I. Morphological characteristics of silver arowana
The silver arowana has a silver body, a large body, a flat and long body, a pair of tentacles at the tail of the snout, bright eyes and full of energy, which is especially attractive. The dorsal fin of the juvenile arowana is pink, with some bluish tinge in between, silvery and pinkish overall. The silver arowana grows rapidly, and by the time of adulthood, the scales are semi-circular and the body is silver with a tinge of blue. The edges of the scales are slightly pinkish, and the scales are shiny and silvery.
Silver arowana usually lives in the upper layer of the water body, and can live alone or in groups, and get along well, but the same-sex arowana may occasionally fight with each other during the breeding period; it likes to jump every day, mainly Eat insects, small fish and other foods; long life, fast growth, and some can be as long as 1 meter or more, so pay attention to providing it with a spacious living environment.
Second, the breeding method of silver arowana
Buy for use Breeding broodstock should have the following conditions: healthy limbs without disability, robust body shape, no disease, bright scales, crystal clear, smooth and neat scales, stable swimming posture, complete fins without defects, etc. It is recommended to choose broodstock according to the ratio of one female and one male to ensure that the sperm count of male silver arowana is sufficient and the fertilization rate is improved. In addition, to select broodstock, it is recommended to select according to the following references: male silver arowana is 6-8 years old, body length 50-60cm; female silver arowana is 7-9 years old, body length 40-50cm. When the dragon fish lays eggs, be careful not to frighten it, otherwise the male fish will be unwilling to release sperm, which will affect the fertilization of the eggs. Therefore, during the breeding period of arowana, special attention should be paid to creating an absolutely quiet environment for the arowana and keeping the environment relatively stable. Changes in the environment cause the dragonfish to startle and even cause them to eat all their eggs, such as changes in lighting. While keeping the aquarium quiet, block some of the aquarium’s sunlight, and at the same time properly strengthen the lighting.
Arowana usually spawns around 10:00 during the day, but some Arowana spawn at 15-16. Arowana is a mouth-brooding fish. When the eggs are fertilized, the male fish will immediately put all the eggs into the mouth. On average, a male fish can contain about 40 to 50 eggs at a time. After the male fish holds the eggs in his mouth, his mouth will often wriggle or shake his head to maintain his balance. At this time, the female fish acts as a guard to protect the male dragon fish, spreading its pectoral fins horizontally in a unique defensive posture. During the hatching period of fish eggs, it is best to keep the water temperature at 26 ℃ ~ 28 ℃. About two months or so, the fry begin to swim in and out of the male’s mouth, with a body length of about 6-8cm. This movement of fry in and out usually lasts about a month.
