Critter Science
  • Zoology
    • Ecology
      • Animal Conservation
        • CITES: Protecting Wildlife
        • Endangered Animals
        • Ex Situ Explained
        • In Situ Explained
      • Ecosystems
        • The Biomes
      • Evolution. The Facts.
        • Animal Devolution
        • Arachnids – What are They?
        • Evolution of Amphibians
        • Evolution of Birds
        • Fish and Sharks
        • Natural Selection
        • Primate Language: The Debate
        • What is a Marsupial?
      • Predator vs Prey
      • Producers and Consumers
    • Sustainability
      • Climate Change
      • Global Warming
      • Pollution
        • Air Pollution
        • Land Pollution
        • Microplastics Pollution
        • Water Pollution
      • Recycling
      • Renewable Energy
    • Animal Behavioral Patterns
      • Types of Animal Dormancy
    • What are Species?
      • Amphibians vs Reptiles
      • Animal Reproduction
      • Claws, Nails, and Talons
      • Frogs vs Toads
      • Fur and Hair
      • Gecko Feet
      • Invasive Species
      • IUCN Statuses
      • The Enigmatic Purr
      • Venom vs Poison
      • What is a Marsupial?
    • About the Critterman
  • Daily Critter Facts
    • Amphibian Facts
      • Frog Facts
      • Newt Facts
      • Salamander Facts
      • Toad Facts
    • Arthropod Facts
      • Arachnid Facts
      • Insect Facts
    • Bird Facts
      • Flightless Bird Facts
      • Predatory Bird Facts
      • Scavenger Bird Facts
    • Cryptozoology
    • Fish Facts
      • Cephalopod Facts
      • Crustacean Facts
      • Jellyfish Facts
      • Reefs
      • Shark and Ray Facts
      • Shellfish Facts
    • Flying Mammal Facts
    • Gastropod Facts
    • Land Mammal Facts
      • Canine Facts
      • Feline Facts
      • Lagomorph Facts
      • Marsupial Facts
      • Primate Facts
      • Rodent Facts
      • Ungulate Facts
    • Parasite Facts
    • Reptile Facts
      • Crocodilian Facts
      • Lizard Facts
      • Snake Facts
      • Turtle Facts
    • Sea Mammal Facts
      • Dolphin Facts
      • Porpoise Facts
      • Sea Lion Facts
      • Seal Facts
      • Whale Facts
    • Worm Facts
  • For Teachers
    • Animal Quizzes
      • Amphibians Quiz
      • Bird Quiz
      • Cat Quiz
      • Dolphin Quiz
      • Insect Quiz
      • Reptile Quiz
    • Butterfly Life Cycle
      • Butterfly Metamorphosis
      • World’s Largest Butterfly
      • World’s Largest Moth
    • Metamorphosis – A Frog’s Life Cycle
    • The Cellular Structure of an Animal
    • Insect vs Bug
    • Animal Word Search
    • Coloring Pages
  • Study Guides
    • African Animals
    • Antarctica Animals
    • Asian Animals
    • Australian Animals
    • Central American Animals
    • European Animals
    • North American Animals
    • South American Animals
  • Diseases & Parasites
    • Bsal
    • Canine Distemper Virus (CDV)
    • Chronic Wasting Disease (CWD)
    • The Deadly Chytrid Fungus
    • All About Parasites
    • The Rabies Virus
    • White-Nose Syndrome
  • Contact
    • General Contact
    • Guest Article Submission
      • Guest Articles
        • Guest Articles – 2024
    • What Critter is This?
    • Animal Welfare Organizations
    • Privacy Policy
Subscribe
  • Zoology
    • Ecology
      • Animal Conservation
        • CITES: Protecting Wildlife
        • Endangered Animals
        • Ex Situ Explained
        • In Situ Explained
      • Ecosystems
        • The Biomes
      • Evolution. The Facts.
        • Animal Devolution
        • Arachnids – What are They?
        • Evolution of Amphibians
        • Evolution of Birds
        • Fish and Sharks
        • Natural Selection
        • Primate Language: The Debate
        • What is a Marsupial?
      • Predator vs Prey
      • Producers and Consumers
    • Sustainability
      • Climate Change
      • Global Warming
      • Pollution
        • Air Pollution
        • Land Pollution
        • Microplastics Pollution
        • Water Pollution
      • Recycling
      • Renewable Energy
    • Animal Behavioral Patterns
      • Types of Animal Dormancy
    • What are Species?
      • Amphibians vs Reptiles
      • Animal Reproduction
      • Claws, Nails, and Talons
      • Frogs vs Toads
      • Fur and Hair
      • Gecko Feet
      • Invasive Species
      • IUCN Statuses
      • The Enigmatic Purr
      • Venom vs Poison
      • What is a Marsupial?
    • About the Critterman
  • Daily Critter Facts
    • Amphibian Facts
      • Frog Facts
      • Newt Facts
      • Salamander Facts
      • Toad Facts
    • Arthropod Facts
      • Arachnid Facts
      • Insect Facts
    • Bird Facts
      • Flightless Bird Facts
      • Predatory Bird Facts
      • Scavenger Bird Facts
    • Cryptozoology
    • Fish Facts
      • Cephalopod Facts
      • Crustacean Facts
      • Jellyfish Facts
      • Reefs
      • Shark and Ray Facts
      • Shellfish Facts
    • Flying Mammal Facts
    • Gastropod Facts
    • Land Mammal Facts
      • Canine Facts
      • Feline Facts
      • Lagomorph Facts
      • Marsupial Facts
      • Primate Facts
      • Rodent Facts
      • Ungulate Facts
    • Parasite Facts
    • Reptile Facts
      • Crocodilian Facts
      • Lizard Facts
      • Snake Facts
      • Turtle Facts
    • Sea Mammal Facts
      • Dolphin Facts
      • Porpoise Facts
      • Sea Lion Facts
      • Seal Facts
      • Whale Facts
    • Worm Facts
  • For Teachers
    • Animal Quizzes
      • Amphibians Quiz
      • Bird Quiz
      • Cat Quiz
      • Dolphin Quiz
      • Insect Quiz
      • Reptile Quiz
    • Butterfly Life Cycle
      • Butterfly Metamorphosis
      • World’s Largest Butterfly
      • World’s Largest Moth
    • Metamorphosis – A Frog’s Life Cycle
    • The Cellular Structure of an Animal
    • Insect vs Bug
    • Animal Word Search
    • Coloring Pages
  • Study Guides
    • African Animals
    • Antarctica Animals
    • Asian Animals
    • Australian Animals
    • Central American Animals
    • European Animals
    • North American Animals
    • South American Animals
  • Diseases & Parasites
    • Bsal
    • Canine Distemper Virus (CDV)
    • Chronic Wasting Disease (CWD)
    • The Deadly Chytrid Fungus
    • All About Parasites
    • The Rabies Virus
    • White-Nose Syndrome
  • Contact
    • General Contact
    • Guest Article Submission
      • Guest Articles
        • Guest Articles – 2024
    • What Critter is This?
    • Animal Welfare Organizations
    • Privacy Policy
pacu

The Misunderstood Pacu

  • 14 December, 2022
  • Critterman
  • No Comments
  • 469 Views
  • 1 Likes
Daily Critter Facts, Fish Facts

The pacu is often misidentified as a piranha. While in the same family, they are different fish with far different behaviors. Pacus can be found in tropical and subtropical South America. They prefer lakes, rivers, floodplains, and flooded forests located in the Amazon, Orinoco, Río de la Plata Basins, São Francisco River, and in the Guianas. Generally speaking, these fish are listed from Least Concern to Endangered, based on the species of pacu.

First the Stats…

Scientific name: Piaractus
Weight: Up to 88 lbs.
Length: Up to 3.5 feet
Lifespan: Up to 15 years

Now on to the Facts!

1.) While related to piranha, there are several distinct differences that set them apart. For instance, the teeth of a pacu are square and non-serrated. Whereas the piranha has sharp and pointed teeth.

2.) Another difference is that pacu are omnivorous (eat plant and animal matter) and have a more docile temperament.

3.) Pacus also have less of an underbite and sometimes even a slight overbite.

4.) Finally, pacus get much larger than their sharp-toothed cousins.

5.) Pacus and piranhas are actually a characin fish, meaning that they are a type of tetra. Yep. The peaceful community fish you see in pet stores, the world over.

But wait, there’s more on the pacu!

6.) They are classified into the Serrasalmidae family. This means “serrated salmon family” and is in reference to the serrated keel running along their stomach.

7.) Unfortunately, some aquarists have released these fish into local waters. This is not only illegal, but highly advised against. These fish can quickly become invasive and devastate local aquatic fauna. Don’t be that person.

Did you know…?
In a strait between Sweden and Denmark, in 2013, a pacu was captured and it was then that they were labelled, incorrectly, as testicle biters. Due to their ability to crush tough tree nuts, the joke arose and caused a stir and a mislabeling.

8.) It is highly advised that if you no longer want a pacu, that you should rehome it to another aquarist’s set up or remove their head and discard the fish in the garbage. Or, better yet, if you won’t have the means to care for a full grown pacu, just don’t get them to begin with. Problem solved.

9.) In their native ranges, these fish are widely captured and even farmed for food.

10.) Due to their powerful jaws, special consideration should be taken when wishing to purchase a pacu. There was an incident where a toddler needed surgery after a pacu bit the child’s finger at Edinburgh Butterfly & Insect World, in Scotland. More of a parenting problem than a fish problem, if you ask me.

But wait, there’s still more on the pacu!

11.) These fish are popular game and food fish. Anglers travel from far and wide to capture wild specimens.

12.) Pacus lay only a single egg in their lifetime.

Did you know…?
Black and red-bellied pacus are the most commonly kept in the fish trade.

13.) Their diet consists of fruits, decaying plant matter, seeds, grains, snails, & other smaller fish.

14.) The primary predators are crocodiles and larger fish; not to mention humans.

15.) The pacu can swim up to 10 mph.

16.) The name pacu hails from the Tupi-Guarani language and it means quick eater.

Now a Short Pacu Video!

Be sure to share & comment below! Also, check out the Critter Science YouTube channel. Videos added regularly!

Want to suggest a critter for me to write about? Let me know here.

Think you know a lot about critters? Try your hand at these fun, free quizzes:

  • Bird Quiz
  • Reptile Quiz
  • Cat Quiz
  • Amphibian Quiz
  • Dolphin Quiz
AmazoneggfishfoodinvasivepacupetpiranhaSouth Americawater
Critterman

With over 50 years of critter experience to my credit and hundreds of zoology teaching hours to people around the world, I have amassed not only a continuing thirst for critter knowledge but a desire to teach others all I can about the majesty and wonder of our natural world. Critter Science is a culmination of such knowledge. I have hands on as well as book acquired intel on all kinds of critters. Whether they're on land, sea, or in the air. I will never say that I know everything about all animals. That's impossible, even for a savant. But, that being said, ask me any animal question and I'll answer it. If I don't know the answer, I'll get an answer for you!

The Yellow-Headed Amazon
The Great Eared Nightjar
Related Posts
  • Nepal house martin
    The Nepal House Martin 4 July, 2025
  • booted eagle
    The Booted Eagle 3 July, 2025
  • Wyoming toad
    The Wyoming Toad 2 July, 2025
  • Daily Critter Facts
  • Guest Articles
  • BYET
  • Teachers
  • Study Guides
  • Contact

Copyright © 2025, Critter Science. All Rights Reserved.