Colombian Shark Catfish (Brackish)

The Colombian Shark Catfish (Brackish), scientifically known as Ariopsis seemanni, belongs to the Catfish family group. Adults reach a maximum size of approximately 35 cm and have a fusiform body shape with a fast growth rate. Classified as semi-aggressive, this species primarily occupies the mid-level and bottom zones of the aquarium and produces a extreme level of biological waste.

To thrive, the Colombian Shark Catfish (Brackish) requires a brackish required aquarium with a minimum volume of 380 litres and a tank length of at least 150 cm. Water temperature should be maintained between 22°C and 28°C, with a pH range of 7.5–8.5 and a general hardness of 12–30 dGH. A high water flow is preferred.

The Colombian Shark Catfish (Brackish) is a rewarding species to keep, provided its core environmental needs are met. This species is available in 2 varieties: Adult (Marine / High Brackish) and Juvenile (Grow-out). Each may differ slightly in size, temperament, or care needs, so it is worth checking the specific requirements of the variety you plan to keep.

When setting up an aquarium for the Colombian Shark Catfish (Brackish), a high water flow best suits their natural preferences. Because this species occupies the mid-level and bottom zones, the aquarium layout should prioritise open swimming space in the centre of the tank for free movement and sufficient floor space with hiding spots among rocks, wood, or dense planting. Useful additions include a sand substrate to accommodate their sifting behaviour.

Classified as semi-aggressive, the Colombian Shark Catfish (Brackish) is adaptable and can be kept singly or in a small group, offering flexibility when planning a community tank. When choosing tankmates, any fish small enough to fit in its mouth will likely be eaten, ornamental shrimp are not safe companions, and their energetic swimming style may stress more sedentary or timid species. Selecting tankmates that favour different water layers from the mid-level and bottom zones can help reduce competition and territorial overlap.

Colombian Shark Catfish (Brackish) is best for a fishkeeper who wants a species that can settle into a calmer community setup and can provide someone who understands its individual space requirements. It makes the most sense for a hobbyist who will actually build around its needs, especially sand.

The most common mistake is treating Colombian Shark Catfish (Brackish) like any other community fish and skipping the soft sand it needs to forage safely. Another frequent problem is forcing it into an over-busy community when it would do better with more room or more deliberate tankmate choices.

The Colombian Shark Catfish (Brackish) is a predatory species that will readily consume small fish, so nano or bite-sized tankmates should be avoided and will hunt and eat ornamental shrimp, making it unsuitable for shrimp-focused setups.