1. Morphological characteristics of arowana
Although it is named arowana, the scales of arowana in its infancy are silv
1. Morphological characteristics of arowana
Although it is named arowana, the scales of arowana in its infancy are silver and slightly dark green; The scale frame is pink, the lips must be reddish, and the last three fins are evenly red. Adult arowana is about 60cm long, with golden yellow body, red-gold scales, crimson mouth, fins and gill cover, and attractive red light all over the body. The most striking feature of arowana is the special red plaque on the gill cover.
Arowana can be divided into 1 arowana and 2 arowana according to different habitats. 1 Arowana is red in color, and can also be subdivided into blood arowana and pepper arowana. Pepper arowana is the best of arowana, and its gill cover and scale frame are red. The color of No.2 arowana is mostly orange. Although its appearance is similar to that of 1 arowana, if we look closely, we can find that 1 arowana has a special red mark on its gill cover, and the mark is bigger and deeper, while No.2 arowana has no such mark.
Second, the color change of arowana
1. The color of adult arowana will appear in stages with the increase of age. The color of blood arowana generally appears earlier, while the color of pepper arowana appears later. At the same time, the color of arowana will change with the change of environment, so the lighting and the color around the aquarium have the effect of attracting color to arowana. Usually, red light and dark background can be used to attract colored arowana.
The water temperature of 2.26℃ ~ 30℃ is relatively suitable for the deposition of red pigment of arowana, and weak acidity and stable pH value are also beneficial to the hair color of arowana.
3. In the aquarium of arowana, you can add some local raw water and put some dry leaves in it to stimulate the color of arowana. In addition, more astaxanthin and carotene can be added to the blood arowana, which is beneficial to stimulate the red pigment in its scales. However, in the juvenile and sub-adult stages of red pepper arowana, we should be careful not to feed it with plant lights and food with hair dyeing function, because this will lead to a deeper background color of arowana. Wait until the green background of its body deepens, and then feed it some color-enhancing foods such as astaxanthin to induce arowana to turn red.
4. When purchasing arowana, pay special attention to whether its tail fin, dorsal fin and ventral fin are red, and the pectoral fin should be reddish; The body has a light green or pink luster, and the scales are shiny; The tentacles and lips are red or pink, so the quality of red fish is relatively high.
The above is the introduction of the morphological characteristics and the main points of coat color of arowana marginata. I hope all the farmers can cultivate colorful arowana.