The whitebait is a valuable small-scale economic fish that spawns in winter and breeds at a temperature of 0-0.8 degrees. The breeding technique is: Prepare 50 ml of 250 ml measuring cups, 250 ml, 500 ml each, 3 simple titration tubes, 5 suction cups, 5 tweezers, 5 scissors, and 2 thermometers. Branches, trays 4, scales 1, malachite green 50 grams, 20 kg of salt. A number of 14 cm X 20 cm fertilized bags were prepared, and the material was a 6-filament polyethylene film. A number of hatchery pools measuring 1.2 m X 2 m X 0.2 m were constructed. The hatchery was made of bricks, then covered with polyethylene film and the hatching pool was disinfected with 15% saline. The broodstock, the big whitebait, is generally sexually mature in the northern and southern regions in the middle of December and artificial insemination begins when the mature individuals reach 20%. The broodstock are caught, using a 1.8-2.2 cm mesh net, and the fishing area is generally a depth of about 2 meters in the bay, and the sediment is a gravel place.
Artificial insemination (1) Identification of male and female broodstock: Females, through their transparent abdomen, can see mature eggs arranged in the abdomen to expand, gently press the abdomen, and hatch outflow. The male fins are thick, with only one and smaller testis, located to the left of the back of the digestive tract, and a white vas deferens near the cloaca. Mature males have a red heart.
(2) Artificial Insemination: Dry the broodstock with a dry towel and put it in the tray. Take the insemination bag and fold it into a tube. Use the middle finger of the left hand, the ring finger and the little finger to hold the insemination bag. Then take the female, pick up the head with your left thumb and forefinger, grab the right thumb and the other four fingers, gently squeeze the female abdomen with your thumb, and squeeze the eggs into the fertilization bag. Then use your right hand to pour the male fish. The fish head points to the arm. The arm fin is separated from the fish egg by 1 cm. The lower part of the fish is parallel to the index finger. The thumb and the index finger are simultaneously pressed along the chest and abdomen to the breeding hole to squeeze out the semen. The fish is placed on the eggs. 30 ml 0.7% physiological saline was added to the fertilization bag, and the bag was grasped and shaken up and down to fully mix. Fill the insemination bag with air, then use a rubber band to tie it well and let it rest for 30 minutes. Then remove the male fish in the fertilized bag, and then add 100 ml of filtered water and let it sit in the hatching tank.
Temporary hatching and management of fertilized eggs (1) Add filtered water to the water depth in the hatchery pool to a depth of 5-7 cm, remove immature egg masses and impurities in the fertilized bags, and then place the fertilized eggs in the hatchery tank, with a density of 500,000. Grain/square meter.
(2) Using a straw to remove the dead eggs that were fertilized at the end of the morning.
(3) Change the filtered reservoir water by 1/2 to 2/3 every day. The water temperature difference should not exceed 1 degree.
(4) Two days later, eggs of malachite green or 2% salt water with a concentration of 0.1×10 6 were used for half an hour, and the amount of dead eggs at the end of fertilization was eliminated. The fertilized egg sinks quickly in the volume and is transparent and bright in the lower layer. Incubation usually takes about 7 days.
Artificial insemination (1) Identification of male and female broodstock: Females, through their transparent abdomen, can see mature eggs arranged in the abdomen to expand, gently press the abdomen, and hatch outflow. The male fins are thick, with only one and smaller testis, located to the left of the back of the digestive tract, and a white vas deferens near the cloaca. Mature males have a red heart.
(2) Artificial Insemination: Dry the broodstock with a dry towel and put it in the tray. Take the insemination bag and fold it into a tube. Use the middle finger of the left hand, the ring finger and the little finger to hold the insemination bag. Then take the female, pick up the head with your left thumb and forefinger, grab the right thumb and the other four fingers, gently squeeze the female abdomen with your thumb, and squeeze the eggs into the fertilization bag. Then use your right hand to pour the male fish. The fish head points to the arm. The arm fin is separated from the fish egg by 1 cm. The lower part of the fish is parallel to the index finger. The thumb and the index finger are simultaneously pressed along the chest and abdomen to the breeding hole to squeeze out the semen. The fish is placed on the eggs. 30 ml 0.7% physiological saline was added to the fertilization bag, and the bag was grasped and shaken up and down to fully mix. Fill the insemination bag with air, then use a rubber band to tie it well and let it rest for 30 minutes. Then remove the male fish in the fertilized bag, and then add 100 ml of filtered water and let it sit in the hatching tank.
Temporary hatching and management of fertilized eggs (1) Add filtered water to the water depth in the hatchery pool to a depth of 5-7 cm, remove immature egg masses and impurities in the fertilized bags, and then place the fertilized eggs in the hatchery tank, with a density of 500,000. Grain/square meter.
(2) Using a straw to remove the dead eggs that were fertilized at the end of the morning.
(3) Change the filtered reservoir water by 1/2 to 2/3 every day. The water temperature difference should not exceed 1 degree.
(4) Two days later, eggs of malachite green or 2% salt water with a concentration of 0.1×10 6 were used for half an hour, and the amount of dead eggs at the end of fertilization was eliminated. The fertilized egg sinks quickly in the volume and is transparent and bright in the lower layer. Incubation usually takes about 7 days.
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