2. The shape of the fish is long banded, flat sideways, body length up to 1m, weighing 7kg. The abdomen is rounded and the back of the juvenile fish is straight, with the back slightly curved towards adult fish. Five rows of coarse scales are arranged neatly on both sides of the fish, the lateral scales are 21-24; the caudal fins are fan-shaped and peach-shaped; the dorsal, caudal and anal fins are not connected, the dorsal and anal fins are ribbon-shaped, extending backwards Tail handle base. The head is spoon-shaped; the eyes are large; the mouth is large; the mouth is cracked diagonally, and the length exceeds the position of the eyes; the teeth are sharp and pointed, and the mouth is square; the jaw protrudes from the upper jaw, and has a pair of large, straight and upward-facing tentacles . Juveniles have a blue body color, and dorsal fins and anal fins have red edges.
3. Rearing aquariums should be spacious and over 140cm in length. Aquariums should not be planted with aquatic plants so as not to affect their swimming; do not lay sand, otherwise they will scratch the skin and cause infection. If you need landscaping, put some pebbles or stone on the bottom of the box. Arowana has a strong jumping ability and may leap out of the water, so the aquarium should be covered.
Arowana has a high appetite and a fierce temperament that can devour small fish, so it is not suitable for polyculture with other fish. Hi weak acidic or neutral soft water, pay attention to remove chlorine or fluoride in water. Feeding water temperature at 24 ~ 28 Â°C, the pH value is controlled at 6.5, it is best to change a small amount of fresh water every day or every other day, each time changing the water about 1/5 to 1/4 of the replacement of aquarium water. Healthy arowanas stretch when swimming, especially when turning, the pectoral fins are fully open and the tentacles are completely straight.
4. The reproductive age of females is generally 3 years, while males are 1 year later than females. The fish has a strong mate preference. Therefore, before breeding, several tailed male and female fish should be mixed together to allow them to adapt to each other. Breeding aquariums should be as large as possible without any objects. The water temperature is preferably 26-30Â°C and the pH is about 7. The peak period of spawning is from July to December.
Once sexually mature, the male and female brood fish are placed into the breeding box at a ratio of 1:1. The broodstock swims in the aquarium and ovulates and ejaculates in the swim. Each time about 40 to 100 eggs are laid, the egg diameter is 1.1cm, and the production is twice a year. Its reproductive characteristics are similar to those of ordinary mouth-incubated fish. Females produce eggs. Males contain all of the fertilized eggs in the mouth. A fish can contain approximately 40 to 50 capsules at a time. The females will hatch the remaining eggs in their mouths. After the broodstock contains the fertilized egg in the mouth, it constantly acts as a mouthpiece, allowing the water to flow in the mouth, and the egg is rolling in the mouth as the clothes are in the washing machine.
5. Fertilized eggs are hatched in the male fish mouth after about 1 month. The larvae swim out of the broodstock and gather near the male fish; the male fish opens at night and the larvae all return to their mouths.
After 8 days, the larvae began to feed on their own, and at this time they could feed red worms. This fish is naturally aggressive. Juveniles are different in size and prone to bullying and polarization. Therefore, it is better to keep the larger, more aggressive juveniles individually.
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