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

Floyd River Sheldon Well Field

Fish Session #60

Sample Date
9/7/1995
Timeframe
0900-1100  
Reach Size
1110 ft
Method
Standard Wadeable
Sample Quality
Fair
Last Update
2/26/2025 7:30:38 AM

Fish Health

# DELTs
2
# Non-DELTs
0

Equipment

Backpack Shockers
0
Blocknets
2
Barge Shocker
True
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

COOL AND CLOUDY, TEMP. ABOUT 50 F. FLOW MUCH ABOVE NORMAL, FOLLOWING RECENT RAINS. MODERATELY HIGH TURBIDITY OF WATER. MAX. DEPTH IN SAMPLING REACH WAS >4.5'. A FEW AREAS AT CHANNEL BENDS WERE TOO DEEP TO WADE INTO. SAMPLING EFFECTIVENESS WAS GENERALLY FAIR DUE TO SWIFT CURRENT AND LACK OF VISIBILITY. SHOCKER UNIT PERFORMED WELL ON LOW DC SETTING. SPEC. KEPT.

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
Central Stoneroller
Latin: Campostoma anomalum
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Herbivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
418
Creek Chub
Latin: Semotilus atromaculatus
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Generalist
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
394
White Sucker
Latin: Catostomus commersonii
Family: Catostomidae
Tolerance: Intermediate
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
163
Western Blacknose Dace
Latin: Rhinichthys obtusus
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
114
Common Shiner
Latin: Luxilus cornutus
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
100
Bigmouth Shiner
Latin: Ericymba dorsalis
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
92
Sand Shiner
Latin: Miniellus stramineus
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
64
Fathead Minnow
Latin: Pimephales promelas
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
57
Johnny Darter
Latin: Etheostoma nigrum
Family: Percidae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
28
Orangespotted Sunfish
Latin: Lepomis humilis
Family: Centrarchidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
8
Green Sunfish
Latin: Lepomis cyanellus
Family: Centrarchidae
Tolerance: Tolerant
Trophic: Generalist
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
7
Stonecat
Latin: Noturus flavus
Family: Ictaluridae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
5
Brassy Minnow
Latin: Hybognathus hankinsoni
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Herbivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
4
Common Carp
Latin: Cyprinus carpio
Family: Cyprinidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: True
Is LithoSpawner: False
Is Hybrid: False
3
Bluegill
Latin: Lepomis macrochirus
Family: Centrarchidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
3

FIBI Calculation Factors

Factor Value
Drainage area (mi2) 65.2420
Log(DA) 1.8145
Total Fish 1460
Fish per 500 ft 658
Total Species 15
# Excluded Taxa 0
# Exotic Species 1
# LMB-BG 1
Calculation Last Updated 2/26/2025 7:30:39 AM

Fish Index of Biotic Integrity

Metric Name Value Score
Native Species 13 6.08
Sucker Species 1 2.76
Sensitive Species 0 0
Benthic Invertivore Species 2 3.54
Top 3 Abundance Percentage 66.78 5.16
Benthic Invertivore Percentage 2.26 0.52
Omnivore Percentage 15.27 8.55
Top Carnivore Percentage 0 0
Lithophilous Spawner Percentage 0 0
Tolerance Index 6.89 4.94
Adjusted Catch per Unit Effort 81.71 8.17
DELT Percentage Adjustment 0.14 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 Rejected Candidate Reference Site. This site was considered for Reference Site status, but subsequent biological assessments have determined that this site does not meet the qualifications of a Reference Site.

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