Scientists monitor the gravel composition and levels of dissolved oxygen in the creek

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.

Photo Location: Alaska, Juneau
Photo Date: 1999