The angel fish, also known as swallow fish, angel, little angelfish, small fin sailfish, etc., is of the genus Liidae, native to Guyana and Brazil in South America. Angelfish is 12-15 cm long and 15-20 cm high, with a small head and a pointed body, which is rhombus-shaped. The dorsal and anal fins are very long and straight like a jib, so they are called small-fin sailfish. Viewed from the side, the angelfish swims like a swallow soaring, so the angelfish is also called swallow fish.