Bigmouth Buffalo
Bigmouth Buffalo (Ictiobus cyprinellus) is a freshwater species. The first thing to check: no barbels at all — the first check, and what separates it from every carp. The look-alike to rule out is Common Carp: carp have two pairs of barbels and a serrated leading dorsal spine; buffalo have neither.
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| Scientific name | Ictiobus cyprinellus |
|---|---|
| Also called | gourdhead, redmouth buffalo |
| Water | Freshwater |
| Group | Sucker |
| Temperature | Most active between 65 and 80 °F. |
How to identify a Bigmouth Buffalo
- No barbels at all — the first check, and what separates it from every carp.
- A large, oblique mouth angled upward at the front of the head, for feeding in the water column.
- A long dorsal fin with a raised, rounded front lobe and no serrated spine.
If you would rather not work through a key on a wet deck, photograph the fish and let the app name it — you get the common and the scientific name back, and the record is filed before you release.
Fish it is mistaken for
| Species | How to tell them apart |
|---|---|
| Common Carp | Carp have two pairs of barbels and a serrated leading dorsal spine; buffalo have neither. |
| Smallmouth Buffalo | The smallmouth buffalo's mouth is small and points downward for bottom feeding, not upward. |
Read the full entry for Common Carp.
Where it lives
Large rivers, oxbows, backwaters and reservoirs of the Mississippi basin and north into Canada. Holds in open water and slow current rather than tight to structure.
Temperature
Most active between 65 and 80 °F.
The conditions that matter
Bigmouth buffalo filter plankton from the water column rather than grubbing the bottom, which is why they are so rarely caught on conventional bait and why they concentrate where plankton does. They tolerate turbid, warm, low-oxygen water that pushes other large fish out.
Global Fishing League records 18 weather and water readings against every catch automatically — tide stage, barometric pressure, water temperature, salinity, dissolved oxygen, chlorophyll, swell, current, moon phase and more, taken at your GPS position at the moment you log the fish. Over a season that turns a hunch about bigmouth buffalo into a pattern you can read.
See every reading recorded with a catch, or the guides to what each reading means.
Size limits, bag limits and seasons
Size limits, bag limits, slot limits and seasons are set by your state wildlife agency — and for many offshore and migratory species by federal regulators — and on many waters they differ from the statewide rule. They also change between seasons. Check the current regulations for the exact water you are fishing before you keep a fish — we do not republish limits here, because a number that is a season out of date is worse than no number.
What the app does do is make your side of it accurate: every catch carries a length measured from the photograph, a GPS position and a timestamp, exportable if you ever need to show your work for a tournament or a record claim. It is also what a Global Fishing League entry is built from — a record that verifies itself, without publishing where you caught the fish.