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NOAA Photo Library Image - r0003017

Scientists monitor the gravel composition and levels of dissolved oxygen in the creek. The process requires the insertion of plastic pipes into the streambed at a depth where fish eggs are found. The scientists use an oxygen probe to measure the levels of dissolved oxygen and measure the cleanliness of the gravel to determine suitability of the riverbed as spawning habitat.

Image ID: r0003017, NOAA's Restoration Center Collection
Location: Alaska, Juneau
Photo Date: 1999
Credit: NOAA Auk Bay Lab, K Koski

High Resolution Photo Available

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Last Updated:
November 10, 2017