Caught my first bass using a wacky rig!

[Drop the Bass]

Today I caught my first fish using a wacky rig. I've caught bass before, but not on a wacky rig, I was just starting to lose all hope in senkos. I was using a watermelon 5" senko w/ black and red flakes. It was about 10 or 11 inches and maybe a pound or less, but it put up a nice fight.

However, when fishing a senko wacky rigged, how do I know when a fish takes it? This time, I kind of saw my line go straight and move and I tried to set the hook (I thought the senko was just sinking to the bottom of the river).

But how would you know when a bass takes your senko?

Thanks.