Only a very small number of products in the market can truly be called “blue bottom” or “over-the-back”, and those that can have both are even rarer. Some people think that gold cross-backs are less difficult to identify than red dragons. In fact, picking out a high-quality blue-background cross-back is a matter of great skill and requires courage and luck. Therefore, identifying the subtle differences in the appearance of fish at each stage and summarizing the construction methods of various color qualities are of great significance in determining the quality of fish.
First of all, "blue background" and "back" should be understood separately.
The so-called "blue background" can be understood in two ways. One is the inner part of the scales except the first and second scale frames; the second is the second scale frame and its inner side except the first scale frame. end". Because the definition of the second type is too harsh, as long as the fish has the first meaning, it is called "blue background over-back". According to this understanding, the over-back gold with blue color can be considered There are two types of golden hair color and golden hair color. The texture of the blue part of the fish scale base is also particularly important. Almost all juvenile over-backed goldfish have some blue tint, and a considerable number of them have silky golden hair color when they are young. Because golden dragons will show different levels of blue color when they are young, and the blue background gene is genetically a weak link, it is difficult to accurately predict the color development direction of a fish. However, blue arowanas always have something unique in common:
1. The texture of blue is a smooth blue that is common in velvet, and there is less of a cold feeling from metal colors such as iron blue (such When the fish matures, they mostly have a thick-framed blue background).
2. The blue area is large, covering the entire area from the second scale frame to the bottom of the scales. There should be no scales at all even in the fifth row of high-quality individuals.
3. The way of interfacing with gold is very special. The gold seems to be drawn on the outermost edge of the scales with a very fine pen, but it feels like it is on the same plane; if the gold is in the shape of loose gold sand or feels like If it exceeds the bottom of the scale, the possibility of eating the frame is greater.
4. The true blue color is often not very early, and the average fifth row of 20CM is 100% bright, and the small bead scale is more than 50% bright, which is basically suitable. If the fish in the sixth row of scales of this size has reached perfection, the golden color will easily dissipate after growth and become a mixture of gold and blue, and it will be particularly difficult to lock the frame.
From bodyIn terms of appearance, if you want to choose the foolproof blue arowana, some people think that a round face is more secure than a pointed face. Although there are not many pointed-faced arowanas with outstanding blue hair color, if we look back at wild populations, they mostly have round faces. In terms of the bloodline of the over-backed golden dragon, the round-faced fish may be considered purebred, while there are more fish with other bloodlines mixed in the pointed-faced fish. It has no potential, and it grows faster than the round-faced fish.
From around 30CM, the growth and hair color begin to wax and wane. This phenomenon is mainly reflected in the fifth row of scales. We must pay attention to the fullness and luminosity of the 5th row of scales at 20CM. At 20CM, if the brightness and texture of the fifth row of scales is similar to the brightness and texture of the scales in other parts of the body, it is more likely to become a blue arowana. On the contrary, if the brightness of the fifth row of scales is significantly higher than that of the other rows of scales, it seems to be a blue arowana. If the first layer of lacquer is extensive and there is only a glossy area outside the second scale frame, when it grows to 30CM, a narrow and long turbid scale area will easily appear between the first scale frame and the bottom of the scale, and the fifth row of scales that has already appeared glossy The bottom will also be relatively darker, which is the "absent" phenomenon of over-backed gold in the middle fish stage. Fish of this quality are quite common in the current market and should be carefully selected when purchasing. In various arowana competitions, this type of fish is generally not used in the middle fish category. This type of fish will usually return to the luster of the fifth row of scales when they reach adulthood, and the sixth row of scales will generally run across the back. However, this kind of fish has a very low chance of becoming a true blue arowana because the color of its scales has gone through a lot of changes when it comes to fish.
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