Mary fish can distinguish male and female by observing their appearance. The male's dorsal fin is longer, extending to the caudal fin, its anal fin is more pointed, oestrus will actively chase the female fish. The anal fin of the female is round, and the female is often the one being chased during estrus. Through these characteristics, we can identify their male and female.
Most fish are oviparous, female fish lay eggs, male fish ejaculate sperm, usually in vitro to become fertilized eggs, and then hatch into small fish. But Mary fish is an exception, its small fish is directly born out, but in fact is not viviparous, but egg viviparous. The fish needs internal fertilization, and the eggs are hatched in the female's body and released after hatching.
1. Morphological characteristics: The front part of the body of Mary fish is wedge-shaped, and the back is flat. The head is large, the mouth is short, and the eyes are on both sides. It has large scales on its body surface, 7-9 rows of black-brown longitudinal lines, longitudinal lines on the lower part of the dorsal fin, transverse lines in the middle, and punctate lines on the upper part. In addition, the caudal fin has dark spots, others are gray-white.
2. Growth habit: Mary fish is a tropical fish. It has strong adaptability. It can grow in relatively dirty waters and can tolerate low dissolved oxygen. It usually feeds on algae and organic debris, inhabits freshwater areas, and also occurs in estuaries or coastal areas.
