Gill Netting For Salmon

I bought a fair bit (300 yardsX5feet) of 5" gill net. Can I catch
salmon with this on a fairly big river with salmon running up it? I
was thinking of stringing 100lb mono through the top of the net, and
tying the mono to each bank. I have made about 40 leads, each about
4oz. Will this arrangement work? I'm thinking of leaving it out for a
day, will it be packed full of salmon? Would my arrangement and net
size hold all the salmon? The salmon which run up the river go up to
about 30lb normally. Would that size of salmn be capable of ripping
the net apart? The line in the net is 0.7mm, that's about 15lb
strenght. Also, when I empty the net, will most of the salmon be dead?

Thanks, I've googled this alot, but I could not find much of any use.

By the way, gill netting is legal where I am, but no-one does it
anymore.