Chena River Chinook Salmon Study

Here’s some salmon video footage superior to what was posted a few months ago. These clips were shot in the last few weeks.

First, some adult Chinook resting on their way up the North Fork of the Chena:

Juvenile Chinook feeding:

Juvenile Chinook versus the shockwave from an airboat:

All the videos are much lower-quality than the originals due to YouTube’s high file compression. To get a sense of the original HD video, here are some full-resolution stills captured from the HD video. Click a picture to see it full-sized.

Adult Chinook in the North Fork of the Chena, with a grayling and a whitefish in the foreground.

Juveniles foraging in the North Fork:

And in the main stem Chena:

Each of these videos and stills comes from a pair of side-by-side Sony HDR-SR12 video cameras in underwater housings with special wide-angle ports. Using two fixed cameras and some calibration equipment allows us to analyze the positions of these fish in 3D on the computer. That enables us to precisely measure their lengths, feeding positions, spacing, and many other scientifically interesting attributes.