Knobnose Whiptail Catfish

About

The Knoknose Whiptail Catfish (Hemiodontichthys acipenserinus) is one of the more unusual-looking loricariids you'll come across, with a diamond-shaped body when viewed from above and a distinctively enlarged, bulbous rostrum that gives it both of its common names. Its resemblance to sturgeons is actually referenced in the scientific name, and it's so morphologically distinct that it sits alone as the only species in its genus. In the wild it ranges across several major South American river systems including the Amazon, Essequibo, Oyapock, and Paraguay basins, where it lives close to sandy substrates and picks through the sediment for worms and small crustaceans. It can also breathe air when conditions call for it, which is handy to know during the acclimatisation period. Newly imported fish can arrive oxygen-stressed and need careful handling. Once settled, though, it is a manageable fish for an intermediate keeper. It is genuinely shy and will lose out at feeding time to anything boisterous, so small characins, Apistogramma species, and similarly gentle Corydoras make the best tankmates. The reproductive behavior is the real draw here: males develop an elaborate fleshy lip structure and carry fertilized eggs attached to their mouthparts, ventilating them through deliberate movement for up to two weeks. Breeding is possible in captivity but takes some patience and preparation.