l need a strong invisible thin fishing line for salt water and my fishing area has rocks and when l catch this fish it will head straight to the rocks and breaks the line

Braid lines r very useful when u need to keep fish from running into structures. A 50lb test braid line will be as thin as a 12lb test mono line & it does not stretch. When lines do not stretch, u will be able to pull the fish away from structures faster. Braids r quite abrasion resistant too. Braids could be very soft which could increase the chances of strikes because baits ''flow'' more freely in water. Properly kept braid lines could last a VERY long time. You can always use fluorocarbon leaders in combination with braid lines. Please keep in mind that fluorocarbon leaders r invisible only when there is light; fluorocarbon leaders will not work too well under low light conditions or very deep waters.

FYI, PowerPro makes good braids. Seaguard is a fluorocarbon leader that is not too cheap. l do not think u want to spool ur reel with Seaguard fluorocarbon line. Less expensive fluorocarbon leaders will also work; u will just need to check ur leader frequently.

Seaguar fluorocarbon is for saltwater use, it can be used for salmon in fresh water in the lower breaking strains. Grand max is the fresh water version of the line, the saltwater stuff is on a blue spool, called ''Ace Hard''

l put this answer on ur first question. It will apply for saltwater as well. Good luck.

l use Spiderwire braided line in the low-vis green color. It is very thin, but works really well. It is not as expensive as some of the other braids either. Since it has no stretch it is a lot easier to get the fish in faster before it heads to cover. I've held onto some monsters on even 10lb braid over rip-rap rocks, & it still did not break. If u want even greater invisibility use a Flourocarbon leader on it, l usually use Trilene, but with the green color u will probably be okay without it since it is so thin.

It is not likely that u would need 40lb for a 10lb fish when it comes to braided line, 20lb is going to be quite strong enough & is thinner, but if u feel u need 40lb, it will still be a lot less visible than mono & u will have better luck.

Good luck. Hope u bring him in.