Koi fish is famous for its unpredictable patterns, which are the most intuitive things we can see. When viewing, it should be judged according to the requirements of different koi fish varieties for different colors and patterns. For example, red and white koi fish depends on whether the white matter is pure enough, whether the lungs are thick enough, and whether the lungs are evenly distributed and naturally not stiff.
2. Look at koi fish's figure:
Some people value shapes more than patterns, while others value patterns more. This is to see the need. Generally speaking, koi fish's figure should be relatively smooth, and koi fish's so-called "living gem in water" shows the importance of swimming posture to it. You have to have a good figure to have a good swimming posture. Then how to choose koi fish with a better figure? I usually look at the head first, and then at the performance of koi fish's fishtail, which is mostly the overall performance of koi fish.
3. Look at koi fish's swimming posture:
Choose a smooth and natural swimming posture, and there will be no abnormal phenomena such as sideways swimming and tilting.
4. Look at the integrity and luster of fish scales and fins in koi fish:
These points are also very intuitive, so we must look carefully. I saw the pectoral fin move once when I picked it, but I didn't look carefully. As a result, when I went home to swim, I found that the main bone of pectoral fin was broken, and it has not recovered yet. As a lesson, fish friends should learn from it.
5. When you see koi fish, you can see obvious diseases:
There are seven common diseases in koi fish:
(1) White spot disease: There are small, white and small white spots in koi fish, also known as small melon worms. Don't choose this koi fish. If the little melon bug gets into the gills, it's almost hopeless.
(2) Mildew disease: white hyphae appear in the easily scratched parts on both sides of the fish belly.
(3) White fog: there is white frost on both sides of the fish belly.
(4) ichthyosis: ichthyosis, like human lice, is a common ectoparasite.
(5) Vertical scale disease: fish scales stand upright.
(6) Insect disease: Fish suffering from this disease like to swim nearby.
(7) Floating head: it is characterized by isolation, head up, tail down, and a little hypoxia in the water, especially in dog days. It may also be that there is something wrong with the swim bladder, which is difficult to cure. In addition to these fish diseases that can be directly seen with eyes, there are many diseases in koi fish that are caused by improper daily feeding, which need the attention of fish friends themselves.