Autumn On The EB

Autumn On The EB

Friday, April 8, 2022

Why The Bivisible And The Rivers

The solubility of oxygen in water is inversely proportional to temperature, decreasing as the water gets warmer. It dissolves as water comes into contact with air, and with the agitation caused by turbulence. In the early Spring, when the water is cold, there's is plenty of oxygen and fish can be anywhere, but as the water warms fish move to cold spots and to places just below rapids and riffles where the oxygen supply is replenished." - Thomas Ames, Jr.


First, I really don't like this fly EXCEPT under one condition: choppy, fast water. This is one of my pre-hatch searching flies that I use in the very early evening. It's ability to ride the waves high and dry is all that I ask it to do. The Ames quote above explains this. During the warm season trout look for high oxygen environments and that means riffles and that means a dry fly that will not sink.  As dusk approaches the trout leave the riffles and take up positions in the pools and runs.  That's when I'll switch to a comparadun because under these conditions the bivisible isn't as effective.


Size 12 with hackles that are somewhat oversized
does the trick.

I occasionally use this fly in a size 18 or smaller but there are better choices.

The Rivers

Everything was fine yesterday but....

EB - 387 and rising
Ware - 277 and rising
Swift - 348 and rising
Millers - 744 - going crazy
WB of the Westfield - 2230 and out of control (I fished it yesterday when it was at 100 cfs)
Mill River- 110 yesterday, 1150 now
Things will get better!!

Ken









5 comments:

Anonymous said...

I've used this fly in tiny sizes at the Y Pool where a few twitches will bring the trout up (sometimes).

GW

Paul Fay said...

Was going to mention the same thing!

Paul Fay said...

Ken happy to report some blue line success. I checked out a Miller's trib today with limited time and was able to fool two gorgeous male brookies from the same pool. (20 steps from the road) Each over 10 inches and very fat bellies trophy natives in my book. Both fish took an olive jig style bugger size 10 fished on the bottom. Miller's look really blown but I did see some folks suiting up in the parking at the train tracks for the kempfield section

Anonymous said...

Even better, use a Crackleback!

Millers River Flyfisher said...

Good work Paul. The blown out Millers is because of the water held back for the canoe race.

Anonymous,
That would work!

Ken