You need a long-handled, large hooped, deep net. We have successfully netted fish near 80 inches in these size nets with little problem. I use 30-lb. Not too heavy, not too light. Be sure to check the last few feet of your line after every fish for abrasions and nicks.
Sturgeon like to roll up in the line.
If you find any damage, cut the bad part out and retie. I mentioned an anchor release earlier. There are several ways to do this. I clip this to the bitter end of my anchor rope which has a loop. It is all set up as not to catch on anything when deployed.