I just purshased the diawa saltiga jigging rod med- heavy weight. 6' ( 210- 300 gram) for fishing for seabass near wrecks. I have heard that these rods can handle tuna... does anyone know if Is there any truth to this statement? or should I go with the heavey weight rod ?
Can't comment on the diawa rod, but a friend of mine in the canaries did a 270kg (600ish lb) Blue Marlin on a Shimano Jigrex and Stella 20,000 loaded with 80lb braid a couple of seasons ago. I would say if you are a half good angler and can use a rod and reel the way they are ment to be used you shouldn't have to much trouble. That is unless you intend on going after giant bluefin in 1000 fathoms! What Tuna species and how big are a factor here.
One thing to remember is that when fishing gear to its limmits its always better to have a reel that can deal with the preasure put on it. I have caught some big fish on cheep, light rods, and snapped them, but still caught the fish. If the reel fails on you, it doesn't matter how good the rod is - game over!
in general, the new generation of "jigging" rods reflects some pretty amazing stuff -- much lighter than in the past but rated for amazing strength -- largely because they're designed for braided lines ... same reels that used to mean, say, 30# mono on rods this size now means more like 80# braid (same diameter or less). so mfrs like daiwa, shimano, accurate, finnor/vanstaal, penn and others now offer rods using this technology, typically running $100-250 or so.