Hey rm, those larvae look to be fairly large, have you tried using any for bait? I used some over at my neighbor's pond last week and the BG hit them hard. I used a #6 hook, a bb sized split shot and a small bobber. Once I found a school the action was very fast. On one cast I had a moment where I thought the bobber had lost it's flotation because when it hit the water it sank immediately. It only took a second to realize that a fish was responsible.
That was the first time I used BSFL as bait rigged correctly and they're irresistible to fish. You don't thread them on the hook like a worm because you want to let them wiggle freely. Use a small hook and barely nick the back end of the larvae leaving the hook exposed. The fish don't care about the hook apparently. I used a red hook but I doubt it makes much difference. In the UK and AU maggots are a favorite bait and they're very common in bait stores, like worms are here I think. You can put multiple larvae on the hook if you like. In my one experience so far there was no such thing as a nibble, just a disappearing bobber.
If you want the larvae to be more buoyant you can soak them in water for a while I hear.
