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Troutnut's Fly Fishing for Trout: Blog is a photographic shrine to trout, fly fishing, beautiful rivers, the fascinating flies we imitate, and how to match the hatch for every common species in North America. It is run by "Troutnut" Jason Neuswanger with help from many others.

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As of this August, it's Dr. Troutnut!

By Troutnut on November 26th, 2014, 9:23 pm
I didn't post much to the site this year because I was very busy finishing my Ph.D. at the University of Alaska Fairbanks and immediately starting an exciting post-doc. I defended my dissertation in June and graduated in August, and my dissertation was finally published online recently. Anyone curious what I've been up to in Alaska can download it from ProQuest as a free PDF here:

New 3-D video methods reveal novel territorial drift-feeding behaviors that help explain environmental correlates of Chena River Chinook salmon productivity

The long-winded title results from my doing four chapters on seemingly separate topics that deeply connect to each other in detail. Overall, my dissertation is about understanding what processes and environmental variables control the success of salmonids--both individuals and entire populations. I directly studied juvenile (fingerling) Chinook salmon, but many of the results are likely to apply to trout, grayling, and any other stream fishes that engage in drift feeding (i.e. holding a stationary feeding position in the current and darting back and forth to intercept items of food).

Details of my dissertation

Chapter 1 is about technology, especially a computer program I developed (called VidSync) that makes it possible record fish with a pair of video cameras and then quickly make thousands of measurements of the fish, their environment, and their behavior. The chapter describes this program and the math behind it (which I didn't invent from scratch, although I made some important improvements). VidSync made the next two chapters possible.

Chapter 2 is about how tiny debris in the drift affect drift-feeding fish (and it was published already in Environmental Biology of Fishes). Even crystal-clear water naturally contains a large amount of fine debris, which is difficult to notice in person but jumps out on video shot at certain lighting angles, much like the dust in the air is revealed by a lone sunbeam shining into a dark room. This debris comes from many different processes, such as the gradual breakdown of wood and leaf litter by aquatic insects and bacteria, or insects shedding their exoskeletons (exuviae) between instars (Instar: Many invertebrates molt through dozens of progressively larger and better-developed stages as they grow. Each of these stages is known as an instar. Hard-bodied nymphs typically molt through more instars than soft-bodied larvae.) or during emergence. Drift-feeding fish face the very difficult task of distinguishing between debris and food of a similar size and color. It's probably especially difficult for small fish (because there's more small debris of a similar size to their prey). Most of the foraging effort of juvenile Chinook salmon was directed at debris items they either rejected without capturing or captured and spit out. This doesn't mean they're bad at feeding--it just means they had to engage their senses of taste and touch in an important way. Even large trout are sometimes found with debris in their stomachs and observed rising to inspect inedible items... including our flies. It's a bit humbling as a fly fisherman to realize that we aren't always fooling fish into thinking our fly is food--we're basically just getting them to give it the benefit of the doubt, just like they do to countless other bits of natural flotsam.

Chapter 3 is about territoriality. Previous studies of salmonid territoriality have described fish widely spaced across a pool, with territorial boundaries that can be mapped out in 2-D (i.e., mapped from a "top view" of the pool). Juvenile Chena River Chinook salmon, at first glance, behave very differently--they feed in large, 3-D schools (meaning some fish are directly above and below others) along the edges of the river. Even though this is very different from the typical, widely spaced patchwork of 2-D territories, and even though feeding territories have never been detected within schools of fish or any other animal groups, I found that some Chinook salmon were very territorial. Some were transient, "just passing through" the school in a minute or less. Many others used strategies in between the two extremes, which haven't really been studied before.

Chapter 4 is about the effect of high stream flow on the Chena River Chinook salmon population. I analyzed 20 years of salmon run data from the Alaska Department of Fish and Game, and found that the salmon do very poorly when they experienced a high-water year in the river as juveniles. This effect is probably relevant to the broader decline of Chinook salmon throughout the Yukon River drainage in recent years, although there's also probably more to the story. Hundreds of scientists are working on bits and pieces of that puzzle, because so many people depend on those fish for subsistence in rural villages. This chapter identified an important clue, but it's not the whole story.

If you're interested in a slightly more technical explanation of these chapters and how they fit together, read the abstract in the dissertation PDF.

What's next?

The same week I turned in the final draft of my dissertation, I began remotely working as an Alaska-based post-doctoral research associate at the University of Georgia. I'm working with a top expert on drift-feeding behavior, UGA Professor Gary Grossman (who writes the "Ask Dr. Trout" column in American Angler). We're starting a 3-year project studying the mechanics of drift-feeding in juvenile Chinook salmon, as well as adult grayling, and dwarf dolly varden. My hope and expectation is that this project will greatly advance our understanding of the mechanisms that control the behavior and feeding success of drift-feeding fish.

This new project means I'll be remaining in Alaska for at least two more summers. Depending on my wife's career, we might move somewhere else for the rest of the year, but we have no specific plans yet. I'm really excited to have the opportunity to work with one of the leaders in my field while still spending summers in this amazing state and focusing on a project I helped design to follow my #1 research interest. I will try to continue to update throughout, including posting some of my intense adventures from this summer over the next couple months.

New "How to fish for grayling" video from the Alaska Dept of Fish & Game

By Troutnut on May 28th, 2014, 3:17 am
The Alaska Department of Fish & Game office here in Fairbanks does a nice job with instructional videos for the public. A while back they created a series on how to setline for burbot, and how to clean them, and now they've come out with a new video about how to fish for grayling. It nicely covers the basics for beginners to grayling or trout fishing, but non-beginners will still enjoy the shots of the Chena River and of grayling feeding underwater.

Not exactly a lunker

By Troutnut on May 16th, 2014
I drove south to North Pole in the evening to check out a couple of clear, spring-fed sloughs and try to catch a round whitefish for burbot bait. After a couple hours drifting nymphs through deep pools, I finally got one.

In the meantime I caught a dozen or so grayling. These sloughs often have good fishing during the grayling spawning run, but that seems to have ended already. I caught several small to medium grayling, but mostly the sloughs were packed full of yearling 3-inchers, for which they are a year-round nursery. They were rising like crazy to a midge hatch... fun to watch, if not to fish.

Photos by Troutnut from Piledriver Slough in Alaska

Three-inch grayling. Hundreds of fish were rising all around me to an intense midge emergence. Unfortunately, this was one of the biggest ones. From Piledriver Slough in Alaska.
Three-inch grayling. Hundreds of fish were rising all around me to an intense midge emergence. Unfortunately, this was one of the biggest ones.
Date TakenMay 16, 2014
Date AddedMay 17, 2014
CameraCanon PowerShot D10
 From Piledriver Slough in Alaska.
Date TakenMay 16, 2014
Date AddedMay 17, 2014
CameraCanon PowerShot D10

Finally, fly fishing!

By Troutnut on May 1st, 2014
In this area, the first place to catch grayling each year is also one of the least idyllic places in Alaska to fish, a spring-fed slough in downtown North Pole where many of the Chena River's grayling congregate to spawn. It runs low and clear while all the other rivers in the area are high, turbid, and still holding more icebergs than grayling. The angling pressure at popular access points looked more like the Catskills than Alaska, but I was still excited to catch my first fish in months. The grayling were abundant and eager, and I enjoyed ridiculously easy fishing on nymphs and more interesting action on dries for a couple hours before I tired of the highway buzz and the gas station scenery and headed home. Soon, water levels will drop and the real Alaska will be ready for play.

Photos by Troutnut from Badger Slough in Alaska

A decent grayling for this stream From Badger Slough in Alaska.
A decent grayling for this stream
Date TakenMay 1, 2014
Date AddedMay 2, 2014
CameraCanon PowerShot D10
First fish of 2014 From Badger Slough in Alaska.
First fish of 2014
Date TakenMay 1, 2014
Date AddedMay 2, 2014
CameraCanon PowerShot D10
 From Badger Slough in Alaska.
Date TakenMay 1, 2014
Date AddedMay 2, 2014
CameraCanon PowerShot D10

On-stream insect photos by Troutnut from Badger Slough in Alaska

The least welcome sign of spring  In this picture: True Fly Family Culicidae (Mosquitoes). From Badger Slough in Alaska.
The least welcome sign of spring

In this picture: True Fly Family Culicidae (Mosquitoes).
Date TakenMay 1, 2014
Date AddedMay 2, 2014
CameraCanon PowerShot D10

Spring break-up on the Tanana River

By Troutnut on April 26th, 2014
My wife and I checked out the Tanana for burbot this weekend, just a day or two after the Nenana Ice Classic tripod fell, indicating that the ice went out about fifty miles downstream. We found no sign of fish at the first spot we tried, which had open water with ice chunks floating around. At the second spot, we caught the ice break-up in action--a spectacular show to watch.

Videos by Troutnut from the Tanana River in Alaska

Spring break-up on the Tanana River near Fairbanks
On April 26, 2014, we caught the last of the contiguous ice across the Tanana River near Fairbanks breaking up and washing away.
LocationTanana River
Date ShotApr 26, 2014
Date AddedMay 4, 2014
CameraNikon P7700

Photos by Troutnut from the Tanana River in Alaska


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