Premium
A Trap for Handling Adult Anadromous Salmonids at Lower Granite Dam on the Snake River, Washington
Author(s) -
Harmon Jerrel R.
Publication year - 2003
Publication title -
north american journal of fisheries management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 72
eISSN - 1548-8675
pISSN - 0275-5947
DOI - 10.1577/m02-035
Subject(s) - fish migration , rainbow trout , fishery , trap (plumbing) , oncorhynchus , fish <actinopterygii> , environmental science , hydrology (agriculture) , spring (device) , geology , biology , engineering , geotechnical engineering , environmental engineering , mechanical engineering
During the winter of 1995 and spring of 1996, the trapping facility in the fish ladder at Lower Granite Dam on the Snake River was modified to create a system that permits processing large numbers of adult fish while minimizing stress caused by handling. This was accomplished primarily by incorporating a gravity‐flow dewatering system into the trap. Adults passing up the fish ladder can be sampled randomly or with the use of diversion systems that sample for coded wire or passive integrated transponder tags. About 13% of the 1,060,059 adult Pacific salmon Oncorhynchus spp. and steelhead O. mykiss that passed through the facility from 1996 through 2001 were diverted for various research collections and observations.