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

Saunders Branch Mt Pleasant (SE WWTP DS)

Fish Session #18

Sample Date
10/14/1998
Timeframe
Unspecified  
Reach Size
400 ft
Method
Standard Wadeable
Sample Quality
Good
Last Update
10/1/2004 12:00:00 AM

Fish Health

# DELTs
4
# Non-DELTs
3

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.

FIBI Score
37
Warm Water
Fair
Session Comments

FLOW WAS APPROX. 2.5 CFS. WATER HAD YELLOW/GREEN COLOR BUT WAS NOT TURBID. WATER MADE SOFT VISCOUS SOUND AS IT FLOWED OVER ROCKY STREAM BOTTOM (RT).

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
17
Slender Madtom
Latin: Noturus exilis
Family: Ictaluridae
Tolerance: Sensitive
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
15
Green Sunfish
Latin: Lepomis cyanellus
Family: Centrarchidae
Tolerance: Tolerant
Trophic: Generalist
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
6
Bluegill
Latin: Lepomis macrochirus
Family: Centrarchidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
6
White Sucker
Latin: Catostomus commersonii
Family: Catostomidae
Tolerance: Intermediate
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
4
Central Stoneroller
Latin: Campostoma anomalum
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Herbivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
2
Bluntnose Minnow
Latin: Pimephales notatus
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
2
Hybrid: Green Sunfish X Bluegill
Latin: Lepomis cyanellus X L. macrochirus
Family: Centrarchidae
Tolerance: N/A
Trophic: N/A
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: True
2
Bigmouth Shiner
Latin: Ericymba dorsalis
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
1
Yellow Bullhead
Latin: Ameiurus natalis
Family: Ictaluridae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
1

FIBI Calculation Factors

Factor Value
Drainage area (mi2) 3.2230
Log(DA) 0.5083
Total Fish 56
Fish per 500 ft 70
Total Species 10
# Excluded Taxa 0
# Exotic Species 0
# LMB-BG 1
Calculation Last Updated 2/7/2025 2:32:05 PM

Fish Index of Biotic Integrity

Metric Name Value Score
Native Species 8 9.44
Sucker Species 1 6.03
Sensitive Species 1 3.45
Benthic Invertivore Species 2 6.56
Top 3 Abundance Percentage 67.86 5
Benthic Invertivore Percentage 29.63 5
Omnivore Percentage 11.11 5
Top Carnivore Percentage 0 0
Lithophilous Spawner Percentage 0 0
Tolerance Index 6.02 5
Adjusted Catch per Unit Effort 7 0.7
DELT Percentage Adjustment 7.14 -5

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 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:

Loess Flats and Till Plains

This site is in the Loess Flats and Till Plains ecoregion.

Ecoregion Map
Max 63
75th Percentile 47
Median 41
25th Percentile 35
Min 16
This Session's Score 37
Total Reference Site Samples 49
Mean 40.8
Standard Deviation 12.08