Tete Sea Catfish

About

The tete sea catfish (Ariopsis seemanni) is one of those species that the hobby has a complicated relationship with. As a juvenile of 2 to 3 inches, it comes across as a sleek, silvery little fish that seems perfectly manageable, but it grows large, lives a long time, and has needs that most home aquariums simply cannot meet. Native to coastal and brackish waters from El Salvador to Panama, it also ventures into medium and large rivers during early life as part of a fascinating migratory cycle. Males actually brood eggs in their mouths in the ocean before traveling upstream to release fry into freshwater. Adults shift toward full marine conditions, which creates a real challenge for anyone hoping to keep this species for its full lifespan. Temperament-wise, it will readily eat anything small enough to fit in its mouth, but it tends to be peaceable with its own kind and actually does better in a group. That said, it goes through periodic bouts of frantic swimming that are thought to be connected to migratory instincts. One detail that cannot be overstated: the base of the first dorsal spine carries venom glands, and a puncture can cause a seriously painful reaction requiring prompt first aid. It also produces audible grinding sounds through its pectoral fins, which it likely uses to communicate with tankmates. This is a species for dedicated, well-equipped keepers only.