Testing Adult Pacific Lamprey Performance at Structural Challenges in Fishways

Autor:	Christopher A. Peery, William R. Daigle, Steven R. Lee, Howard T. Pennington, Mary L. Moser, Matthew L. Keefer
Rok vydání:	2010
Předmět:	Ecology biology Lamprey Entosphenus tridentatus Management Monitoring Policy and Law Aquatic Science Water velocity biology.organism_classification Fishery Pacific lamprey Weir Test performance Lampetra tridentata Ecology Evolution Behavior and Systematics Geology
Zdroj:	North American Journal of Fisheries Management. 30:376-385
ISSN:	1548-8675 0275-5947
Popis:	Adult Pacific lampreys Lampetra tridentata migrate through areas of difficult passage and high water velocity by attaching their oral discs to substrate and then releasing and bursting upstream. In fishways at dams, this burst-and-attach behavior can be ineffective, particularly where suitable attachment surfaces are unavailable. We used an experimental fishway to test performance of adult Pacific lampreys when confronted with a series of structural challenges. These included vertical steps near fishway weir orifices, squared versus rounded orifice entrances, and floor-mounted metal grates. All experimental challenges simulated common existing structures in weir-and-orifice fishways at Columbia and Snake River dams. Most experiments were paired with field evaluations of radio-tagged Pacific lampreys or video observations of untagged individuals in situ. Field and experimental results consistently indicated that the structural challenges reduced passage efficiency and lengthened passage times. Imp...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ef01d14c0b4e95df765122025dad1df1 https://doi.org/10.1577/m09-099.1 Zobrazit plný text záznamu Plný text