Eels are sexually reversible, starting as females and changing to males later in life. Therefore, accurate identification of male and female eels is generally required before the breeding season. Experienced farmers can also utilize their individual differences, growth cycles, and appearance to make more accurate inferences.

First, when the breeding season comes, eels will show easier to identify the characteristics:

1, female eel characteristics: female eel's abdomen is enlarged, the eel body abdomen is translucent pink, visible in the belly of the egg particles, the genital pore is red, swollen, enlarged.

2, male eel characteristics: male eel abdomen almost no protruding feeling, the abdomen has a network of blood distribution, the genital pore is red, swollen, slightly protruding.

Second, from the individual differences inferred from the male and female eels.

1, the eel full length of 24 centimeters below the individual, are female.

2, the length of 24 ~ 30 centimeters of individuals, male accounted for 5.2%.

3. 41.3% of individuals with total length of 30-36 centimeters are male.

4. For individuals with a total length of 36 to 42 centimeters, males accounted for 90.7%.

5. All individuals over 50 centimeters in length are male.

Third, from the growth cycle inferred eel male and female.

1, its early seedlings are all female.

2, body length of 24 centimeters, the beginning of sexual reversal, for hermaphrodites.

3. Female eels become male after laying eggs.

Fourth, the eel can be identified from the appearance of male and female.

1, the female eel individual head is small and not bulging. Its temperament is gentle, not good at jumping.

2, the male eel individual head is larger than the female, slightly bulging. It is active and good at activities, and struggles strongly