Meet the 7 Oldest Animals That Call the Mississippi River Their Home

The Mississippi River is a unique river in North America. It’s about 2,350 miles long and is the 4th longest river in the entire world. First place goes to the Nile River which is 4,160 miles long. While long, the Mississippi River is about 11 miles wide at the widest point. However, in some parts is as slender as 20 to 30 feet.

The Mississippi River is also old. Scientists estimate that the river is between 5.6 and 40 million years old, but its history spans 70 million years. With such an old age, you can imagine just how many creatures once called this river home. While many of the species are extinct, but still found as fossils, some animals have been around for millions of years. Keep reading to meet some of the oldest animals that call the Mississippi River their home.

Paddlefish

American paddlefish are native to the Mississippi River. It’s also called the Mississippi paddlefish. It’s a species of ray-finned fish. They are closely related to sturgeons. Paddlefish have been around for a long time. The oldest fossil recorded dates back 125 million years to the Early Cretaceous. While still commonly found in the river, they once moved more freely in unaltered conditions.

American paddlefish are not threatened but considered vulnerable. They are about 4.9 feet long and weigh 60 pounds. These unique fish have shark-like bodies. Typically, paddlefish live up to 60 years in the wild, and sometimes longer. These large fish are commonly found in deeper, low-current areas. Sadly, because of overfishing and habitat destruction, populations are declining. The infestation of zebra mussels in the Mississippi River also negatively affects these large shark-like fish.

Alligators

Alligators are walking fossils. While alligators are not common in the state of Mississippi, you can still find them throughout the river in brackish water near swamps. However, Louisiana has at least 2 million alligators in Louisiana. Alligators have been around for millions of years. Their first early ancestor emerged 245 million years ago.

Alligators are large apex predators. American alligators are mainly found spread throughout southern states in swampy and marshland areas. They are massive, easily reaching past 14 feet long. In fact, the largest alligator caught in the world was 15 feet and 9 inches, but there are some reports of an alligator over 19 feet long in Louisiana.

Gulf Sturgeon

Sturgeon are old fish. The oldest fossil ever found is from 100.5 million years ago to 66 million years ago during the Late Cretaceous. Gulf sturgeon is a subspecies of sturgeon living in the Gulf of Mexico and some rivers that drain into the gulf. They are considered threatened and historically, scientists believe they lived from the Suwannee River on the western coast of Florida and to the Mississippi River. These fish are long and look like sharks. These unique fish also vary in size and weight depending on their diet. The gulf sturgeon mainly or only eat during the winter, fasting during warm months. 

Catfish

Catfish are some of the oldest fish in the world. The first catfish fossil found so far dates back about 70 million years ago. Catfish are important to their environments and are a great source of protein and nutrients for us too. Catfish doesn’t refer to a specific species, but instead a group of unique ray-finned fish known for their whisker-like prominent barbels. Some catfish species grow very big, including the Mekong giant catfish. Some catfish species though have become invasive species, specifically throughout Europe.

Bass

There is no shortage of bass fish in the Mississippi River. There is a favorite for anglers, attracting them from all over the world. Some common bass found in the Mississippi River includes largemouth bass, smallmouth bass, and striped bass. These large fish live about 5-6 years. However, bass fish native to colder waters live closer to 20 years. In Texas, the oldest bass fossil ever was uncovered and estimates that bass existed about 26 million years ago. The largest bass ever caught in the state of Mississippi weighed 18 pounds and 15 ounces. Anthony Denny caught this monster fish in Natchez State Park on December 31, 1992. What a great way to end the year!

Bull Sharks

Did you know bull sharks live in the Mississippi River? Bull sharks are one of the only sharks that can live in freshwater and saltwater conditions. Sometimes, they make their way into the Mississippi River from the Gulf of Mexico. Although not as common as you would think, it’s definitely something worth seeing. Bull sharks swim in shallow warm waters and weigh up to 290 pounds. Although they aren’t the largest shark species, they are aggressive and fierce. Sharks have a long history, including the bull shark. There is still a lot that experts don’t know about these fascinating sharks. However, they are thought to be hundreds of millions of years old.

Bowfin

Bowfish are old, often called “primitive fish,” because they have some of the same characteristics as their early ancestors. They are also the only surviving species in the Amiidae family. This family first emerged in the Jurassic Period about 201.3 million to 145 years ago.

The bowfin is native to the eastern United States and southeast Canada but is found all across North America. These highly aggressive ambush predators aren’t picky eaters and consume insects, fish, and crustaceans. Although bowfin fish live throughout the Mississippi River, their population has decreased.

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