Dayun Er's inventory of pet fish "swordtail fish"

[Common name alias] Swordfish

[Latin scientific name] Xiphophorus helleri

[Geographical distribution] North America, Central America, Mexico, Guatemala, and later introduced to Africa and Sri Lanka

[Adult length] 10.0 to 12.0 cm

[Temperament] mild

[Suitable temperature] 21.0 ~ 28.0 °C

[pH] PH 7.0 ～ 8.0

[Hardness] dGH 12.0 ~ 18.0 N

[Activity level] top level

[Breeding method] Oviparous birth

The swordtail is a genus of oviparous medaka family. The lower lobe of the caudal fin is long, like a long sword, sometimes up to twice the length of the body, and is a tropical freshwater fish species that is easier to keep. The physiological development of the swordtail fish has a sexual reversal phenomenon, and the fish that complete the sexual transformation have male habits and functions, and the reproductive method is similar to that of peacock fish.

The body of the swordtail is olive or red , with a dark red stripe in the middle of the sides , from behind the gill cover to the tail , with light blue trims above and below. There are erythemas on the dorsal fin.

The most prominent symbol of the swordfish is that the lower end of the tail fin of the male fish is extended like a sword, and the sword is longer than the body length, hence the name. The tail of the sword is green or orange with black edges. Females are inferior in color to males and have no sword tail. Swordfish are easy to hybridize, hybridize with moonlight fish and are continuously cultivated by artificial selection, and there are varieties of different colors such as red sword, yellow sword, mandarin duck sword and so on. The red sword with its whole body red color was as gorgeous as red velvet. The tail sword has a single sword and a double sword. Swordfish have a strong adaptability, in the water temperature of 20 ~ 25 ° C, weak acidic, neutral or slightly alkaline water, can grow and reproduce, the most suitable growth water temperature of 24 ° C. Omnivorous, tropical fish love to eat bait, artificial feed, it all feeds. Although swordfish are equipped with "swords", they are not belligerent, on the contrary, they have a gentle and kind personality, and never bully the weak or different kinds. Easy to polyculture with other tropical fish. Hybridized breeds, such as red swords, grow fast, have strong physiques, are easy to raise, and have more ornamental value.