In the process of aquaculture special aquatic products, scientifically distinguish the male and female parents, and a reasonable match, can improve the artificial reproductive effects and benefits. The following describes several common special aquaculture species male and female identification methods.
1. Shrimp sexually matured green prawns, males are larger and stronger than females; males of sexually matured prawns are more powerful than females in the second step, usually 1.5 times longer than females; female prawns are fourth and fifth in ventral size. The distance between the bases of the step foot is wide, and it is arranged in an "eight" shape. The distance between the bases of the stepped males is relatively narrow, and there is a small protrusion on the inside of the bottom of the fifth step foot, which is the opening of the vas deferens. On the inner edge of the inner limb of the male second abdominal foot, there is a rod-shaped male appendage, whereas the female does not have this structure.
Second, turtle turtle individual large, short and thick trunk, the same age male small individual, thin and long trunk; female turtle shell is brownish yellow, male turtle shell is dark black; female tail short and thick, tail The base of the base is relatively small, the end of the soleplate is relatively straight, the inside is concave and shallow, the tail of the male is slender, the base of the tail is thick, the bottom is sharp and pointed, the concave is long and deep; the female turtle has no odor Males have special odors.
3. Within the same population of bullfrogs, male frogs grow rapidly and individuals are larger, while females have slower growth and smaller individuals; male frogs are dark brown in color and often have small warts. Female frogs have a smooth back and green; Frog tympanic membrane diameter than the eye, tympanic membrane and eye diameter ratio of 1:0.9, female frog tympanic membrane diameter slightly smaller than the eye, tympanic membrane and eye diameter ratio of 1:1.1; male frog thumb developed inside the mat, The reproductive season is particularly noticeable, while the female frog is non-married; the female frog's throat is gray-white and has no vocal sac, while the skin of the male frog's throat is golden yellow with a pair of ribbon-like cysts that can produce sounds.
Fourth, the main difference between male and female broodstock: leather male body elongated, rough surface, the abdomen was light gray, the external genitalia is slender tubular, the tip is sharp and free, straight up to the buttocks; female body is full, abdominal enlargement, Light body color, abdomen is white, external genitalia is round or oval, the end is not free, can not reach the hip base, ovarian porch is obvious, light pressure abdominal pressure out of the egg.
5. The tail of a female cricket is short and can not naturally extend out of the skirt. The tail length of the male can naturally extend out of the skirt; the female armor has a round oval shape, the middle is relatively flat, and the male's armor is Narrow and wide anterior long elliptic, middle uplift; female body is thicker, the abdomen is cross-shaped, the distance between the hind limbs is wider, the male body is thinner, the abdomen is curved jade shape, the distance between the hind limbs is narrow; mature male than female It is much larger and often twice as large as female.
6. The abdomen of the Chinese mitten crab is a triangle in the abdomen, commonly known as the pointed umbilicus, which fits tightly in the ventral foramen. The first section has a horizontal protrusion. This section is divided into two parts. The front part is inserted under the cephaloplasty and the posterior part. Bend to the abdomen, the second section is short and narrow, the third quarter is the widest; the female abdomen is wide and round, covering the entire chest plastron, commonly known as the round umbilical, the first and second sections are similar to the male crab, and the other sections are compared Large, the last section is small, but the width is greater than the length. The female has four pairs of abdominal limbs. It was born on the fifth abdominal section of the second section and gradually decreased from front to back. The male's abdominal limb had only two pairs of connectors and was born on the first and second abdomen sections. . The reproductive pores of the male and female individuals are located on the sternum of the chest, the male is in the seventh quarter and the female is in the fifth quarter.
Seven, viper snake male snake in the anus below 2 cm to 5 cm hiding a pair of sexual genitals (that is, snake whip), the tail thicker than the female snake; female snake tail from the anus to the end of the tail gradually smaller. Many male snakes are dim, unclear, and fierce and fierce, while female snakes are docile, bright-colored, and soft-touch. When the male snake is angry, his head shows a clear triangle; the female snake has a mostly oval head. Hold the viper's sexual identification zone by hand. There are male snakes that are exhaled by the transfer device, and female snakes are not.
1. Shrimp sexually matured green prawns, males are larger and stronger than females; males of sexually matured prawns are more powerful than females in the second step, usually 1.5 times longer than females; female prawns are fourth and fifth in ventral size. The distance between the bases of the step foot is wide, and it is arranged in an "eight" shape. The distance between the bases of the stepped males is relatively narrow, and there is a small protrusion on the inside of the bottom of the fifth step foot, which is the opening of the vas deferens. On the inner edge of the inner limb of the male second abdominal foot, there is a rod-shaped male appendage, whereas the female does not have this structure.
Second, turtle turtle individual large, short and thick trunk, the same age male small individual, thin and long trunk; female turtle shell is brownish yellow, male turtle shell is dark black; female tail short and thick, tail The base of the base is relatively small, the end of the soleplate is relatively straight, the inside is concave and shallow, the tail of the male is slender, the base of the tail is thick, the bottom is sharp and pointed, the concave is long and deep; the female turtle has no odor Males have special odors.
3. Within the same population of bullfrogs, male frogs grow rapidly and individuals are larger, while females have slower growth and smaller individuals; male frogs are dark brown in color and often have small warts. Female frogs have a smooth back and green; Frog tympanic membrane diameter than the eye, tympanic membrane and eye diameter ratio of 1:0.9, female frog tympanic membrane diameter slightly smaller than the eye, tympanic membrane and eye diameter ratio of 1:1.1; male frog thumb developed inside the mat, The reproductive season is particularly noticeable, while the female frog is non-married; the female frog's throat is gray-white and has no vocal sac, while the skin of the male frog's throat is golden yellow with a pair of ribbon-like cysts that can produce sounds.
Fourth, the main difference between male and female broodstock: leather male body elongated, rough surface, the abdomen was light gray, the external genitalia is slender tubular, the tip is sharp and free, straight up to the buttocks; female body is full, abdominal enlargement, Light body color, abdomen is white, external genitalia is round or oval, the end is not free, can not reach the hip base, ovarian porch is obvious, light pressure abdominal pressure out of the egg.
5. The tail of a female cricket is short and can not naturally extend out of the skirt. The tail length of the male can naturally extend out of the skirt; the female armor has a round oval shape, the middle is relatively flat, and the male's armor is Narrow and wide anterior long elliptic, middle uplift; female body is thicker, the abdomen is cross-shaped, the distance between the hind limbs is wider, the male body is thinner, the abdomen is curved jade shape, the distance between the hind limbs is narrow; mature male than female It is much larger and often twice as large as female.
6. The abdomen of the Chinese mitten crab is a triangle in the abdomen, commonly known as the pointed umbilicus, which fits tightly in the ventral foramen. The first section has a horizontal protrusion. This section is divided into two parts. The front part is inserted under the cephaloplasty and the posterior part. Bend to the abdomen, the second section is short and narrow, the third quarter is the widest; the female abdomen is wide and round, covering the entire chest plastron, commonly known as the round umbilical, the first and second sections are similar to the male crab, and the other sections are compared Large, the last section is small, but the width is greater than the length. The female has four pairs of abdominal limbs. It was born on the fifth abdominal section of the second section and gradually decreased from front to back. The male's abdominal limb had only two pairs of connectors and was born on the first and second abdomen sections. . The reproductive pores of the male and female individuals are located on the sternum of the chest, the male is in the seventh quarter and the female is in the fifth quarter.
Seven, viper snake male snake in the anus below 2 cm to 5 cm hiding a pair of sexual genitals (that is, snake whip), the tail thicker than the female snake; female snake tail from the anus to the end of the tail gradually smaller. Many male snakes are dim, unclear, and fierce and fierce, while female snakes are docile, bright-colored, and soft-touch. When the male snake is angry, his head shows a clear triangle; the female snake has a mostly oval head. Hold the viper's sexual identification zone by hand. There are male snakes that are exhaled by the transfer device, and female snakes are not.