromyzon Marinus ◽  
Sea Lamprey ◽  
Brook Lamprey ◽  
Habitat Temperature ◽  
Sea Lampreys

Populations of three species of lampreys, American brook lamprey (Lampetra lamottei), northern brook lamprey (Ichthyomyzon fossor), and silver lamprey (I. unicuspis), endemic to the Lake Superior drainage basin have declined since chemical control of the sea lamprey (Petromyzon marinus) was begun; 64% (103 of 162) of the streams inhabited by endemic species have required treatment. The parasitic silver lamprey was most adversely affected by lampricide applications. Though 4278 were captured at 35 of 55 Lake Superior barriers in 1959, a total of 91 were reported in only nine tributaries and the St. Marys River from 1973 to 1977. American brook lampreys were least affected by chemical control and have disappeared from 6 of 42 treated streams which they inhabited. Ichthyomyzon larvae are no longer found in 41 of 81 treated streams they once inhabited, though few larvae were found in many of these streams. Several factors affected the vulnerability of native lampreys to chemicals. Nonparasitic lampreys, especially American brook lampreys, inhabited headwater areas which were often not invaded by sea lampreys, but silver lampreys spawned in lower reaches and their entire stream distribution was exposed to the effects of the lampricide. Differences in fecundity of lampreys also affected their recovery after chemical treatments.Key words: Ichthyomyzon fossor, ichthyomyzon unicuspis, Lampetra lamottei, streams, distribution, habitat, temperature, fecundity, survival, TFM

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