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> ...it's always kind of awkward to hold a slimy fish in one hand and a camera in the other.

If you put the camera on a tripod pointing down, you free up a hand. This would also potentially let you set up a white background with a ruler to show how large the fish is.

Taking this to extremes, if you have sufficiently high-end equipment you could tether the camera to a tablet (probably powered by a large battery pack, because it will need to be always on and run the screen fairly bright) and operate it by nose on touchscreen. For a lower tech approach, it should be possible to find a remote trigger which can be fired with a foot pedal.