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 : Annual Report 2001.

[摘要] Lampreys inhabit temperate regions in both the northern and southern hemispheres. Typically, lampreys spawn in fresh water streams where, after hatching, larval lampreys (ammocoetes) burrow into soft substrate and spend an extended larval period filtering particulate matter from the water column. During this larval period, lampreys are characterized by greatly reduced subcutaneous eyes, reduced fins, unidirectional flow of water from the mouth through the gill pores for filter feeding, and the absence of tooth-like keratin plates (the structure most often used to differentiate lamprey species). After approximately three to seven years (Hardisty and Potter 1971a) lampreys go through a metamorphosis marked by drastic physiological and morphological changes. The resulting juvenile lampreys exhibit fully developed eyes, fins, and characteristic dentition patterns.

[发布日期] 2002-01-01 [发布机构] United States. Bonneville Power Administration.

[关键词] Lampreys - Columbia River Watershed - Larvae - Counting;Particulates;Juveniles;Metamorphosis;Feeding