Juvenile Fish Passage Criteria Assessment Project


Project Name: Juvenile Fish Passage Criteria Assessment Project
Project Location: Warm Springs Fish Hatchery at Geyserville, CA


Project Description: During the summer and fall of 2016, project leaders will document the leaping abilities of groups of 100 juvenile steelhead (70 – 120 mm FL) at the Don Clausen Fish Hatchery at Lake Sonoma. Approximately 12 tests will be conducted including video analysis and recording. Results will be summarized in writing and presented to the Fish Passage Forum in Spring 2017. Testing methods will be similar to those used in 2014, but two key variables will be changed that were unable to be tested in 2014 due to facility limitations.  


It is well-documented that both swimming and jumping performance in salmonids is strongly influenced by water temperature. Because the hatchery has a flow-through water supply and no temperature control, only a narrow range of temperature (13C to 18C) was tested in 2014. Those temperatures do not represent the range of water temperatures encountered in the natural environment, especially in northern states and at higher elevations. In 2016, a chilled water loop will be added to the test facility and jump performance will be tested in water ranging from 5C to 13C.  It is expected that jump success over the 6-inch weir will exceed performance over the 12-inch weir under the colder water conditions.    


Juvenile jump test troughPhoto credit: NOAA.