Identification of Larval Pacific Lampreys ('Lampetra tridentata'), River Lampreys ('L. ayresi'), and Western Brook Lampreys ('L. richardsoni') and Thermal Requirements of Early Life History Stages of Lampreys. Amended Final Report 2002-2004

摘要

Documenting the distribution and relative abundance of lampreys in tributaries of the Columbia River will help identify factors limiting lamprey populations, identify areas in need of rehabilitation, and help assess the efficacy of management actions. Surveys of larval lampreys may provide an effective means of determining the distribution and abundance of lampreys since larvae are readily collected from rearing areas by electrofishing (Richards et al. 1982). However, within the Columbia River Basin, larvae of different species often have sympatric or partially overlapping distributions. Therefore, to accurately estimate lamprey distribution and abundance it is necessary to be able to positively identify larvae to the species level. Richards et al. (1982) developed descriptive keys for identifying larvae of lampreys found in British Columbia, Canada.