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

Pike Run Nichols

Fish Session #1433

Sample Date
8/20/2012
Timeframe
0900-1015  
Reach Size
513 ft
Method
Standard Wadeable
Sample Quality
Good
Last Update
11/22/2013 8:41:53 AM

Fish Health

# DELTs
1
# Non-DELTs
0

Equipment

Backpack Shockers
0
Blocknets
1
Barge Shocker
True
Property Access Notice

This site is on public land, such as a county park, state park, or state-managed wildlife area.

FIBI Score
31
Warm Water
Fair
Session Comments

Good effectiveness in open water, but about 1/3 of the reach was completely covered in duckweed.

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
Blackstripe Topminnow
Latin: Fundulus notatus
Family: Fundulidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
133
Bluegill
Latin: Lepomis macrochirus
Family: Centrarchidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
76
Golden Shiner
Latin: Notemigonus crysoleucas
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
54
Largemouth Bass
Latin: Micropterus nigricans
Family: Centrarchidae
Tolerance: Intermediate
Trophic: Top Carnivore-LMB Exclusion
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
27
Common Carp
Latin: Cyprinus carpio
Family: Cyprinidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: True
Is LithoSpawner: False
Is Hybrid: False
13
Bluntnose Minnow
Latin: Pimephales notatus
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
12
Green Sunfish
Latin: Lepomis cyanellus
Family: Centrarchidae
Tolerance: Tolerant
Trophic: Generalist
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
5
Spotfin Shiner
Latin: Cyprinella spiloptera
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
2
Emerald Bowfin
Latin: Amia ocellicauda
Family: Amiidae
Tolerance: Intermediate
Trophic: Top Carnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
2
Western Mosquitofish
Latin: Gambusia affinis
Family: Poecilliidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
1

FIBI Calculation Factors

Factor Value
Drainage area (mi2) 11.4000
Log(DA) 1.0569
Total Fish 325
Fish per 500 ft 317
Total Species 10
# Excluded Taxa 0
# Exotic Species 1
# LMB-BG 2
Calculation Last Updated 2/7/2025 2:32:14 PM

Fish Index of Biotic Integrity

Metric Name Value Score
Native Species 7 3.97
Sucker Species 0 0
Sensitive Species 0 0
Benthic Invertivore Species 0 0
Top 3 Abundance Percentage 80.92 4.63
Benthic Invertivore Percentage 0 0
Omnivore Percentage 24.31 8.95
Top Carnivore Percentage 0.62 5.54
Lithophilous Spawner Percentage 0 0
Tolerance Index 6.29 5.89
Adjusted Catch per Unit Effort 46.98 4.7
DELT Percentage Adjustment 0.31 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 Reference Site. Reference sites represent natural stream qualities that are least disturbed by human activities within the watershed. These sites are then grouped by ecoregion to establish a benchmark against which other streams in the same ecoregion are compared.

EcoRegion Comparison

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

Upper Mississippi Alluvial Plain

This site is in the Upper Mississippi Alluvial Plain ecoregion.

Ecoregion Map
Max 54
75th Percentile 45
Median 38
25th Percentile 31
Min 11
This Session's Score 31
Total Reference Site Samples 13
Mean 36.08
Standard Deviation 13.66