Fish Ladder Weir Modifications to Minimize Escapement

Autor:	Michael E. Barnes, Robert P. Hanten, Eric Krebs, Dylan A. Gravenhof, Joshua M. A. Caasi, Nathan Huysman, Jill M. Voorhees
Rok vydání:	2021
Předmět:	Chinook wind biology Hydraulics biology.organism_classification law.invention Fish ladder Fishery law Weir Environmental science Oncorhynchus Fish Raceway Escapement
Zdroj:	Engineering. 13:173-183
ISSN:	1947-394X 1947-3931
DOI:	10.4236/eng.2021.134013
Popis:	A fish ladder, weir, and raceway at Whitlock Spawning Station are used to capture and retain feral fall Chinook salmon (Oncorhynchus tshawytscha) for spawning from Lake Oahe, South Dakota. Nearly 40% of the salmon ascending the fish ladder have been documented to escape from the holding raceway by descending the ladder. This manuscript describes modifications to the weir that eliminated nearly all escapements, except for an inconsequential number of small non-spawning fish. The modified design using the existing structure incorporated free-swinging, spaced steel bars with a back-stop to create a one-way gate. The modified gate does not require springs, hydraulics, or electrical power. It is relatively simple to construct and requires minimal maintenance.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a813adde78efa5ec69c36be498fb635b https://doi.org/10.4236/eng.2021.134013 Zobrazit plný text záznamu