CATDOLL : CATDOLL: Are male and female eels differentiated?

Sex Identification of Yellowtail Eel

Rice field eels are sex-reversible, they are female at first and turn into males later. Therefore, accurate identification of the sex of rice field eels is generally required before the breeding season arrives. Experienced breeders can also make more accurate inferences based on individual differences, growth cycles, and appearance.

1. When the breeding season comes, the eels will show characteristics that are easier to identify:

1. Characteristics of female eels: The abdomen of female eels is swollen and translucent pink, and the eggs inside the abdomen can be seen. The reproductive opening is red, swollen and swollen.

2. Characteristics of male eels: There is almost no protruding feeling in the abdomen of male eels, there are reticular blood threads distributed on the abdomen, the genital opening is red and swollen and slightly protruding.

2. Infer the gender of eels based on individual differences.

1. All eels with a total length of less than 24 cm are female.

2. Among individuals with a total length of 24 to 30 cm, males account for 5.2%.

3. Among individuals with a total length of 30 to 36 cm, males account for 41.3%.

4. Among individuals with a total length of 36 to 42 cm, 90.7% are males.

5. All those with a total length of more than 50 cm are males.

3. Infer the gender of eels from their growth cycle.

1. All the initial seedlings are female.

2. When the body length reaches 24 cm, it begins to reverse sex and becomes hermaphrodite.

3. The female eel turns into a male after laying eggs.

4. The gender of eels can be identified from their appearance.

1. The female yellow eel has a small head without a bulge. It has a gentle temperament and is not good at jumping.

2. The head of male yellow eel is larger and slightly raised than that of female. They are active and good at moving, and they struggle vigorously.

Eels are sex-reversible, first female and then male throughout their lives. From the embryonic stage to sexual maturity, that is, eels 1-2 winters old, those with a body length of less than 30 cm are generally female. After the female eel lays eggs, it enters the intersex stage, during which the eel has no reproductive ability and its gender is difficult to identify. With the increase of age and body length, the female ovary gradually turns into a testis, transitioning to male. Eels with a body length of more than 50 cm are generally male, and they remain male throughout their lives.

The sexual reversal of eels is affected by nutrition, and sex reversal is advanced when food is scarce. During the breeding period, female eels should be fed with high-calorie, high-protein, and high-vitamin feed, which is conducive to the reproduction and growth of eels. Because the growth rate of male eels is more than twice that of female eels, if necessary, masculinizing eels and skipping the breeding period can increase economic benefits.

Table for identifying male and female eels

Male intersexual male

Under 30cm 30-50cm Over 50cm

The abdomen is round and soft, gray or difficult to identify, and generally does not have a female head that is triangular and has mink-like spots on the back.

The ovary shows male characteristics, has no reproductive ability and is yellow in color. The abdomen is hard with blood streaks and the body struggles vigorously.

Eels have the ability to reverse sex, first becoming female and then male throughout their life.

Eel, also known as yellow eel, long fish, scaleless prince, sea snake, maggot fish, yellow maggot, etc., has delicious taste, few bones and thick meat. It often lives in the muddy bottom of rice fields, creeks, streams, ponds, canals, lakes, etc. It is produced in various parts of China, with higher production in the Yangtze River Basin, Liaoning and Tianjin. The production period is from June to October, and the ones produced from June to August are the fattest.

The eel is cylindrical and snake-like in shape, with a thick head and a thin tail. It has a smooth mucous membrane on its body surface, no scales, and is yellow-brown in color. There are irregular dark spots on its body, and its fins are underdeveloped and basically absent. It has only one three-sided spine on its body, and its meat is tender and delicious.

Yellow eel meat is tender and delicious. It has high nutritional value. Eel is rich in DHA and lecithin, which are the main components of the cell membranes of various organs and tissues in the human body and are indispensable nutrients for brain cells.

According to American experimental research data, regular intake of lecithin can improve memory by 20%. Therefore, eating eel meat has the effect of nourishing the brain and strengthening the body.

The special substance "eel element" it contains can lower and regulate blood sugar, and has a good therapeutic effect on diabetes. In addition, it contains very little fat, so it is an ideal food for diabetic patients. The amount of vitamin A contained in eel is surprisingly high.

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