How to identify the quality of giant salamander seedlings

Giant salamander commonly known as baby fish. Because giant salamander seed price is relatively expensive, many preparation breeders worry about seed problem. Especially at present, the giant salamander seed market is not standardized, and driven by high profits, some people cheat the breeders with non-giant salamander seeds such as Hynobius davidianus. Therefore, it is of great significance to master the identification technology of the quality of giant salamander seed, whether the giant salamander breeding is successful or not, and improve the breeding benefit. Based on the practical experience of artificial propagation and seedling breeding of giant salamander for many years, some opinions are discussed from the aspects of external morphology, external reaction and specification of giant salamander seedlings.

Basic morphological characteristics of giant salamander

The basic morphology of giant salamander is as follows: the first-year-old salamander without gills has dark red outer gills or the same normal body color, and has no damage. If the fry with outer gills damage is found, it is easy to infect bacteria and difficult to feed. The requirements of excellent giant salamander above 1 year old: no external damage, no deformity, but pay attention to identify several other cauda animals with similar morphology, table 1 lists their morphological identification methods.

external reaction

Agitating with hands, giant salamander seedlings crawl powerfully under water and swing their tails quickly in water. After draining the water, let it crawl in the basin, and the agile one is an excellent salamander species.

specifications

According to the uniformity of salamander seedlings, whether the same batch of seedlings grow evenly, the specifications can be preliminarily determined as better quality, and the specifications of weak seedlings are smaller than the same batch. Especially the giant salamander with longer head grows slowly and should not be selected. The trunk was thick for good, but to distinguish whether there is abdominal distension ascites and other diseases.

Watch for symptoms.

some giant salamander fry were infected with diseases due to poor breeding and management, affecting their quality. The specific observation methods are: the limbs of giant salamander are not swollen, the abdomen is not swollen (abdominal distension is ascites disease) , the gills of juvenile salamander ( 1~10 months old) are complete, the gills are free of water mold parasitism, the body surface is free of white spots, and the body shape is not thin. The seedlings with these characteristics can be preliminarily classified as excellent seedlings.

The quality identification of giant salamander seedlings should consider the above factors comprehensively, in addition, the feeding level and feeding conditions of the seedlings should be considered. According to the breeding experience, it is suggested that the breeders buy 50~250g of giant salamander seedlings, so that it is easy to identify the quality of good and bad, and the survival rate is as high as 100%.