Identification technique of seedling quality of giant salamander

The giant salamander is commonly known as baby fish. As the seedling price of giant salamander is relatively expensive, many people who are ready to breed are worried about the problem of breeding. Especially at present, the giant salamander seedling market is not standard, and driven by high profits, some people deceive breeders with small salamander and other non-giant salamander seedlings. therefore, mastering the identification technology of giant salamander seedling quality is of great significance to the success of giant salamander breeding and the improvement of breeding efficiency. Based on many years' practical experience of artificial propagation and seedling cultivation of giant salamander, the author puts forward some views on the external morphology, external reaction and specifications of giant salamander seedlings.

External basic morphological characteristics of giant salamander

The basic morphology of giant salamander is as follows: the first-year-old salamander without gills is of good quality, which is dark red or with the same normal body color, and there is no damage. If seedlings with external Gill damage are found, they are easy to be infected with bacteria and difficult to feed. Excellent giant salamander over 1 year old requires that there is no external damage and no deformities, but attention should be paid to identifying several other species of tail animals with similar morphology. Table 1 lists their morphological identification methods.

External reaction

Stirring with hands, the limbs of giant salamander seedlings crawl forcefully at the bottom of the water, and the tail swings quickly in the water. After draining the water, let it crawl in the basin. Agile people are good breeds.

Specifications

Look at the uniformity of salamander seedlings, whether the same batch of seedlings grow evenly, similar specifications can be initially determined as better quality, weak seedlings are smaller than the same batch. In particular, the seedling growth rate of giant salamander with older head is slow and should not be selected. It is better for the trunk to be stout, but it is necessary to distinguish whether there are diseases such as abdominal distension and ascites.

Observe whether there is any disease or not

Due to poor feeding and management, some giant salamander seedlings are infected with diseases, which affect the quality. The specific observation methods are as follows: the limbs of giant salamander are not swollen, the abdomen is not swollen (abdominal flatulence is ascites disease), the gills of juvenile salamander (1 ~ 10 months old) are intact, there are no water mold parasitic on the gills, there are no white spots on the body surface, and the body shape is not too thin. the seedlings with these characteristics can be initially identified as excellent seedlings.

The quality identification of giant salamander seedlings should not only comprehensively consider the above factors, but also consider the feeding level and conditions of seedling donors. According to the experience of seedling cultivation, it is recommended that breeders buy about 50 million 250g of giant salamander seedlings to raise, so that it is easy to identify the quality, and the survival rate is as high as 100%.