English name: BlackGhostFishLatin name: ApternotusalbifronsAlias: Devil Knife fish, Devil Flying Knife, Dorsal Finless Eel, MonkfishThere are also people in China commonly known as Black Devil. The black ghost fish is native to the Amazon River Basin of South America. It is a large fish with a body length of 45-50 cm. The appearance is unpleasant black, the caudal stalk protrudes like a rod, the juveniles have white lines, the body is knife-shaped, the side is flat, there is no dorsal fin, the anal fin is broad and developed, and the white spots on the caudal fin of the adult fish will degenerate and disappear as they grow. There is also a brown variety of the same species, which aquarists call the coffee devil. The way the nigger fish swim is to move forward and backward with its long tail fin waving in waves, sometimes swimming upright, sometimes lying down and sleeping. The eyes have degenerated, and I can barely see anything, but only feel light and dark. Because the body emits a weak electric current and has the function of radar, it is good at swimming. Its dexterous and wonderful swimming posture is like a black feather dancing in the wind, which makes people like it. Niggas like nocturnal life, most of the time, they hide in the dark environment such as densely planted water and grass, crevices of rocks and sinking trees. The suitable water temperature of black ghost fish is 24-26℃. It is sensitive to water quality and prefers weakly acidic soft water. They are extremely strong and rarely get sick. The black devil likes to eat live animal bait, but it is also very easy to accept all kinds of artificial bait. The fish are very mild and can be mixed with most tropical fish. However, adult fish will eat small fish, so special attention must be paid to it. It is said that the reproduction of the black ghost fish is very difficult, and so far no one has successfully reproduced it in a captive environment.