|Nearest Town: Florence
Primary County: Lyon
Survey Date: 06/25/2012
Inventory Number: 42007000
|Did you know? Spawning habitat improvements can enhance naturally reproducing populations of fish species such as walleye and northern pike.|
|Species||Number of fish per net||
Average Fish Weight (lbs)
Normal Range (lbs)
|Black Bullhead||Trap net||0.38||1.5 - 58.0||1.10||0.2 - 0.5|
|Gill net||0.33||7.7 - 104.7||0.09||0.2 - 0.5|
|Bluegill||Trap net||5.00||3.5 - 57.1||0.39||0.1 - 0.3|
|Channel Catfish||Gill net||0.33||N/A||7.28||N/A|
|Common Carp||Trap net||0.25||0.4 - 2.4||4.74||1.8 - 5.1|
|Gill net||1.00||0.8 - 4.3||4.17||1.0 - 4.0|
|Smallmouth Bass||Gill net||1.00||N/A||0.30||N/A|
|Walleye||Trap net||5.88||0.3 - 0.8||0.69||0.9 - 3.5|
|Gill net||7.67||0.8 - 3.8||0.48||1.4 - 3.0|
|White Sucker||Trap net||1.25||0.2 - 1.2||2.49||1.3 - 2.5|
|Gill net||2.67||0.5 - 2.3||1.95||1.6 - 2.5|
|Yellow Perch||Trap net||0.88||0.4 - 2.8||0.35||0.1 - 0.2|
|Gill net||6.33||2.0 - 22.3||0.49||0.1 - 0.2|
|Species||Number of fish caught in each category (inches)|
|For the record, the largest Rock Bass (tie) taken in Minnesota weighed 2 lbs. and was caught: |
Statistics: 12.6" length, 12.4" girth
Fish Stocked by Species for the Last Ten Years
|1 - indicates fish purchased and stocked by private citizens and sporting groups.|
|2 - indicates fish purchased by the DNR for stocking.|
|Stocking Fish Sizes|
|Fry - Newly hatched fish that are ready to be stocked usually called "swim-ups". Walleye fry are 1/3 of an inch or around 8 mm.|
|Fingerling - Fingerlings are one to six months old and can range from a size of one to twelve inches depending on the species. Walleye fingerlings range from three to eight inches each fall.|
|Yearling - Yearling fish are at least one year old. A one-year-old fish can range from three to twenty inches depending on the species. Walleye yearlings average from six to twelve inches.|
|Adult - Adult fish are fish that have reached maturity. Depending on the species, maturity can be reached at two years of age. Walleye reach maturity between the ages of four and six years.|
Minnesota DNR Fisheries classifies lakes with similar characteristics, such as size, depth, water chemistry, etc. on a statewide basis for comparison of data. East Twin Lake is located south of Florence in Lyon County, has a surface area of 352 acres, a maximum depth of 23.6 feet, transparency depth of 2.9 feet, and is in lake class 38. It is managed primarily for smallmouth bass and walleye, and secondarily for yellow perch. The lake has no outlet, and water levels have steadily risen since the 1980's to a historical high on June 1, 2012 of 15.0 feet above the "ordinary high water mark". A new county owned public access was completed in the fall of 2010 to replace the former DNR access which was submerged. Night electro-fishing for smallmouth bass to assess their status was completed on May 14, 2012. A fish population assessment utilizing 3 gill nets and 8 trap nets was conducted during the week of June 25, 2012 with the following results.
The lake provides a unique opportunity for anglers to target smallmouth bass, being one of only two lakes managed for smallmouth bass in southwest Minnesota. The smallmouth bass electro-fishing catch per hour was 45 fish in 2012 compared to 102 fish per hour in 2008, and only 7 fish per hour in 2004. Although the catch rate of smallmouth was about half compared to 2008, the age group frequency and size structure are still excellent. Forty fish that were aged by counting growth rings on scales, six age groups present. One 20 inch smallmouth that was not aged likely represents an additional age group indicating excellent natural reproduction. The only stocking of smallmouth bass in East Twin Lake was the initial introduction of 8,000 fingerlings in 2002. Test netting data indicates the smallmouth bass population is well-balanced with very good growth, and contains fish across a variety of sizes from 4 to nearly 20 inches. Fishing for smallmouth bass in East Twin Lake should be very good for the next several years, and some trophy fish may be present!
East Twin Lake has a history of abundant yellow perch populations; unfortunately catch rates in gill nets have steadily declined from a high of 87 fish per net in 1992 to the most recent catch of 6 fish per net in 2012. Trap net catch rates have also declined since 1996 from a high of 6 fish per net to the most recent catch of 1 fish per net in 2012. Although numbers have dropped significantly, they are still in the normal range for lakes similar to East Twin Lake. Lengths of yellow perch from both net types ranged from 5 to 12 inches, with adequate numbers of spawning sized fish available to reproduce in the future. One year of successful reproduction could return their numbers to the levels observed in the 1990's. Fishing for yellow perch in East Twin Lake will be hit-or-miss over the next 2 to 3 years. It would be better to go across the road to West Twin Lake to fish for yellow perch, if that is what you are after.
Walleye catch rates for gill nets were 8 fish per net which was just above the long term average of 6 fish per net for this lake. Numbers of walleye sampled in trap nets was at a historical high of 6 fish per net in 2012, which is five times the long term average for East Twin Lake. Although walleyes were quite abundant, the sizes of the fish in the sample were smaller with zero fish larger than 15 inches caught in either net type. Twenty four walleye were aged by counting annual growth rings on an internal bony structure called an otolith. There were three year classes present; ages 1, 3, and 4. These year classes all correspond to walleye fry stockings in 2008 (age 4), 2009 (age 3), and 2011 (age 1) suggesting limited natural reproduction. While the current outlook shows that the population is dominated by small fish, the future outlook is promising. In 2 to 3 years there will be many fish larger than 15 inches in the lake, if survival is good in East Twin Lake, because there are 3 solid age groups currently in the lake.
Although not managed in East Twin Lake, bluegill sunfish catch rates in trap nets were at a record high with 5 fish per net sampled in 2012. Their length frequency distribution appears to indicate four age groups are present with fish ranging from 4 to 11 inches long suggesting good natural reproduction. Due to the diverse size structure, abundance, and healthy condition of bluegill, consideration may be given to adding them to the list of species managed by the DNR in the future if habitat conditions improve, such as abundant aquatic vegetation.
Other fish species sampled in this assessment in low densities included channel catfish, common carp white sucker, and black bullhead. Fourteen painted turtles were also documented within the 8 trap net sets.
To maintain a healthy fishery in East Twin Lake; all citizens need to promote Best Management Practices (BMP's) within the watershed to help reduce nutrients entering the lake. High nutrients accumulating in the sediments in a lake can cause algae blooms and reduce water clarity. Any improvements in the way of natural drainage in the watershed (non-tiled drainage to mimic natural wetland drainage) will help the fish community through increased water quality and water clarity.
Prepared by Chuck Obler
|For more information on this lake, contact:||Lake maps can be obtained from:|
For general DNR Information, contact:
DNR Information Center
500 Lafayette Road
St. Paul, MN 55155-4040
TDD: (651) 296-6157 or (888) MINNDNR
Turn in Poachers (TIP):
Toll-free: (800) 652-9093