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

Unnamed Tributary to Volga River E of Fayette (Volga_Grannis_58)

Fish Session #922

Sample Date
8/21/2024
Timeframe
32 minutes of effort
Reach Size
360 ft
Method
Standard Wadeable
Sample Quality
Good
Last Update
10/9/2024 1:05:01 PM

Fish Health

# DELTs
0
# Non-DELTs
0

Equipment

Backpack Shockers
1
Blocknets
0
This sampling session was collected as part of the FishNet program.
Notice: This sampling session has not been through a Quality Assurance check and may contain errors. This notice will be removed once the QA has been completed.
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

water temperature 55 degrees conductivity was 650 µs/cm backpack shocker settings 60/20 130V 2.1A just downstream of first EF run was a hole that contained one brown trout ( 360mm in length) was sampled.

Collected Fish

Identity verification status for this species
Morphometrics: Length/Weight measurements of individual specimens
Taxa excluded from species count metrics.
Click on species name for more information about that species
Species Catch
Brook Stickleback
Latin: Culaea inconstans
Family: Gasterosteidae
Tolerance: Sensitive
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
62
Creek Chub
Latin: Semotilus atromaculatus
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Generalist
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
48
Stoneroller spp.
Latin: Campostoma spp.
Family: Leuciscidae
Tolerance: N/A
Trophic: Herbivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
1
Fathead Minnow
Latin: Pimephales promelas
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
1

FIBI Calculation Factors

Factor Value
Drainage area (mi2) 1.6400
Log(DA) 0.2148
Total Fish 112
Fish per 500 ft 156
Total Species 4
# Excluded Species 0
# Exotic Species 0
# LMB-BG 0
Calculation Last Updated 10/9/2024 1:05:01 PM

Fish Index of Biotic Integrity

Metric Name Value Score
Native Species 4 10
Sucker Species 0 0
Sensitive Species 1 8.15
Benthic Invertivore Species 0 0
Top 3 Abundance Percentage 99.11 1.06
Benthic Invertivore Percentage 0 0
Omnivore Percentage 0.89 10
Top Carnivore Percentage 0 0
Lithophilous Spawner Percentage 0 0
Tolerance Index 4.41 8.87
Adjusted Catch per Unit Effort 17.22 1.72
DELT Percentage Adjustment 0 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 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:

Paleozoic Plateau (Driftless Area)

This site is in the Paleozoic Plateau (Driftless Area) ecoregion.

Ecoregion Map
Max 91
75th Percentile 63
Median 54
25th Percentile 47
Min 9
This Session's Score 36
Total Reference Site Samples 114
Mean 55.61
Standard Deviation 16.18