Bigmouth buffalo
A long-lived North American freshwater fish known for its terminal mouth and exceptional lifespan.
The bigmouth buffalo is the largest species in the sucker family, native to river systems across Canada and the United States. Recent studies reveal it can live over a century, making it the oldest validated freshwater fish, though populations are declining due to unregulated fishing and habitat changes.
- Lives up to 148 years, the longest recorded for any freshwater teleost.
- Uses a forward-facing mouth to filter plankton from the water column.
- Populations in Minnesota are over 85% older than eighty years.
- Can tolerate water turbidity levels exceeding 100 parts per million.
- Releases adhesive eggs into vegetation during spring floods.
What it is
This large freshwater fish belongs to the sucker family rather than carp, despite similar appearances. It features a brownish olive body with dusky fins that can vary to golden or melanistic hues. A key identifier is its forward-facing terminal mouth, which supports its unique feeding style. Adults grow significantly, reaching lengths over one metre and weights near thirty-six kilograms. Unlike many relatives, it possesses a long dorsal fin and distinct pigmentation patterns that develop with age.
Where it lives
Native to North America, this species inhabits major drainage basins including the Mississippi, Hudson Bay, and Missouri Rivers. Its range extends from Manitoba and Alberta in Canada down to Texas and Alabama in the United States. Specific populations exist in the Red River of the North, Qu'Appelle River, and Milk River. Reintroductions have occurred in reservoirs along the Missouri River and in California aqueducts, though these are not part of its original native distribution.
How it lives
As an adult, the bigmouth buffalo acts as a filter feeder, straining plankton and small invertebrates from the water using fine gill rakers. It thrives in turbid, low-oxygen environments with slow-moving water. While juveniles feed near the bottom, adults often hunt in open water columns. They face predation from walleye, pike, and gar during early life stages. The species exhibits a slow life pace, surviving decades without successful reproduction events, relying on rare favorable conditions for population growth.
Breeding and life cycle
Spawning occurs in spring when water temperatures rise between thirteen and twenty-six degrees Celsius. Females release hundreds of thousands of tiny adhesive eggs into vegetated waters, requiring rising water levels to trigger the event. If water levels do not increase sufficiently, females may skip spawning entirely. Larvae hatch quickly but face high mortality from predators like bluegill and northern pike. Successful recruitment depends heavily on specific water-level recession rates and drought conditions.
Fish and people
Historically valued by Native Americans and later by commercial fisheries since the nineteenth century, the meat is considered flavorful despite small bones. Today, it serves as both a food source and a sport fish. Commercial harvesters use nets in designated areas, while recreational anglers pursue it via rod-and-line or lethal bowfishing. Unregulated night bowfishing has surged recently, contributing to population declines. In some regions, strict protections limit harvest, whereas others allow unlimited take.
Status and threats
Populations are declining across much of their northern range due to habitat loss, dams, and unmanaged fishing pressures. In Canada, the species is listed as special concern under the Species at Risk Act. Pennsylvania classifies it as endangered. Studies show many populations consist almost entirely of individuals born before the 1970s, indicating a failure of young fish to survive. Conservationists argue that current management practices, particularly regarding bowfishing, are incompatible with the species' slow reproductive biology.
Questions people ask about Bigmouth buffalo
How old can a bigmouth buffalo get?
They can live up to 148 years, making them the oldest validated freshwater fish species. This longevity was confirmed through radiocarbon dating of their ear bones, shattering previous estimates of around twenty-six years.
What does a bigmouth buffalo eat?
Adults are filter feeders that strain plankton, copepods, and algae from the water. They also consume insect larvae and can filter invasive zebra mussels during their larval stage, helping control those populations.
Why are bigmouth buffalo populations declining?
Declines stem from habitat degradation, dams blocking movement, and unregulated lethal fishing like modern bowfishing. Their slow reproduction means they cannot replace lost adults quickly, leading to aging populations with few young survivors.
Is the bigmouth buffalo a type of carp?
No. Although they look similar and share an order, they belong to different suborders. Bigmouth buffalo are suckers in the family Catostomidae, while carps are in Cyprinidae, originating from separate continents.
Good reading and sources
- Bigmouth buffalo: The mysterious fish that live for a century and don't decline with ageBBC, Article
- Bigmouth buffalo on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Bigmouth buffalo", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFish rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
