Airburst system blows out the crappie at US hatchery

摘要

Maintaining facilities and upgrading them to current standards is an on-going challenge for older hatcheries. Often, major refits are necessary, as was the case for Oregon's Oxbow Fish Hatchery when it was time to enhance their water intake screeningsystem.Oxbow Hatchery was originally built in 1961 by the Idaho Power Company. The hatchery is part of efforts to mitigate the blocking of salmon and steelhead passage up the Snake River by the Companies Hells Canyon hydro electric dams.Water is provided to the hatchery by two 75hp (56 kW) intake pumps that draw water from the Snake River. "Originally, the river pumps had no screening system," explains hatchery manager Jeffrey Seggerman. "Probably about 10 years ago, a course bar system, with 2-inch (5cm) gaps, was added to filter out large objects that could damage pump impellors."