From August 23-25, 2014, my dad and I camped out on the Richardson Clearwater to try to collect 3-D video foraging data on adult grayling using the GoPros. We found one of the only good campsites on the river, although it was well hidden.

The weather and scenery were amazing the whole time.

In addition to filming, we also caught some fish to compare diet samples with the ones we caught a month before.

The video we shot of grayling turned out to be disappointing. The fish were mostly in water fast and deep enough that it was difficult to place the cameras nearby. When we did, our presence spooked the fish, and they eventually returned to the general area but not to their specific original positions in front of the cameras. Unlike Chinook salmon I’ve filmed previously with steady success, the grayling in this stream seem to range over an area large and uniform enough that when they’re disturbed they have no strong urge to return to the same spot anytime soon.

Although this stymied our efforts to shoot good footage on this trip, it was very valuable going into the off-season before our first real field season. It told us that we need to figure out a way to place the cameras in faster, deeper water than expected (i.e. devise a new anchoring system) and that we need to find a way to keep the cameras running for a very long time, so they’re ready when the fish eventually do return to suitable positions. This is exactly the kind of thing we needed to figure out while we still have the whole winter to engineer our solutions.

August 22, 2014 was a day trip to one of our Chena Chinook study sites to test the second of our two camera systems. Much less complicated than the big Nikons we tested and troubleshot previously, the GoPros were able to shoot pretty good video right away. (My experience filming Chinook salmon also made it easier than testing the big cameras on other fish.)

I had more family visiting and enlisted my father (left) and father-in-law (right) to help assemble the 3-D video calibration frame.

We were also joined by Bill Carter from the U.S. Fish and Wildlife Service, who wanted to learn how to deploy the 3-D video system with GoPros for use on a sheefish project later in the year.

It’s great that we had so much willing help for equipment testing during this pilot field season. Next year, we will have paid technicians.

In late August of 2014 my dad, a recently retired Wisconsin DNR fish biologist, flew up to Alaska to help with a week or so of intense fieldwork. We relied on volunteers this summer because we didn’t have enough fieldwork to justify hiring a technician, but it was very valuable to have him up here and be working with the same person for several days in a row.

On August 21st, we tested our main underwater video system in a relatively deep pool in Panguingue Creek.

The system consists of a side-by-side pair of Nikon DSLRs in underwater housings, with HDMI connections wired to Atomos viewer/recorders, so we can see what the cameras are seeing at all times and make sure they’re placed correctly.

We use 2 cameras instead of 1 because the side-by-side views allow us to use 3-D video measurement methods with the VidSync software and capture the exact 3-D coordinates of every action of the fish we want to measure. To enable those measurements, we also film a calibration grid, pictured below.

We didn’t get any good fish footage out of this trip, but that’s to be expected from the first test of complicated new equipment. We did learn a great deal about the quirks and limitations of our technology, and developed a good understanding of what I would need to buy, tweak, calibrate, or hack to make everything work smoothly when we begin real data collection next summer.