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

Beaver Creek Akron

Fish Session #1476

Sample Date
8/12/2013
Timeframe
1338-1425  
Reach Size
614 ft
Method
Standard Wadeable
Sample Quality
Fair
Last Update
1/18/2017 8:36:21 AM

Fish Health

# DELTs
0
# Non-DELTs
0

Equipment

Backpack Shockers
1
Blocknets
2
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
36
Warm Water
Fair
Session Comments

Turbidity was slow to clear after bug sampling due to minimal flow. Overhanging vegetation allowed many fish to escape capture.

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
Creek Chub
Latin: Semotilus atromaculatus
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Generalist
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
82
Fathead Minnow
Latin: Pimephales promelas
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
55
Western Blacknose Dace
Latin: Rhinichthys obtusus
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
41
White Sucker
Latin: Catostomus commersonii
Family: Catostomidae
Tolerance: Intermediate
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
5
Bigmouth Shiner
Latin: Ericymba dorsalis
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
3
Southern Redbelly Dace
Latin: Chrosomus erythrogaster
Family: Leuciscidae
Tolerance: Sensitive
Trophic: Herbivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
2

FIBI Calculation Factors

Factor Value
Drainage area (mi2) 4.6850
Log(DA) 0.6707
Total Fish 188
Fish per 500 ft 153
Total Species 6
# Excluded Taxa 0
# Exotic Species 0
# LMB-BG 0
Calculation Last Updated 2/7/2025 2:32:31 PM

Fish Index of Biotic Integrity

Metric Name Value Score
Native Species 6 7.59
Sucker Species 1 7.45
Sensitive Species 1 10
Benthic Invertivore Species 0 0
Top 3 Abundance Percentage 94.68 2.03
Benthic Invertivore Percentage 0 0
Omnivore Percentage 31.91 9.53
Top Carnivore Percentage 0 0
Lithophilous Spawner Percentage 0 0
Tolerance Index 8.67 2.11
Adjusted Catch per Unit Effort 7.82 0.78
DELT Percentage Adjustment 0 0

FIBI Score Explained

Sites that score between 26 - 50 are considered fair. Fish abundance ranges from lower than average to very abundant. If fish are abundant, tolerant species are usually dominant. Native fish species usually equal ten or more species. The three most abundant species typically comprise two-thirds or more of the total number of fish. One or more sensitive species, long-lived fish species or benthic habitat specialists such as suckers (Catostomidae) are present. Top carnivore species are often, but not always present in low abundance. Species that are able to utilize a wide range of food items including plant, animal and detritus are usually more common than specialized feeders, such as benthic invertivore fish. Species that require silt-free, rock substrate for spawning or feeding are typically rare or absent. Fish condition is usually good; however, elevated levels of fish exhibiting external anomalies associated with disease or stress are not unusual.

This location has been classified as a Candidate Reference Site. Further study is required to determine if this site represents natural stream qualities that are least disturbed by human activities within the watershed.

EcoRegion Comparison

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

Northwest Iowa Loess Prairies

This site is in the Northwest Iowa Loess Prairies ecoregion.

Ecoregion Map
Max 63
75th Percentile 49
Median 44
25th Percentile 40
Min 35
This Session's Score 36
Total Reference Site Samples 25
Mean 45.36
Standard Deviation 7.15