lateral lines maybe?

wrote in message
ups.com...
I'm not disagreeing. But if this is true, then why
are blue and purple such popular colors for west
coast salmon flies? Or can salmon see purple,
but trout not?

Also, what about blue? Is there a difference between
a trout's blue and a trout's purple?

Interestingly, purple plastic worms are a hot soft
bait for bass fishermen too.