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

Boyer River Early (REMAP #83)

Fish Session #544

Sample Date
8/19/2003
Timeframe
12:00-13:00  
Reach Size
1221 ft
Method
Standard Wadeable
Sample Quality
Fair
Last Update
10/1/2004 12:00:00 AM

Fish Health

# DELTs
3
# Non-DELTs
0

Equipment

Backpack Shockers
2
Blocknets
2
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
39
Warm Water
Fair
Session Comments

No comments recorded.

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
Sand Shiner
Latin: Miniellus stramineus
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
47
Creek Chub
Latin: Semotilus atromaculatus
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Generalist
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
39
Red Shiner
Latin: Cyprinella lutrensis
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
17
White Sucker
Latin: Catostomus commersonii
Family: Catostomidae
Tolerance: Intermediate
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
14
Shorthead Redhorse
Latin: Moxostoma macrolepidotum
Family: Catostomidae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: True
Is Hybrid: False
13
Bigmouth Shiner
Latin: Ericymba dorsalis
Family: Leuciscidae
Tolerance: Tolerant
Trophic: Insectivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
8
Johnny Darter
Latin: Etheostoma nigrum
Family: Percidae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
8
Suckermouth Minnow
Latin: Phenacobius mirabilis
Family: Leuciscidae
Tolerance: Intermediate
Trophic: Benthic Invertivore
Is Exotic: False
Is LithoSpawner: True
Is Hybrid: False
5
Channel Catfish
Latin: Ictalurus punctatus
Family: Ictaluridae
Tolerance: Intermediate
Trophic: Top Carnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
3
Green Sunfish
Latin: Lepomis cyanellus
Family: Centrarchidae
Tolerance: Tolerant
Trophic: Generalist
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
3
Shortnose Gar
Latin: Lepisosteus platostomus
Family: Lepisosteidae
Tolerance: Intermediate
Trophic: Top Carnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
1
Gizzard Shad
Latin: Dorosoma cepedianum
Family: Dorosomatidae
Tolerance: Tolerant
Trophic: Omnivore
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
1
Largemouth Bass
Latin: Micropterus nigricans
Family: Centrarchidae
Tolerance: Intermediate
Trophic: Top Carnivore-LMB Exclusion
Is Exotic: False
Is LithoSpawner: False
Is Hybrid: False
1

FIBI Calculation Factors

Factor Value
Drainage area (mi2) 85.7450
Log(DA) 1.9332
Total Fish 160
Fish per 500 ft 66
Total Species 13
# Excluded Taxa 0
# Exotic Species 0
# LMB-BG 1
Calculation Last Updated 2/7/2025 2:34:29 PM

Fish Index of Biotic Integrity

Metric Name Value Score
Native Species 12 5.26
Sucker Species 2 5.17
Sensitive Species 0 0
Benthic Invertivore Species 3 4.99
Top 3 Abundance Percentage 64.38 5
Benthic Invertivore Percentage 16.25 3.53
Omnivore Percentage 20 5
Top Carnivore Percentage 2.5 4.2
Lithophilous Spawner Percentage 11.25 4.85
Tolerance Index 7.12 4.57
Adjusted Catch per Unit Effort 7.53 0.75
DELT Percentage Adjustment 1.88 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:

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 39
Total Reference Site Samples 25
Mean 45.36
Standard Deviation 7.15