Difference between revisions of "FISHERY"

Quick Facts

Visitor Use and Experience

• Visitor Experience as it relates to fisheries, include opportunities to fish for rainbow trout in GCNRA's Glen Canyon Reach, which has been referred to as Blue Ribbon by the State of Arizona, and to fish for rainbow and brown trout and a variety of non-native introduced fish species in the main stem Colrado River and some tributaries in GCNP. Most angling in GCNP occurs in or near Bright Angle Creek and Phantom Ranch, particularly in fall and spring (NPS 2006c)

• Definition of a Blue Ribbon fishery

• GCDAMP- Public Outreach- Lees Ferry Trout Fishery

• Lees Ferry Anglers Trout Fishery Recommendations
• State of Arizona Lees Ferry Fish Management Plan
• Lees Ferry Fishing Report

2016

• Current Status of the Lees Ferry Fishery - Spring 2016
• Brown Trout Update Lees Ferry
• Trout Ad Hoc Group Report
• Lees Ferry Recreational Trout Fishery Management Recommendations: The Voice of Lees Ferry Recreational Anglers, Guides, and Businesses
• Memo from Scott VanderKooi to TWG Chair Dated 12/9/15, Subject: Technical Review of the Lees Ferry Recreational Trout Fishery Management recommendations
• [ Natal Origins of Rainbow Trout Project, Years 1-4 (Nov 11 – Dec 15)]
• [ Bioenergetic Modeling of Glen Canyon Rainbow Trout Fishery: Exploring effects of temperature, trout population size and biomass on benthic invertebrate consumption]
• Long-Term Monitoring of the Lees Ferry Fishery: Update
• Economic value of angling on the Colorado River at Lees Ferry: Using secondary data to estimate the influence of seasonality
• Bright Angel Creek Non-Native Trout Reduction, Grand Canyon National Park
• Prey size and availability limits maximum size of rainbow trout in a large tailwater--insights from a drift-foraging bioenergetics model

2015

• Lees Ferry Recreational Trout Fishery Management Recommendations: The Voice of Lees Ferry Recreational Anglers, Guides, and Businesses
• GCMRC Science Update - Trout
• Update on the 2015 decline in fish condition and abundance at Lees Ferry
• GCMRC review of the Lees Ferry Anglers Trout Fishery Recommendations
• Management Prescription
• Mercury levels in Glen Canyon trout
• Potential Application of an Individual-Based Model to the Glen Canyon
• Glen Canyon Tailwater Fishery “Integrating Fish and Channel Mapping
• State of the Fishery Lees Ferry and Lees Ferry and Marble Canyon Rainbow Trout Update
• Lees Ferry Recreational Trout Fishery
• Lees Ferry Management Plan Update and handout
• Natal Origins of Rainbow Trout: Glen Canyon and Marble Canyon
• Drift-Foraging and Bioenergetics Growth Model for Rainbow Trout in the Lees Ferry Tailwater

2014

• New Insights on Trout from the Natal Origins Study
• Modeling Long Term Effects of HFEs on Trout and HBC
• Natal Origins update

2013

• Rainbow trout monitoring update
• Natal Origins update
• Diets of trout in Bright Angel Creek
• Nonnative fish control in GCNP tributaries

2011

• Rainbow Trout are less piscivorous than Brown Trout, but since there are more Rainbow than Brown Trout, Rainbows likely consume more native fish than Brown Trout in Grand Canyon
• Rainbow and Brown Trout disporpotionately prey on native fish

JUNE 17 , 2016

FISHING REPORT

UPRIVER REPORT 7

WALK-IN REPORT 4

SPIN REPORT 5

1 = GO ELSEWHERE 10 = GET HERE NOW!

CROWD REPORT

UPRIVER CROWD

1 WEEKDAY 2 WEEKEND

WALK-IN CROWD

1 WEEKDAY 1 WEEKEND

1 = SLEEP LATE AND FISH WHEREVER 10 = VERY CROWDED, GET UP EARLY

UP-RIVER SUMMARY If you do not follow Lees Ferry Anglers on Facebook, you should. We make several posts each week about current conditions at Lees Ferry.

On June 1, the higher summer flows began. As we had hoped, the increased water flows have improved the fishing significantly compared to the previous few months. The higher flows have stirred up the larger food items (scuds and worms) and we are seeing unusually large midge hatches. For most of the spring, the fish were holding in the deeper water and it was tough to get to them. This, coupled with our crappy spring weather, made our fishing slower than normal. Now that the water has risen, the fish are moving back into the shallower water and are much more eager to eat. The fish are in astoundingly great shape and we are catching all sizes of fish from large to small, including a 20-incher on my boat this week that weighed every bit of 4 pounds. The other good news is that we are starting to catch quite a few smaller fish (under 10-inches) which means there are younger generations of trout that are moving out of hiding and into the main channel to feed; these will be the fish that we are catching for the next few years.

The great fishing should continue throughout the summer. The cicadas are starting to sing and we’ll be making regular posts on Facebook regarding their hatches.

The best flies of recent have been scuds, worms and midges. Stop by or call the shop to get the most recent hot fly selection. Wade fishing continues to be highly productive as has been drift fishing from the boat. Weekend flows are lower and as a result the wade fishing is usually better those days.

El Nino came through in the end and provided the Lake Powell drainage with a good snowpack. The lake has risen over 20-feet and we have more to go … I’m hoping that the lake ends up 30 or more feet. The Powell’s current elevation is higher than it has been since 2012. The high inflow will also stir up nutrients that will show up in the river next winter and spring.

The river looks great with abundant algae covering most of the bottom. The algae indicate that there is a good nutrient flow from the water above the dam. These nutrients serve as the foundation for macroinvertebrates that support the food web.

The river is a living creature. Just because you caught fish in a certain spot in years past, don’t think that you are going to experience the same success this year. Fishing is changing daily. It is our goal and desire that everyone have a great trip to the Ferry. Be sure to stop by the shop to see the flies that are currently working. The flies change on a daily basis and every day LFA guides let everyone at the shop know the top producing flies and how to use them. We are anxious to share this knowledge with you – even where to fish!

There is an ongoing aquatic food base study that has taken place over the past couple of years. The purpose of this study is multifaceted and is studying the relationship of flows on food production, taking inventories of and monitoring populations of aquatic insects and invertebrates that live in the river and other very important aspects of the aquatic food base. I believe that this is by far the most important study that has ever been conducted on this river. Previously, hundreds of millions of dollars have been spent studying sediment while ignoring the aquatic food base and resource. Common sense dictates that fish, birds and animals do not live off of dirt or sand. The aquatic food base and habitat are the foundation for all that lives in the Colorado River. One of the long term goals of the food base study is to determine how to enhance the populations and production of aquatic insects in the river which will benefit native fish, trout, and migratory bird populations. This is a study and a goal that we can all embrace!

Quagga mussels have become established in Lake Powell and we are now seeing some in the river below the dam. Their arrival in the river happened sooner than I expected. So far, there has not been a major infestation and there is some thought by experts that they will not become very well established in the river due to the current. Be aware and remember to dry waders and boots before using them in any other body of water. Also, all private boats should drain all water from the boat and live-wells as soon as you exit the river. We all need to do our part to limit the transport of this and all invasive species.

WALK-IN SUMMARY We are hearing positive reports on the walk-in area. I expect the fishing to improve as the summer progresses.

SPIN FISHING SUMMARY. Spin fishing has improved greatly. For most of the spring there was so much algae that it was practically impossible to get a drift without the lure and line being clogged with algae. The higher flows that began June 1 have helped to clear this algae, so conditions have improved greatly

Bishop Study and Angler Preferences