The family Notopteridae contains ten species of osteoglossiform (bony-tongued) fishes, commonly known as featherbacks and knifefishes. These fishes live in freshwater or brackish environments in Africa, and South and Southeast Asia.
With the denotation of "knifefish", the Notopterids should not be confused with Gymnotiforms, the electric knifefishes from South and Central America. Although their manner of swimming is similar and they are superficially similar in appearance.
Featherbacks have slender, elongated, bodies, giving them a knife-like appearance. The caudal fin is small and fused with the anal fin, which runs most of the length of the body. Where present, the dorsal fin is small and narrow, giving rise to the common name of "featherback". The fish swims by holding its body rigid and rippling the anal fin to propel itself forward or backwards.
I have the opportunity to fish this wonderful fish during their season period with my wife. They are strong fighter. Whenever they got hookup, they did aerobatic jump out of the water. The jump sights was awesome to watch !!!