Bighead Carp
Bighead Carp (Hypophthalmichthys nobilis) is a freshwater species. The first thing to check: a belly keel that runs only from the pelvic fins back to the vent, stopping well short of the throat. The look-alike to rule out is Silver Carp: a silver carp's keel runs the full length of the belly to the throat, and its flanks are plain silver with no blotching.
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| Scientific name | Hypophthalmichthys nobilis |
|---|---|
| Also called | Asian carp, noble fish |
| Water | Freshwater |
| Group | Carp |
| Temperature | Active from the 60s through the 80s °F. |
How to identify a Bighead Carp
- A belly keel that runs only from the pelvic fins back to the vent, stopping well short of the throat.
- Irregular dark grey-brown blotches scattered over a silver flank.
- A very large head with eyes set low, below the level of the mouth, and no barbels.
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 |
|---|---|
| Silver Carp | A silver carp's keel runs the full length of the belly to the throat, and its flanks are plain silver with no blotching. |
| Common Carp | Common carp have barbels, large scales and a serrated dorsal spine, and their eyes sit above the level of the mouth. |
Side-by-side comparisons
Read the full entry for Silver Carp and Common Carp.
Where it lives
Invasive through the Mississippi basin alongside silver carp, holding in slower water, backwaters and reservoir arms.
Temperature
Active from the 60s through the 80s °F.
The conditions that matter
Bighead filter zooplankton rather than the phytoplankton silver carp take, so the two separate out along the same river by what the water is carrying. Like silver carp they usually may not be released alive, and a recorded capture at the edge of the known range is useful data.
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 bighead carp 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.