Banded Banjo

About

The banded banjo (Platystacus cotylephorus) is one of those fish that genuinely makes you do a double-take. Its flattened, mottled body is shaped to resemble a dead leaf so convincingly that it will simply drift motionless in the current when released into a tank, rather than swim. Native to coastal river systems from Venezuela down into northern Brazil, it lives primarily in brackish, turbid shallows near river mouths, where blending into soft, muddy substrates is a serious survival strategy. This species is largely nocturnal and secretive, spending daylight hours hidden and nearly immobile, so it is best suited to a keeper who appreciates unusual behavior over constant activity. At feeding time after lights-out, though, it becomes noticeably more animated. What really sets this fish apart is its reproductive biology: spawning females develop clusters of fleshy, stem-like structures called cotylephores on their undersides, and eggs attach directly to these, possibly receiving oxygen or nutrients through them. A mammal-like arrangement that is almost unheard of among fish. Breeding in captivity has rarely been completed, though egg-carrying females have occasionally been imported successfully. A peaceful species that gets along with its own kind, it is a rewarding project fish for intermediate keepers with a taste for the genuinely unusual.