"Drew Cutter" wrote in message
...

Why only a single hook ?

? Only artificial flies or lures with a single hook may be used.

It's the law. Otherwise, I couldn't say, except that they might consider
that trout aren't as likely to survive being hooked by a treble hook. Trout
are especially sensitive fish.

Artificial flies are for fly fish only streams.

Artificial lures are fly fish or spinning rod fishing.

Op