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

Unnamed Tributary to Indian Creek Emerson

Fish Session #2510

Sample Date
5/15/2025
Timeframe
1030-1045  
Reach Size
500 ft
Method
Standard Wadeable
Sample Quality
Good
Last Update
10/28/2025 8:24:26 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.

Fish Project Tags
  • UAA Fish Sampling
FIBI Score
3
Warm Water
Poor
Session Comments

Downstream: 41.01204, -95.40794 Upstream: 41.01127, -95.40801

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
Fathead Minnow
Latin: Pimephales promelas
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
61
Creek Chub
Latin: Semotilus atromaculatus
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Generalist
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
2

FIBI Calculation Factors

Factor Value
Drainage area (mi2) 3.6300
Log(DA) 0.5599
Total Fish 63
Fish per 500 ft 63
Total Species 2
# Excluded Taxa 0
# Exotic Species 0
# LMB-BG 0
Calculation Last Updated 10/28/2025 8:24:38 AM

Fish Index of Biotic Integrity

Metric Name Value Score
Native Species 2 3.03
Sucker Species 0 0
Sensitive Species 0 0
Benthic Invertivore Species 0 0
Top 3 Abundance Percentage 100 0
Benthic Invertivore Percentage 0 0
Omnivore Percentage 96.83 0
Top Carnivore Percentage 0 0
Lithophilous Spawner Percentage 0 0
Tolerance Index 10 0
Adjusted Catch per Unit Effort 0 0
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:

Steeply Rolling Loess Prairies

This site is in the Steeply Rolling Loess Prairies ecoregion.

Ecoregion Map
Max 52
75th Percentile 42
Median 36
25th Percentile 27
Min 12
This Session's Score 3
Total Reference Site Samples 24
Mean 34.04
Standard Deviation 10.79