Thanks for the mention Chris.
I have been shooting salmon UW for several decades and with digital for about 1.5 decades. I have posted some of my technique shots here on WP. Basically I am using a DSLR for digital. I started with APSC (Nikon DX) then added Canon full frame as it came out first. My most used lens for salmon with the Nikon was the 10.5mm fisheye and with the Canon the 8-15mm fisheye zoom (I got one within a week of it being available!). I have only a few salmon shots done without remote control, which is of the simple 3-wire release type. I use flash for a good portion of my shots. It is very dark here (sun less than 10 degrees above horizon at true noon and it is behind a mountain) when the Coho spawn. On the plus side water gets very clear once the air is at sub-freezing temperatures!
Lots of examples on my website. The few vids I have done show shots being taken:
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