What Are Some Interesting Facts About Pacu Fish

Are you curious about the mysterious underwater world of exotic fish? If so, the pacu fish may be the aquatic marvel you’ve been searching for. Pacu fish are an intriguing addition to any aquarium because of their startling resemblance to piranhas and their teeth, which are startlingly similar to human teeth. We are going to provide exciting facts about aquarium Pacu Fish, their distinctive characteristics, and the requirements for keeping them in an aquarium.

What is a Pacu Fish?

Pacu fish, scientifically classified as Piaractus brachypomus, Piaractus brachypomus is the scientific name for the pacu fish, which are native to South America’s Amazon Basin. These amazing fish resemble piranhas remarkably, but they differ from them in several ways, including their food and behavior.
aquarium pacu fish
The enormous size of pacu fish is one of their most distinctive features. They can reach amazing lengths of three feet or more and weigh up to 55 pounds! Pacu fish stand out in aquariums thanks to their unusual body shape and smooth, silver scales. However, their distinctive set of teeth, which uncannily resemble human molars, is what distinguishes them from other fish. In the world of aquatic curiosities, these “fish with human teeth” have earned them a unique position.

The Pacu Fish with Human Teeth

The pacu fish’s human-like teeth are one of its most fascinating characteristics. These fish have teeth that are square and flat, similar to human molars. While their teeth are not as sharp as those of their piranha relatives, they are extremely robust and well-suited for breaking nuts and seeds, which make up a large amount of their diet in the wild. Pacu fish are known to shatter open hard-shelled fruits and nuts that fall into the water with their muscular jaws.

Although pacu fish are not normally violent toward humans, there have been some concerning situations. A myth of pacu fish attacking human testicles got them the nickname “ball-cutter.” Such incidents, however, are extremely unusual, and pacu fish are not generally seen as a threat to swimmers.

Pacu fish are unlikely to use their distinctive teeth for anything other than eating their favorite meal in an aquarium. Indeed, many aquarists find their teeth fascinating to observe. However, to keep your pacu fish’s teeth healthy and effective, you must provide them with a well-balanced diet.

Keeping a Pacu Fish in an Aquarium

If you’re thinking about introducing a pacu fish to your aquarium, there are a few things you should consider ensuring their health and happiness.

Fish Tank Layout

Pacu fish require a huge tank due to their size. For a single adult pacu, a tank size of 200–300 gallons is recommended, and if you intend to keep more than one, you’ll need even more space. Because pacu fish are notorious for jumping, the tank should have solid, secure lids.

Pacu fish are generally bottom dwellers, therefore providing them with a substrate that resembles their native habitat is important. Fine gravel or sand is a good choice, and the tank should be decorated with rocks and driftwood to provide hiding places and cover for your fish.
fish with human teeth

Aquarium Equipment

Maintaining water quality is critical for the health of your pacu fish. A strong filtering system capable of handling the considerable amount of garbage they generate is required. Furthermore, regular water changes are essential for keeping the tank clean and safe for your fish.

A strong heater and thermometer are required to keep the water temperature between 72 and 82 degrees Fahrenheit (22 and 28 degrees Celsius). Invest in a dependable water-testing kit to check parameters like pH, ammonia, nitrite, and nitrate levels.

Tank Water Quality

Pacu fish are susceptible to changes in water quality, therefore keeping circumstances steady is critical. Regular water testing and filter maintenance are required to preserve your fish’s health. Opt for a pH between 6.5 and 7.5, and keep ammonia and nitrite levels as low as possible. Regular water changes are required to keep nitrate levels under control.

Lighting and Temperature

Pacu fish are generally light-adaptable, however providing them with a natural day-night lighting cycle is beneficial. Standard aquarium lighting can be used, and a timer can help adjust the lighting schedule.

It is critical to keep the water at the proper temperature. An aquarium heater with a thermostat is required to keep the water temperature within the acceptable range.


Pacu fish are omnivorous, meaning they consume both plant matter and small aquatic organisms. They can be fed a diet of high-quality pellets, veggies, and occasionally live or frozen food, such as small fish, shrimp, or worms, in captivity. To address their nutritional demands and support healthy teeth, serve a range of foods on schedule.


Pacu fish, with their human-like teeth, are more than simply a curiosity. They are exceptional aquatic organisms with distinct characteristics and care needs. If you want to add a pacu fish to your aquarium, ensure it has enough space, good water quality, and well-balanced food.

The pacu fish can thrive and become an intriguing addition to your underwater world with the proper setup and care. So, if you’re looking for a new aquatic experience, consider introducing the interesting pacu fish to your aquarium. Their attractiveness and individuality will undoubtedly make them popular among your aquatic pals.

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