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

Baldwin Mason Creek Mechanicsville (HW36)

Fish Session #1356

Sample Date
6/23/2011
Timeframe
0945-1030  
Reach Size
612 ft
Method
Standard Wadeable
Sample Quality
Good
Last Update
4/9/2012 10:53:01 AM

Fish Health

# DELTs
1
# Non-DELTs
0

Equipment

Backpack Shockers
2
Blocknets
1
Property Access Notice

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

FIBI Score
53
Warm Water
Good
Session Comments

Flow slightly elevated above baseflow from rains earlier in the week

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
Western Blacknose Dace
Latin: Rhinichthys obtusus
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
40
Green Sunfish
Latin: Lepomis cyanellus
Family: Centrarchidae
Tolerance: Tolerant
Trophic: Generalist
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
34
Creek Chub
Latin: Semotilus atromaculatus
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Generalist
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
15
Mississippi Silvery Minnow
Latin: Hybognathus nuchalis
Family: Leuciscidae
Tolerance: Sensitive
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
13
White Sucker
Latin: Catostomus commersonii
Family: Catostomidae
Tolerance: Intermediate
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
12
Spotfin Shiner
Latin: Cyprinella spiloptera
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
8
Bluntnose Minnow
Latin: Pimephales notatus
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
4
Johnny Darter
Latin: Etheostoma nigrum
Family: Percidae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
4
Bigmouth Shiner
Latin: Ericymba dorsalis
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
2
Carmine Shiner
Latin: Notropis percobromus
Family: Leuciscidae
Tolerance: Sensitive
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
2
Golden Redhorse
Latin: Moxostoma erythrurum
Family: Catostomidae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: True
Is Hybrid: False
2
Shorthead Redhorse
Latin: Moxostoma macrolepidotum
Family: Catostomidae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: True
Is Hybrid: False
2
Redhorse spp.
Latin: Moxostoma spp.
Family: Catostomidae
Tolerance: N/A
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
1 [X]
Mud Darter
Latin: Etheostoma asprigene
Family: Percidae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
1
Collection Notes
[X] = Excluded from species count metrics

FIBI Calculation Factors

Factor Value
Drainage area (mi2) 10.4000
Log(DA) 1.0170
Total Fish 140
Fish per 500 ft 114
Total Species 14
# Excluded Taxa 1
# Exotic Species 0
# LMB-BG 0
Calculation Last Updated 2/7/2025 2:34:29 PM

Fish Index of Biotic Integrity

Metric Name Value Score
Native Species 13 7.67
Sucker Species 3 9.05
Sensitive Species 2 3.44
Benthic Invertivore Species 4 6.56
Top 3 Abundance Percentage 63.57 9.18
Benthic Invertivore Percentage 7.14 2.94
Omnivore Percentage 20.71 9.72
Top Carnivore Percentage 0 0
Lithophilous Spawner Percentage 2.86 2.34
Tolerance Index 6.44 5.65
Adjusted Catch per Unit Effort 13.73 1.37
DELT Percentage Adjustment 0.71 0

FIBI Score Explained

Sites that score between 51 - 70 are considered good. Fish (excluding tolerant species) are fairly abundant to very abundant. If high numbers are present, intermediately tolerant species or tolerant species are usually dominant. A moderately high number of fish species belonging to several families are present. The three most abundant fish species typically comprise two-thirds or less of the total number of fish. Several long-lived species and benthic invertivore species are present. One or more sensitive species are usually present. Top carnivore species are usually present in low numbers and often one or more life stages are missing. Species that require silt-free, rock substrate for spawning or feeding are present in low proportion to the total number of fish. Fish condition is good; typically less than 1% of the total number of fish exhibits external anomalies associated with disease or stress.

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:

Rolling Loess Prairies

This site is in the Rolling Loess Prairies ecoregion.

Ecoregion Map
Max 83
75th Percentile 59
Median 48
25th Percentile 38
Min 10
This Session's Score 53
Total Reference Site Samples 105
Mean 49.02
Standard Deviation 14.97