Fish/Fishing

Hanging nets. Some fishnets are said to be "fishier" than others.  (Fishier means they catch more fish.) Why is this?  What is the difference in the twine, and the way the net is hung?
Nylon and sunlight. To what extent does hanging a nylon net in the sun reduce it's strength and useful life? How does this compare with the traditional methods of caring for cotton nets?
Smoking fish. Which type of wood smoke gives the best taste for eating fish: alder, birch, cottonwood, or willow? Compare these with hickory if possible.
Spearing fish. What is refraction and how does it effect spearing fish and animals un-der the surface of the water?
 
I have an idea now. 
How do I present my experiment? Go.
I don't have an idea yet. 
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