Don't know about hali's,but I can tell you that you won't catch salmon in the dark. I commmercial trolled back in the
late 80's/early 90,s and my skipper was as hard core as they get. Up at 4 am every morning and the gear down before
the crack of dawn. Not once in 5 years of fishing did we ever get our first fish of the day until there was some sort of
discernable light. Likewise in the evening, we would troll until it was pitch black out. I remember many nights when the
bite was on and the coho were nailing every hook we had down. The instant the sun went over the horizon, " some of
the most incredible sunsets I,ve ever seen in my life!!",the fish would stop biting. It was like someone had thrown a
switch or something. Never ceased to amaze me!