I was out at a local pond in Lethbridge the other day. Lots of little fish rising, saw lots of BWO on the water, threw one on myself and started casting. I would get a bunch of nibbles (pretty much every cast), but the fish would never take it. Its my first year fly fishing, and I haven't ran into a situation like this before. Are they swimming up to inspect the fly, and then simply not taking it? Are they too small to swallow it enough for me to set the hook? I am just a little perplexed at the moment, looking for some advice.
In terms of the fly, I was using a size 18 BWO. The ones I was able to catch on the water were smaller, probably size 20, maybe even 22. Could that be the case? Thanks for any help!