Iowa DNR
BioNet
River & Stream Biological Monitoring
Fish and Benthic Macroinvertebrate Surveys
Physical Habitat Assessments

Beaver Creek Lake Mills (REMAP #84)

Fish Session #2081

Sample Date
9/16/2020
Timeframe
0950-1010  
Reach Size
799 ft
Method
Standard Wadeable
Sample Quality
Poor
Last Update
3/5/2021 9:14:08 AM

Fish Health

# DELTs
0
# Non-DELTs
0

Equipment

Backpack Shockers
1
Blocknets
0
Property Access Notice

This site is on privately-owned land. The DNR obtains permission from the landowner(s) prior to conducting any sampling surveys.

FIBI Score
15
Warm Water
Poor
Session Comments

Filamentous algae, macrophytes, and heavy silt all impaired electroshocking greatly.

Collected Fish

Identity verification status for this species
Size Class: Typically only collected for sportfish
Taxa excluded from species count metrics.
Click on species name for more information about that species
Species Catch
Brook Stickleback
Latin: Culaea inconstans
Family: Gasterosteidae
Tolerance: Sensitive
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
20
Bigmouth Shiner
Latin: Ericymba dorsalis
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
17
Johnny Darter
Latin: Etheostoma nigrum
Family: Percidae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
11
Fathead Minnow
Latin: Pimephales promelas
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
9
Brassy Minnow
Latin: Hybognathus hankinsoni
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Herbivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
4
Central Mudminnow
Latin: Umbra limi
Family: Esocidae
Tolerance: Tolerant
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
3

FIBI Calculation Factors

Factor Value
Drainage area (mi2) 12.7570
Log(DA) 1.1057
Total Fish 64
Fish per 500 ft 40
Total Species 6
# Excluded Taxa 0
# Exotic Species 0
# LMB-BG 0
Calculation Last Updated 2/7/2025 2:32:52 PM

Fish Index of Biotic Integrity

Metric Name Value Score
Native Species 6 3.26
Sucker Species 0 0
Sensitive Species 1 1.58
Benthic Invertivore Species 1 1.51
Top 3 Abundance Percentage 75 2.5
Benthic Invertivore Percentage 17.19 2.5
Omnivore Percentage 14.06 2.5
Top Carnivore Percentage 0 0
Lithophilous Spawner Percentage 0 0
Tolerance Index 5.7 2.5
Adjusted Catch per Unit Effort 4.38 0.44
DELT Percentage Adjustment 0 0

FIBI Score Explained

Sites that score between 0 - 25 are considered poor. Fish abundance is usually lower than normal or, if fish are abundant, the collection is dominated by a few tolerant species. The number of native fish species present is low. Sensitive species and habitat specialists are absent or extremely rare. The population is dominated by just a few ubiquitous species that are tolerant of wide-ranging water quality and habitat conditions. Pioneering, introduced and/or short-lived fish species are typically the most abundant types of fish. Fish collected at poor sites often have a higher than normal occurrence of external physical anomalies.

This location has been classified as a survey site. Survey sites are compared to reference sites within the same ecoregion. A reference site represents natural stream qualities that are least disturbed by human activities within the watershed. Reference sites are grouped by ecoregion to establish a benchmark against which these survey streams are compared.

EcoRegion Comparison

Scores for a sampling session are compared against reference sites within the same ecoregion:

Des Moines Lobe

This site is in the Des Moines Lobe ecoregion.

Ecoregion Map
Max 85
75th Percentile 62
Median 51
25th Percentile 38
Min 13
This Session's Score 15
Total Reference Site Samples 125
Mean 50.2
Standard Deviation 15.93