In a true survival situation, going fishing is probably not the most effective or efficient means of gathering enough food to survive off of.

I find that there are alternatives where legalities become a luxury, so would suggest the following, all of which I've tried in the past with desirable results:

Dupont spinners
Rotenone
The magneto from an old crank phone

The best one was the magneto. If you can get out in the water and insulated from it (like a boat), then the magneto is fairly discrete and localized enough that, when applied,you simply reach over and scoop up what floats to the surface. Nice and quiet, no spectacle, and fairly portable.

In survival mode, I don't tend to worry quite so much about sticking to the rules. You do what you gotta do.