Leech Lake Update 7/31/2006

FROM:
Walker Area Fisheries Office
07316 State Hwy. 371 NW
Walker, MN 56484
218-547-1683

Greetings!

This is the first periodic update we are sending to Leech Lake area resorts, businesses, and others interested in DNR activities on Leech Lake. The goal of these messages is to keep you up to date with our findings and our current activities on the lake. It has been a busy year to this point, and our annual sampling is just getting started. Below is a summary of the major points of interest.

Double-crested cormorants
To date, nearly 3,000 cormorants have been culled on Leech Lake. Major control efforts are over for the year, however, 20 additional birds will be taken per week for the cormorant diet study. The U.S. Fish and Wildlife Service approved the taking of 7,400 cormorants for the state of Minnesota. Up to 4,000 cormorants from Leech Lake may be taken. Currently, there are approximately 1,900 cormorants on Leech Lake. Two graduate students continue their work on 1) quantifying what cormorants eat on Leech Lake and 2) relating the diet work back to the fishery (what does it mean for Leech Lake fish populations).

Stocking
Earlier this year, volunteers helped DNR staff stock more than 22 million walleye fry. At the time, these fish were the size of mosquito larvae. Now, eleven weeks later, stocked and wild walleye are approaching five inches in length. In addition to walleye fry, the Leech Lake Division of Resource management raised 206,000 walleye frylings. With help from the Walker Office, these fish were stocked the last week of June. Walleye frylings are larger than fry and smaller than fingerlings. All stocked walleye were marked with a chemical (called oxytetracycline) that identifies them as either fry-stocked or fryling-stocked. By marking these fish, we can estimate the hatch of wild fry and determine the stocking contribution to the 2006 walleye year class.

Shoreline Seining
On July 10, we started sampling for young-of-the-year walleye and yellow perch using a long net called a shoreline seine. This standard assessment work gives us our first look at the new year class and so far, what we are seeing is encouraging. We sample at five stations around the lake and all have young walleye present. Their abundance and average size are good signs for a strong year class. Trawling (a purse-like net pulled behind a boat) in mid-August will provide more information. Some trawling two weeks ago for a walleye diet study found a number of walleye from the 2005-year class already 10 inches in length. With two more months to grow this year, anglers can expect the 2005-year class to reach "keeper" sizes sometime next summer.

Rusty Crayfish
Rusty crayfish are an invasive exotic species to Minnesota and Leech Lake. Native to the Ohio and Tennessee River valleys, they were likely brought to this area by anglers for use as bait. There is concern that rusty crayfish are eating walleye eggs in large enough numbers to reduce the number of hatching walleye. Late this winter, the MN DNR and Bemidji State University started research to address what impacts rusty crayfish may have on Leech Lake walleye. Laboratory work found rusty crayfish are active at water temperatures that walleye spawn in and also revealed most activity occurred at night. Divers from the MN DNR and Cass County Dive Team counted crayfish along likely walleye spawning shoals to estimate their density. Later this summer, a graduate student will further this research at Bemidji State University.
Rusty crayfish are known to impact fish populations, especially bass and panfish. Here are three Minnesota lakes that have high densities of rusty crayfish. It appears the bass/panfish populations in these lakes are decreasing, yet, the walleye are numerous.

1. Eagle's Nest #3

2. Newfound Lake

3. Sucker Lake

Of Interest
While seining near Five Mile Point, we caught a larger than normal fish. A muskellunge feeding in the shallow waters found its way into our net. This is the third time I have sampled muskie in a seine. The fish was photographed and released to continue feeding in the warm, shallow water. It’s possible this fish hatched on the nearby spawning habitat that was protected by the land purchase and creation of Five Mile Point Aquatic Management Area (AMA). Conservation efforts such as this certainly go a long way to protecting Leech Lake fish populations, habitat and water quality.


If you have questions or comments, please contact:
Pat Rivers (pat.rivers@dnr.state.mn.us) 218-547-1683
or
Harlan Fierstine (harlan.fierstine@dnr.state.mn.us) 218-547-1683

Strong "year class" for Leech Lake Walleye

Good news. Early indicators point to a very successful young-of-the-year walleye population in Leech Lake as the Walker Fisheries conducts shoreline seine sampling. Click here for the full story.

Lake Level Low

According to the Army Corps of Engineers "Leech Lake Dam and Reservoir" web site, the lake water level is currently at 1294.11 feet, which is roughly where the water level was in April.

For you history buffs, here's some statistics from Jan. 1, 1965 through May 13, 2004:

* Highest Recorded: 1296.09 ft., June 16, 2001
* Lowest Recorded: 1292.69 ft., Nov. 25, 1976
* Recorded Range: 3.4 ft.
* Average Water Level: 1294.33 ft.
* Ordinary High Water Level Elevation: 1294.90 ft.

This means we're about 0.2 ft. below average and 0.8 ft. below the ordinary high water level. You don't need to tell that to my neighbor John Newman. He knows there's a problem because he couldn't get his boat out of the boatlift because the water level was so low.

And there doesn't seem to be much rain in the forecast for the Leech Lake area to help the situation. Between today and early August, there is only a slight chance of some isolated thunderstorm activity. Not nearly enough to fill our beautiful lake.

July 4th Fishing Report

A lot to report from my recent visit to Leech Lake's Sucker Bay.

While my Memorial Day week visit to the lake was mostly a bass and walleye affair, my July 4th week visit was almost exclusively a perch-focused event. And quite successful.

I want to thank my neighbor and fishing buddy John Newman, and his family of fishing fanatics, for finding 'the birches,' a veritable hot-bed of jumbo perch activity.

For days the wind was blowing out of the West pushing baitfish and other aquatic edibles into the weeds in 8-10 feet of water in front of 'the birches.' The preferred method for fishing the jumbos was seining Leech Lake minnows (mostly emerald shiners) and using them to bait slip-bobber rigs, Northland Gum-Ball jig heads, Northland Mimic Minnow Spins, and Johnson Beetle Spins. The results were nothing short of incredible! Dozens of jumbo perch were caught during a 3-4 day period, culminating in a wonderful Shore Lunch fish fry for dinner on July 4th. What a fantastic way to celebrate America's 230th birthday.

Unfortunately, the wind shifted just after July 4th and the perch fishing slowed considerably. I also experienced a meltdown of various marine equipment. First, both my aft and fore livewells stopped working, and then my MinnKota PowerDrive trolling motor died. Both malfunctions will be dealt with during the winter.

On our final day at the lake for this visit, my beautiful wife Kathleen (with whom I just celebrated 25 years of marriage) caught a very nice jumbo perch while we were casually drifting in the boat while watching another gorgeous Leech Lake sunset.

All in all, a great visit to Leech Lake.