Folder
ROOT
_ScienceBase Catalog
__US Fish and Wildlife Service (USFWS)
___Archive
____Pacific Region, Region 1
_____Pacific Lamprey Data Clearinghouse
______Biology
Abstract Pacific lamprey (Entosphenus tridentatus) is a First Food of Native Americans. Declines in lamprey abundance due to dam construction and habitat loss have curtailed traditional harvest opportunities. Artificial propagation is an emerging recovery tool for this imperiled species, and other lamprey species in Finland and Japan. To manage disease risk at prospective lamprey hatcheries, it is critical to understand the pathogens and parasites most likely to affect lamprey and other fish, both in culture and in the wild. We assembled data from regional fish health laboratories to assess pathogen prevalence in Pacific lamprey sampled from various sources (518 adults, 275 larvae, and one juvenile). In adults,...
Sexually immature, adult river lamprey Lampetra fluviatilis in the upstream migratory phase, were shown to be attracted to water conditioned with ammocoete larvae when tested using a two-choice flume. Although preliminary, the data suggest that migrating adult river lamprey may be attracted to larval putative pheromone as recorded in sea lamprey Petromyzon marinus.
EXECUTIVE SUMMARY Pacific lamprey (Lampetra tridentata) has significantly declined along the Oregon coast and in the Columbia River Basin (Downey et al. 1993; Close and Jackson 2001). Declines in adults can be partially attributed to hydroelectric dams, which have impeded passage of adult Pacific lamprey in the Columbia and Snake rivers (Moser et al. 2002), thus effecting larval recruitment in the basin (Moser and Close, in press). Adult Pacific lamprey also declined in numbers in the Umatilla River, a tributary of the Columbia River (Close and Jackson 1999). In addition to hydro power dams in the Columbia River, habitat alterations and chemical treatments have been involved in the collapse of Pacific lamprey populations...
EXECUTIVE SUMMARY This document is the 1998 annual progress report for studies of Pacific lampreys (Lampetra tridentata) conducted by the Confederated Tribes of the Umatilla Indian Reservation (CTUIR), Columbia River Inter-Tribal Fish Commission, and University of Minnesota (U of M). Bonneville Power Administration (BPA) funded activities through Project 94-026. The Pacific Lamprey Research and Restoration Project began after completion of a status report of Pacific lamprey in the Columbia River in 1995. The project started as a cooperative effort between the Confederated Tribes of the Umatilla Indian Reservation (CTUIR), Columbia River Inter-Tribal Fish Commission (CRITFC), and Oregon State University (OSU). Lamprey...
EXECUTIVE SUMMARY Pacific lampreys (Lampetra tridentata) in the Columbia River Basin (CRB) are believed to have declined to only a remnant of their population prior to human development, and actions are currently being considered for their recovery (Close et al. 1995). Identifying biological factors that may limit lamprey production in the CRB is critical for their recovery, and while some biological information for this and sympatric species [the western brook lamprey (L. richardsoni) and the river lamprey (L. ayresi)] is available from studies in Canada (Pletcher 1963, Beamish 1980, Richards 1980, Beamish and Levings 1991), little is known about the biology of lampreys in the CRB. In order to identify biological...
EXECUTIVE SUMMARY Pacific lamprey (Lampetra tridentata) has significantly declined along the Oregon coast and in the Columbia River Basin (Downey et al. 1993, Close and Jackson 2001). Declines in adults can be partially attributed to hydroelectric dams, which have impeded passage of adult Pacific lamprey in the Columbia and Snake rivers (Moser et al. 2002), thus effecting larval recruitment in the basin (Moser and Close in press). Adult Pacific lamprey also declined in numbers in the Umatilla River, a tributary of the Columbia River (Close and Jackson 2001). In addition to hydro power dams in the Columbia River, habitat alterations and chemical treatments have been involved in the collapse of Pacific lamprey populations...
Recently, there has been concern over the decline of the Pacific lamprey, Lampetra tridentata, in the northwestern United States. However, effective management has been impeded by data gaps in basic biology, especially in the early life stages. Consequently, in 2004 and 2005 I examined reproductive ecology, larval recruitment, and lamprey monitoring methods in the South Fork Coquille River, a coastal Oregon stream. In Chapter 2 I monitored spawning populations at large (9.2 km) and small (focal area) scales. Relationships between adult counts at the two spatial scales and adult and redd counts at the large scale were analyzed. Weekly adult, redd, and carcass counts and tagging were also used to describe spawning...
Within this chapter, we summarize information about Pacific lamprey gathered from relevant peer-reviewed literature and data regarding fish passage collected at Columbia and Snake river hydroelectric projects. The information and data help us to describe the life history, distribution, and habitat and water quality requirements of these fish. Historically, Pacific lamprey are thought to have occurred throughout the Columbia and Snake river basins, mirroring ranges of migrating salmon. As with other anadromous species, hydroelectric development on the Columbia and Snake rivers has hindered upstream migration of adult lamprey. Pacific lamprey are poor swimmers, and adults tend to have difficulty successfully migrating...
River lamprey (Lampetra ayresl') metamorphose in late July with downstream migration occurring in the following year from May to July. Once adults enter salt water they begin to feed immediately by consuming chunks of flesh primarily from herring and young salmon. From June until September they increase in size by an estimated 11-14 cm and 12-18 g. [n 1975, 667 (XX) lamprey were estimated to be in the Strait of Georgia resulting in the deaths of60 000- (XX) juvenile fish. Between September and late winter river lamprey return to freshwater. Spawning occurs in the spring, from April to June and adults die after spawning. The length of adult life from the onset of metamorphosis until death following spawning is 2...
Relationships among the 18 extant species of parasitic lamprey (Petromyzontiformes) were determined using a cladistic analysis of 32 mainly morphological characters. Because previous analyses support all known fossils as phylogenetically older or the same age as living lampreys, a composite agnathan fossil was used as an outgroup. A consensus of three equally parsimonious trees revealed a trichotomy between a monophyletic northern hemisphere clade and the southern hemisphere genera Geotria and Mordacia. The monophyletic status of the northern hemisphere lampreys and their classification in a single family Petromyzontidae was corroborated. It is suggested that the two southern hemisphere lamprey genera be retained...
