堪称“鱼的活化石”的龙鱼，你真的了解它吗？

龙鱼历史悠久。据说它早在3.45亿年前就出现了。它可以被称为活化石。作为一种非常受欢迎的观赏鱼，它不仅外表霸气，还盛产“兄弟姐妹”。如果按照鳞片的颜色来分类，大致可以分为五大类：红龙鱼、金龙鱼、青龙鱼、银龙鱼和黑龙鱼。接下来，我们来谈谈这些龙鱼

1、种类和相应的价格

1，红龙鱼

作为亚洲种的红龙鱼，我们相对比较熟悉。它们的鳞片都是红色的，但红色的程度根据不同的品种而不同，有些是鲜红色的，有些是橙色的。有很多品种，如“血龙”和“胡椒龙”。根据产品外观、基因等因素，价格从2000元到2000元

2不等。金鱼

金鱼，你也可以根据它的名字看到它的特点。它全身金光闪闪，鳞片非常漂亮。在这个类别中，颜色基本相同，看起来非常高贵。在物种分类上，主要以一些形状特征来区分，如“金头金鱼”、“十字背金鱼”等，该鱼可以说是龙鱼的皇室。价格非常昂贵。按重量计算，每克约120元。一条1.5公斤的金鱼售价约为18万元

3。绿龙鱼

绿龙鱼在不同地区的外观差异较大，所以在物种分类上，主要是根据产地进行分类。总的来说，头是圆的，嘴是钝的。在几种龙鱼中，体型显得矮小。因为它没有金龙鱼和红龙鱼华丽的颜色特征，所以价格相对较平，大多在1000元以内。如果是年轻的绿龙鱼，它会更便宜

4。银龙鱼

银龙鱼，地理分布于亚洲、美洲和非洲。它的全身是银色的，在光线的照射下也可能呈现蓝色或粉色。还有一些变种，如“雪龙鱼”，全身雪白。银龙鱼的价格主要取决于大小，约20厘米，在50至70元之间；大约35厘米在90-100元之间；大约50厘米在150-250元之间；大约60厘米在300-500元

5之间。黑龙鱼

黑龙鱼全身黑色，体型与银龙鱼相似，但与金龙鱼和红龙鱼有很大不同。它整体上比较扁平和长，尾巴呈带状。背鳍和臀鳍呈带状，向后延伸至扇形尾部。它的价格略高于银龙鱼，但差距不大

2、正常寿命

龙鱼本身就是一种长寿鱼。如果是野生龙鱼，它甚至可以活30年。不过，目前市面上出售的龙鱼一般都是人工繁育杂交的。它们的外表可能很漂亮，但它们的预期寿命一般在6-7岁之间，很少超过10岁

3、繁殖周期

一般来说，龙鱼在3-4岁时性成熟，然后选择交配（它们非常抗拒人工强制交配）。产卵和孵化大约需要30天。之后，雄鱼需要至少两个月的养护才能再次繁殖和保护它们的卵，而雌鱼也需要三个月以上的养护才能下一批卵发育和成熟。因此，龙鱼的平均产卵间隔为三到四个月，一年可以繁殖两到三个窝。有关宠物的更多科普知识，请继续关注本网站~

The arowana, which can be called "living fossil of fish", do you really know about it

The arowana has a long history. It is said that it appeared as early as 345 million years ago. It can be called a living fossil. As a very popular ornamental fish, it is not only domineering in appearance, but also rich in "brothers and sisters". If it is classified according to the color of its scales, it can be roughly divided into five categories: red dragon fish, golden dragon fish, blue dragon fish, silver dragon fish and black dragon fish. Next, let's talk about these dragonfish

1、 The species and corresponding price

1, red arowana

As Asian species of red arowana, we are relatively familiar with it. Their scales are all red, but the degree of red varies according to different varieties, some are bright red, some are orange. There are many varieties, such as "Blood Dragon" and "Pepper Dragon". According to the product appearance, gene and other factors, the price varies from 2000 to 2000 yuan

2. Goldfish

Goldfish, you can also see its characteristics according to its name. Its whole body is glittering with gold, and it has very beautiful scales. In this category, the color is basically the same, and it looks very noble. In terms of species classification, it is mainly distinguished by some shape characteristics, such as "golden head goldfish", "cross back goldfish", etc. The fish can be said to be the royal family of the arowana. The price is extremely expensive. It is about 120 yuan per gram based on the weight. A 1.5kg goldfish costs about 180000 yuan

3. Green arowana

The appearance of green arowana in different regions is quite different, so in terms of species classification, it is mainly classified according to the origin. On the whole, the head is round and the mouth is blunt. Among several kinds of arowana, the body size appears short and small. Because it does not have the gorgeous color characteristics of the golden arowana and the red arowana, the price is relatively flat, mostly within 1000 yuan. If it is the young green arowana, it will be cheaper

4. Silver arowana

silver arowana, geographically distributed in Asia, America and Africa. Its whole body is silver, and it may also appear blue or pink under the illumination of light. There are also some varieties of variation, such as "snow dragon fish", whose whole body is snow white. The price of silver arowana mainly depends on the size, about 20 cm, between 50 and 70 yuan; About 35 cm is between 90-100 yuan; About 50 cm is between 150-250 yuan; About 60 cm is between 300-500 yuan

5. Black arowana

Black arowana is black all over, and its body shape is similar to that of silver arowana, but it is very different from that of golden arowana and red arowana. It is relatively flat and long on the whole, and its tail is in a belt shape. The dorsal fin and hip fin are in a belt shape and extend backward to the fan-shaped tail. Its price is slightly higher than that of silver arowana, but the gap is not large

2、 Normal life span

The arowana itself is a long-lived fish. If it is a wild arowana, it can even live for 30 years. However, at present, the arowana sold on the market are generally artificially bred and hybridized. Their appearance may be pretty, but their life expectancy is generally between 6-7 years, and rarely more than 10 years

3、 Reproduction cycle

Generally, arowana mature sexually at 3-4 years of age, and then choose to mate (they are very resistant to artificial forced mating). It takes about 30 days for spawning and hatching. After that, male fish need at least two months of maintenance before they can reproduce and protect their eggs again, while female fish also need more than three months of maintenance before the next batch of eggs can develop and mature. Therefore, the average arawana spawning interval is three to four months, and it can breed two to three nests a year

Well, today's arowana sharing will be here first. For more popular science knowledge about pets, please continue to pay attention to this site~