Like sudsy said pike use mono. They make flouro now for freshwater as line. In the past it was too stiff. Now seaguar makes something called invisx which isnt all that expensive. But for saltwater application I would use the mono. If you have the 8000 captiva it will hold 160 yards of 30 pound test.
CV4000 210/10 6.2:1
CV5000 200/12 5.2:1
CV6000 175/16 5.2:1
CV8000 160/30 4.7:1
That means the diameter of the 14 pound fireline is ~ 6 pound test.
A little bit more than braid.
You can make the approximations based on 6 pound test.