This week, my guest is guide and author Matt Supinski [51:36], one of the most innovative thinkers in fly fishing with a long history in the business. The topic is selectivity, which Matt wrote an entire book about a few years ago. What is selectivity in fish feeding, is it always operating, why does it happen, and how can we use it to our advantage when fishing? It's a fascinating topic and one Matt and I explore in depth.

In the Fly Box this week, we have some great questions and comments, including:

Do longer rods roll cast better than shorter ones? And do slower rods roll cast better?

Can I use one of those yarn practice rods to fine tune my double haul?

Why can I only find lead split shot? Isn't it bad for the environment?

Who were your "media heroes" when growing up?

Do the vibrations from car-top rod carriers damage rods?

A listener takes me to task for suggesting people use a throat pump to see what trout are eating.

Why do trout sometimes not respond to heavy hatches?

The smallmouth bass in my local streams are quite small. Why don't they grow bigger?

How can I catch trout in a small stream that runs into a local pond?

What can I do to make stripers on the flats take my flies? They keep following but don't commit.

Why do fly shop employees get paid such a low wage?

Does green-colored tippet material offer any advantage?

How can I improve my dexterity and efficiency when tying knots on the water?

Can I use a reel suitable for an 8-weight line on my 5-weight rod?