You never know about those tuna. They eat just like us. Sometimes we want a big steak, a greasy Mexican dinner, Italian food, Oriental food, hamburger,....etc. They normally hit a jig that gives out a signal like the bait they are feeding on at the time.
The biggest YF I ever saw hit a jig, hit a little 4 oz diamond jig that was coated with a luminous rubber coating. That jig was also being cranked in as fast as possible with a jerk motion. That same jig caught three YF's over 100 pounds that night. The tuna were also only at a 75 foot depth when they hit.
I truly believe that a glow jig or at least a partial glow jig works best if fishing at depths of 150 feet or more. Don't be afraid to send it down 300 to 500 feet. From what I've seen the tuna at these great depths like a very slow retrieve if any retrieve at all. Just bouncing it a little or lifting your rod will do the trick.
Remember, tuna go deep to cool off. When their body temperature gets high, they slowly sound downward to cool off. They aren't as active at deep depths as they are nice and cool. Hell, I don't want to move when I'm in front of a nice air conditioner combined with a ceiling fan on full blast.
They do this about four times in a twenty-four hour period. They hunt the whole water column up and down durning their depth cycle. That's why sometimes you see a top water bite only last for an hour. They get hot slowly retrieve back down to cool off. It you see a topwater bite that goes on for hours, it's because the water temperature is comfortable for them up top. That's one reason why the GOM has the hottest top water bite in late Oct to late Dec.
Current plays a big part in jig selection. That's a big factor. If the tuna are deep with a heavy current, big out the 500gr jigs and hope they get down.
On those days or nights with no or little current a smaller jig in 150-200gr works great. I'm tired of typing, so that's my two cents for this Friday afternoon.
