I was surfs casting at Sur Bundar nesr Gwadar. I lost my fish and line. The fish dragged the 50 lb braided line with immence speed and never stopped till the line was completely exhausted and snapped but the fish didn't stop traveling towards deep sea. This happened twice and snapped my line. I am considering to use my heavy 8ft rod around 100lb line on my reel next time. What is advised under such circumstances. I was using a steel wire leader with a bottom rig with round sinkers. Any idea which species of fish can do this

There are lots of fish that could do that. Shark of course is the first to come to mind.

Many years ago I was fishing in a small lake on the south coast NSW. 12lb line with the drag fully locked. I was not expecting anything more than a small bream or flathead. I was using half prawn for bait. I was sitting on the sand and holding the rod. Something took the bait and it hit so hard and fast that it lifted me off the ground. In 1 maybe 1 1/2 seconds it was all over, the line snapped. But it lifted me to almost a standing position.

If you have or can get or borrow an Alvey, try that. With an Alvey your main drag is your palm. So you use the palm of your hand to control the drag. Casting and rigging is a little different but very easy to learn. You can use braid on an Alvey but you will need to use a finger guard. You can make one from some leather gloves or your local chemist or hospital will have some to give or sell to you.

An 8 foot rod would be difficult to cast off a beach and even harder with 100lb line (even braid).

A friend advised me that I should use 35lb line instead to have greater length of line on my reel to control the long run of the fish, What is your opinion?

I have heard of this theory before...

I have several doubts about it...

Get a bottle of about 2 litres and fill it with water. See how long you can hold it at arms length ! Your arm will start to drop within 30 to 60 seconds. Fish are no different.

It is not the line class that counts, it is your use of the drag. The more line you have out the weaker the line becomes. The more line out, the less control you have. The more line out, the more important drag control is.

Using thinner line and therefore more line on the reel, will just result in the same thing...snapped line or stripped spool.

So my opinion. What your friend says has some merit. I don't agree. What your friend says is logical but in my opinion it is a false logic. Just because I do not agree with your friend does not take away the merit of what your friend is saying.

If I may make a suggestion. I know many anglers would cringe at this. Go back to basics and target the small fish. Use 10 or 12 lb line and let those little fish have their head and use the drag to control them. Once you have the skill to control a 4 inch bream, you can control a 40 inch snapper!!

what about just using a bigger reel with a super high drag? - then the fish can't spool you anymore.
I'd use some gear that they use to catch a marlin

What kind of reel have you got at the moment?
I once caught a big kingfish with a tiny reel and it almost spooled me.
But because I was fishing from a kayak it was dragging me and the kayak around for a while and I managed to land it without breaking the line or reel. It was a pretty close call though.

Anyway - I would think a stronger reel is better than a weaker line.

Hope you'll get another chance to to fight a fish like this and bring it in next time.
Sounds like it could be the catch of a lifetime and it would be really interesting to know what it was.

First day I was using a Ryobi 6000, after I was stripped, the next I tried my luck with Penn Btl 8000, when I could see the line getting completely exhaustede I tried to further tightened the drag slightly and the 50lb line snapped