Hi Senko, Yes, that is a knockoff of a Shimano butterfly jig. The only thing different is the paint job. I have a local tackle shop that gets them from China (gasp!) with different paint jobs. Shameless exact knockoff. One of their paint jobs works (for me) better than any of the Shimano paint jobs.
Fish during the day will tend to only bite much smaller presentations than the typical 300-500g jigs typically you get away with at night.
3 daytime jigs?I I fish a Phenix Megalodon paired with either a Torque40NLD2 or a 12VISX. Even then, the action can be too heavy to impart the right action on smaller jigs.
That being said I'd do 1) a speed jig like a Shimano flat side in 142 gram or 168 gram. Good for moderate drift speed to @ 200 ft +/-, 60 or 80# topshot, single hook on top. probably a 5/0 or 6/0 VMC 7264. (I make my own assist hook setups) If I could get a 120 gram speed jig down to fish at 200 ft during the day without scope, I'd do that. Being a speed jig, you need the right rod and IPT on your reel to make it work right up the water column. 1B choice would be a Zakana jig fished fast on the retrieve.
2) A "flat fall" type of jig. This term encompasses many jigs that flutter on the way down. Not my favorite, because they stop working correctly after a cerrtain depth, and that's usually still above where the fish usually are. This would be a "shallow fish" jig. A new favorite is the Shimano Wingfall. For San Diego I'd fish a 160 or 200G depending on drift. . Option 2B would be the Daiwa SK in your favorite daytime color in the 170 gram model. You can fish these with your rail rods.
3) Cant leave out the Rip Roller in whatever color you like. Smaller profile/size than the night time counterpart. This jig does have a nice maneuver on the way down, but is the fastest sinking of the 3 types I mentioned. It all depends on the depth of fish and drift speed what I'd be pulling out. Fish with a rail rod. 3B for deeper daytime fish is a KB/West Coast Jiggerz knife jig to 250G.
You know no "bite leaders" on these jigs, right? No crimped leaders, no 300lb mono leader. Short fluoro bumper to a long mono topshot, like over 75ft. The skipper will tell you 100lb topshot.
Lastly there are casting jigs, Colt snipers, etc that work during the day.
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