FishesIn Athens County, Ohio
Western Mosquitofish
Gambusia affinis (Baird & Girard, 1853)
Western Mosquitofish in all of Ohio- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Teleostei
- Order
- Cyprinodontiformes
- Family
- Poeciliidae
- Genus
- Gambusia
Introduced and invasive status
Introduced in Ohio: iNaturalist (opens in a new tab)
iNaturalist's volunteer curators list it as introduced in their Ohio checklist.
Near Athens County
Range
Where it is recorded
Season shown in 0 of Ohio's 88 counties. Explore Ohio
- No result yet (43)
- Recorded, too few records for a result (42)
- Recorded, season not shown (3)
- Season shown (0)
Counties as a table
| County | Records |
|---|---|
| Adams County | No qualifying records yet |
| Allen County | Recorded, too few records for a result |
| Ashland County | No qualifying records yet |
| Ashtabula County | No qualifying records yet |
| Athens County | 75 · Recorded, season not shown |
| Auglaize County | No qualifying records yet |
| Belmont County | Recorded, too few records for a result |
| Brown County | No qualifying records yet |
| Butler County | Recorded, too few records for a result |
| Carroll County | No qualifying records yet |
| Champaign County | Recorded, too few records for a result |
| Clark County | Recorded, too few records for a result |
| Clermont County | Recorded, too few records for a result |
| Clinton County | No qualifying records yet |
| Columbiana County | No qualifying records yet |
| Coshocton County | Recorded, too few records for a result |
| Crawford County | No qualifying records yet |
| Cuyahoga County | Recorded, too few records for a result |
| Darke County | Recorded, too few records for a result |
| Defiance County | No qualifying records yet |
| Delaware County | Recorded, too few records for a result |
| Erie County | No qualifying records yet |
| Fairfield County | Recorded, too few records for a result |
| Fayette County | No qualifying records yet |
| Franklin County | 52 · Recorded, season not shown |
| Fulton County | No qualifying records yet |
| Gallia County | Recorded, too few records for a result |
| Geauga County | Recorded, too few records for a result |
| Greene County | Recorded, too few records for a result |
| Guernsey County | No qualifying records yet |
| Hamilton County | 27 · Recorded, season not shown |
| Hancock County | No qualifying records yet |
| Hardin County | Recorded, too few records for a result |
| Harrison County | Recorded, too few records for a result |
| Henry County | No qualifying records yet |
| Highland County | No qualifying records yet |
| Hocking County | No qualifying records yet |
| Holmes County | Recorded, too few records for a result |
| Huron County | No qualifying records yet |
| Jackson County | Recorded, too few records for a result |
| Jefferson County | No qualifying records yet |
| Knox County | Recorded, too few records for a result |
| Lake County | Recorded, too few records for a result |
| Lawrence County | No qualifying records yet |
| Licking County | Recorded, too few records for a result |
| Logan County | Recorded, too few records for a result |
| Lorain County | Recorded, too few records for a result |
| Lucas County | Recorded, too few records for a result |
| Madison County | Recorded, too few records for a result |
| Mahoning County | No qualifying records yet |
| Marion County | No qualifying records yet |
| Medina County | Recorded, too few records for a result |
| Meigs County | No qualifying records yet |
| Mercer County | Recorded, too few records for a result |
| Miami County | No qualifying records yet |
| Monroe County | Recorded, too few records for a result |
| Montgomery County | Recorded, too few records for a result |
| Morgan County | No qualifying records yet |
| Morrow County | Recorded, too few records for a result |
| Muskingum County | Recorded, too few records for a result |
| Noble County | No qualifying records yet |
| Ottawa County | Recorded, too few records for a result |
| Paulding County | No qualifying records yet |
| Perry County | No qualifying records yet |
| Pickaway County | Recorded, too few records for a result |
| Pike County | No qualifying records yet |
| Portage County | Recorded, too few records for a result |
| Preble County | Recorded, too few records for a result |
| Putnam County | No qualifying records yet |
| Richland County | No qualifying records yet |
| Ross County | Recorded, too few records for a result |
| Sandusky County | Recorded, too few records for a result |
| Scioto County | No qualifying records yet |
| Seneca County | No qualifying records yet |
| Shelby County | Recorded, too few records for a result |
| Stark County | Recorded, too few records for a result |
| Summit County | Recorded, too few records for a result |
| Trumbull County | No qualifying records yet |
| Tuscarawas County | No qualifying records yet |
| Union County | No qualifying records yet |
| Van Wert County | No qualifying records yet |
| Vinton County | No qualifying records yet |
| Warren County | Recorded, too few records for a result |
| Washington County | No qualifying records yet |
| Wayne County | No qualifying records yet |
| Williams County | No qualifying records yet |
| Wood County | Recorded, too few records for a result |
| Wyandot County | No qualifying records yet |
No mapped range from the range source used, the USGS Gap Analysis Project, which maps land vertebrates only.
Season
When it is recorded
In Athens County
Not enough evidence
Recorded in two separate seasons, so one season would put its middle week in the gap. Based on 75 records in 6 of the 10 years from 2016 to 2025, above the minimum of 20 records from 5 different years.
Show over the bars
Records per week from 75 records in 6 of the 10 years from 2016 to 2025. Shows when people recorded it, not a season or how common it is.
Show as a table
| Week | Records of Western Mosquitofish | Years recorded | Records of all species |
|---|---|---|---|
| Jan 4–10 | 0 | 0 | 74 |
| Jan 11–17 | 0 | 0 | 132 |
| Jan 18–24 | 0 | 0 | 107 |
| Jan 25–31 | 0 | 0 | 219 |
| Feb 1–7 | 0 | 0 | 392 |
| Feb 8–14 | 0 | 0 | 232 |
| Feb 15–21 | 0 | 0 | 235 |
| Feb 22–28 | 0 | 0 | 361 |
| Mar 1–7 | 0 | 0 | 532 |
| Mar 8–14 | 0 | 0 | 466 |
| Mar 15–21 | 0 | 0 | 593 |
| Mar 22–28 | 0 | 0 | 950 |
| Mar 29 – Apr 4 | 7 | 3 | 1,265 |
| Apr 5–11 | 0 | 0 | 1,616 |
| Apr 12–18 | 1 | 1 | 1,804 |
| Apr 19–25 | 2 | 1 | 1,926 |
| Apr 26 – May 2 | 1 | 1 | 2,291 |
| May 3–9 | 7 | 1 | 1,407 |
| May 10–16 | 22 | 3 | 1,408 |
| May 17–23 | 9 | 3 | 2,542 |
| May 24–30 | 0 | 0 | 1,821 |
| May 31 – Jun 6 | 0 | 0 | 798 |
| Jun 7–13 | 0 | 0 | 775 |
| Jun 14–20 | 0 | 0 | 830 |
| Jun 21–27 | 0 | 0 | 700 |
| Jun 28 – Jul 4 | 0 | 0 | 549 |
| Jul 5–11 | 0 | 0 | 664 |
| Jul 12–18 | 1 | 1 | 869 |
| Jul 19–25 | 0 | 0 | 700 |
| Jul 26 – Aug 1 | 0 | 0 | 673 |
| Aug 2–8 | 0 | 0 | 613 |
| Aug 9–15 | 0 | 0 | 871 |
| Aug 16–22 | 0 | 0 | 807 |
| Aug 23–29 | 1 | 1 | 1,289 |
| Aug 30 – Sep 5 | 0 | 0 | 2,925 |
| Sep 6–12 | 0 | 0 | 2,530 |
| Sep 13–19 | 0 | 0 | 2,417 |
| Sep 20–26 | 3 | 1 | 1,530 |
| Sep 27 – Oct 3 | 0 | 0 | 1,628 |
| Oct 4–10 | 18 | 1 | 1,836 |
| Oct 11–17 | 0 | 0 | 1,920 |
| Oct 18–24 | 0 | 0 | 825 |
| Oct 25–31 | 2 | 1 | 930 |
| Nov 1–7 | 0 | 0 | 881 |
| Nov 8–14 | 1 | 1 | 846 |
| Nov 15–21 | 0 | 0 | 573 |
| Nov 22–28 | 0 | 0 | 536 |
| Nov 29 – Dec 5 | 0 | 0 | 270 |
| Dec 6–12 | 0 | 0 | 982 |
| Dec 13–19 | 0 | 0 | 158 |
| Dec 20–26 | 0 | 0 | 106 |
| Dec 27 – Jan 2 | 0 | 0 | 95 |
In Ohio
Late March to late June, middle week mid-May
Recorded in two separate seasons, each shown with its own early, middle and late weeks. A later season is not shown: most records are from one year.
This week · Nov 8–14
Show over the bars
Records per week from 430 records in 9 of the 10 years from 2016 to 2025. Shows when people recorded it, not a season or how common it is.
Show as a table
| Week | Records of Western Mosquitofish | Years recorded | Records of all species |
|---|---|---|---|
| Jan 4–10 | 1 | 1 | 6,211 |
| Jan 11–17 | 0 | 0 | 5,146 |
| Jan 18–24 | 0 | 0 | 4,645 |
| Jan 25–31 | 0 | 0 | 4,698 |
| Feb 1–7 | 0 | 0 | 6,023 |
| Feb 8–14 | 0 | 0 | 5,888 |
| Feb 15–21 | 0 | 0 | 5,436 |
| Feb 22–28 | 2 | 2 | 6,846 |
| Mar 1–7 | 2 | 1 | 8,321 |
| Mar 8–14 | 2 | 2 | 10,384 |
| Mar 15–21 | 1 | 1 | 12,620 |
| Mar 22–28 | 1 | 1 | 13,949 |
| Mar 29 – Apr 4 | 11 | 4 | 19,661 |
| Apr 5–11 | 0 | 0 | 26,860 |
| Apr 12–18 | 6 | 3 | 39,925 |
| Apr 19–25 | 8 | 2 | 41,623 |
| Apr 26 – May 2 | 17 | 4 | 56,391 |
| May 3–9 | 12 | 2 | 52,952 |
| May 10–16 | 31 | 3 | 53,785 |
| May 17–23 | 23 | 4 | 57,698 |
| May 24–30 | 14 | 5 | 54,651 |
| May 31 – Jun 6 | 11 | 4 | 53,099 |
| Jun 7–13 | 10 | 3 | 53,700 |
| Jun 14–20 | 15 | 5 | 56,625 |
| Jun 21–27 | 12 | 5 | 55,361 |
| Jun 28 – Jul 4 | 7 | 3 | 58,477 |
| Jul 5–11 | 9 | 3 | 61,336 |
| Jul 12–18 | 8 | 3 | 64,722 |
| Jul 19–25 | 11 | 3 | 69,753 |
| Jul 26 – Aug 1 | 21 | 6 | 59,416 |
| Aug 2–8 | 14 | 5 | 59,712 |
| Aug 9–15 | 10 | 3 | 55,994 |
| Aug 16–22 | 12 | 4 | 54,328 |
| Aug 23–29 | 7 | 4 | 51,772 |
| Aug 30 – Sep 5 | 8 | 2 | 57,167 |
| Sep 6–12 | 16 | 4 | 59,075 |
| Sep 13–19 | 19 | 5 | 54,543 |
| Sep 20–26 | 19 | 4 | 45,860 |
| Sep 27 – Oct 3 | 5 | 3 | 43,180 |
| Oct 4–10 | 31 | 6 | 37,841 |
| Oct 11–17 | 10 | 4 | 30,824 |
| Oct 18–24 | 7 | 2 | 21,156 |
| Oct 25–31 | 10 | 3 | 19,021 |
| Nov 1–7 | 4 | 2 | 14,172 |
| Nov 8–14 | 5 | 4 | 12,621 |
| Nov 15–21 | 1 | 1 | 7,965 |
| Nov 22–28 | 2 | 2 | 8,136 |
| Nov 29 – Dec 5 | 5 | 2 | 6,083 |
| Dec 6–12 | 1 | 1 | 6,004 |
| Dec 13–19 | 3 | 1 | 5,423 |
| Dec 20–26 | 0 | 0 | 5,661 |
| Dec 27 – Jan 2 | 6 | 2 | 8,459 |
What these results show
These results show when people recorded a species, not when or where it occurs. Missing weeks and low counts do not mean absence or scarcity, and counts are not abundance. Contributed records reflect where, when and what people chose to observe.
Identification
How to identify it
Look-alikes
Land cover
Often confused with
- Blackstripe Topminnow Fundulus notatus84 identifications worldwide named one where the other was meant
- Fathead Minnow Pimephales promelas19 identifications worldwide named one where the other was meant
- Largemouth Bass Micropterus nigricans16 identifications worldwide named one where the other was meant
- Bluegill Lepomis macrochirus15 identifications worldwide named one where the other was meant
- Bluntnose Minnow Pimephales notatus12 identifications worldwide named one where the other was meant
From iNaturalist’s similar-species counts, refreshed monthly: confusions in Ohio first, then worldwide. Only species with an Ohio result are listed.
Land cover where it is recorded
| Land cover | Its recordsAll Ohio records |
|---|---|
| Developed | 60%49% |
| Forest | 18%31% |
| Wetland | 8%5% |
| Open water | 7%3% |
| Farmland | 2%11% |
| Barren | 2%0.6% |
| Grassland and shrub | 2%0.9% |
From 293 records placed within 100 m, beside all Ohio records placed the same way. People record where they go, so this shows where records come from, not where the species lives. Land cover: USGS Annual NLCD, 2025 (opens in a new tab)
Sources
Where these results come from
- Records from iNaturalist research-grade observations and expert-identified GBIF datasets, CC0, CC BY and CC BY-NC. Sources
- Seasons use the published method and its evidence thresholds. Methods
- See it on iNaturalist (opens in a new tab)OpenPhenology is independent and not affiliated with iNaturalist.
Records behind the Ohio result
430 records from 2 datasets.
- iNaturalist Research-grade Observations (opens in a new tab) · iNaturalist.org · 411 recordsiNaturalist contributors, iNaturalist (2026). iNaturalist Research-grade Observations. iNaturalist.org. Occurrence dataset https://doi.org/10.15468/ab3s5x accessed via GBIF.org on 2026-11-13.
- iNaturalist observations (opens in a new tab) · iNaturalist.org · 19 recordsiNaturalist. Available from https://www.inaturalist.org. Accessed 2026-11-13
To cite: the GBIF download doi:10.15468/dl.y2jkt8 (opens in a new tab).
A spreadsheet (CSV) with a link to each record, on iNaturalist or GBIF. Records whose location was hidden by the observer or the source are counted but not linked.